The document discusses probing electroweak symmetry breaking with Higgs pair production at the LHC. It notes that double Higgs production allows reconstructing the full electroweak symmetry breaking potential and probing the Higgs self-interaction. While rates are small in the Standard Model, many BSM scenarios enhance double Higgs production. The document focuses on the challenging 4b final state, discussing multivariate analysis techniques that could help observe Higgs pair production in this channel at the HL-LHC.
Higgs pair production in vector-boson fusion at the LHC and beyondjuanrojochacon
The document discusses Higgs pair production, which can help uncover the mechanism of electroweak symmetry breaking. Double Higgs production allows reconstructing the full Higgs potential and probing the Higgs self-interaction. While production rates are small in the Standard Model, deviations from SM couplings could significantly increase rates. The document focuses on vector boson fusion channel, where requiring two forward jets and vetoing central jets can reduce backgrounds, and sensitivity to non-SM couplings improves at high di-Higgs invariant masses. Precision studies of Higgs pair production may reveal insights into electroweak symmetry breaking and new physics.
Boosting Strong Higgs Pair Production at the LHCjuanrojochacon
This document summarizes Juan Rojo's presentation on boosting strong Higgs pair production at the LHC. The key points are:
1) Higgs pair production allows for stringent tests of the understanding of electroweak symmetry breaking, but has low rates in the Standard Model.
2) Higgs pair production in vector boson fusion is small in the Standard Model but provides unique information on the hhVV coupling. It can be substantially enhanced in composite Higgs models.
3) Preliminary results show the hhVV coupling can be measured with 25-30% precision at the 14 TeV LHC with 300 fb-1, and 10-15% precision with 3000 fb-1, while the FCC could achieve
The impact of new collider data into the NNPDF global analysisJuan Rojo
The document summarizes Juan Rojo's presentation on the impact of new collider data in the NNPDF global analysis. It discusses updates and improvements to the NNPDF methodology, including adopting the public code APFEL, adding new LHC datasets like LHCb and top quark pair differential distributions, and analyzing the impact on parton distributions from including precise Tevatron and LHC Z boson data. Preliminary results from NNPDF3.1 indicate good stability compared to the previous NNPDF3.0 analysis, with reduced uncertainties and improved flavor separation from new experimental inputs.
Este documento habla sobre la enseñanza de la lectura y la escritura en el aula. Explica que es importante definir claramente el objetivo de enseñanza y crear un ambiente de aprendizaje propicio. También destaca la importancia de enseñar a los niños las formas correctas de escritura desde edades tempranas para ayudar a desarrollar sus habilidades.
El sonido se refiere a la propagación de ondas elásticas a través de un medio, generalmente involucrando la vibración de un cuerpo. El audio es la señal eléctrica o magnética proporcional a un sonido, generada por elementos como micrófonos y sujeta a procesamiento, almacenamiento y reproducción. El audio digital es la conversión de un sonido a datos digitales que pueden ser tratados como datos comunes pero representan el sonido original.
The document discusses building an explosive growth startup. It talks about PensionBee, the UK's leading online pension manager, which offers a pension solution for customers today. The presentation provides tips for starting small and scaling fast, including educating prospects, nurturing customers, creating an awesome product rather than focusing on tools like CRM, being data-driven and knowing how to code.
Nascer de novo: A Benção da ReencarnaçãoDarlan Araújo
O documento discute a doutrina da reencarnação, explicando seu significado e objetivos. A reencarnação é o retorno do espírito em um novo corpo para evoluir espiritualmente, sofrendo as consequências de ações passadas ou ajudando a humanidade. Jesus também fala sobre "nascer de novo" com Nicodemos, referindo-se à transformação espiritual através de vidas sucessivas.
Higgs pair production in vector-boson fusion at the LHC and beyondjuanrojochacon
The document discusses Higgs pair production, which can help uncover the mechanism of electroweak symmetry breaking. Double Higgs production allows reconstructing the full Higgs potential and probing the Higgs self-interaction. While production rates are small in the Standard Model, deviations from SM couplings could significantly increase rates. The document focuses on vector boson fusion channel, where requiring two forward jets and vetoing central jets can reduce backgrounds, and sensitivity to non-SM couplings improves at high di-Higgs invariant masses. Precision studies of Higgs pair production may reveal insights into electroweak symmetry breaking and new physics.
Boosting Strong Higgs Pair Production at the LHCjuanrojochacon
This document summarizes Juan Rojo's presentation on boosting strong Higgs pair production at the LHC. The key points are:
1) Higgs pair production allows for stringent tests of the understanding of electroweak symmetry breaking, but has low rates in the Standard Model.
2) Higgs pair production in vector boson fusion is small in the Standard Model but provides unique information on the hhVV coupling. It can be substantially enhanced in composite Higgs models.
3) Preliminary results show the hhVV coupling can be measured with 25-30% precision at the 14 TeV LHC with 300 fb-1, and 10-15% precision with 3000 fb-1, while the FCC could achieve
The impact of new collider data into the NNPDF global analysisJuan Rojo
The document summarizes Juan Rojo's presentation on the impact of new collider data in the NNPDF global analysis. It discusses updates and improvements to the NNPDF methodology, including adopting the public code APFEL, adding new LHC datasets like LHCb and top quark pair differential distributions, and analyzing the impact on parton distributions from including precise Tevatron and LHC Z boson data. Preliminary results from NNPDF3.1 indicate good stability compared to the previous NNPDF3.0 analysis, with reduced uncertainties and improved flavor separation from new experimental inputs.
Este documento habla sobre la enseñanza de la lectura y la escritura en el aula. Explica que es importante definir claramente el objetivo de enseñanza y crear un ambiente de aprendizaje propicio. También destaca la importancia de enseñar a los niños las formas correctas de escritura desde edades tempranas para ayudar a desarrollar sus habilidades.
El sonido se refiere a la propagación de ondas elásticas a través de un medio, generalmente involucrando la vibración de un cuerpo. El audio es la señal eléctrica o magnética proporcional a un sonido, generada por elementos como micrófonos y sujeta a procesamiento, almacenamiento y reproducción. El audio digital es la conversión de un sonido a datos digitales que pueden ser tratados como datos comunes pero representan el sonido original.
The document discusses building an explosive growth startup. It talks about PensionBee, the UK's leading online pension manager, which offers a pension solution for customers today. The presentation provides tips for starting small and scaling fast, including educating prospects, nurturing customers, creating an awesome product rather than focusing on tools like CRM, being data-driven and knowing how to code.
Nascer de novo: A Benção da ReencarnaçãoDarlan Araújo
O documento discute a doutrina da reencarnação, explicando seu significado e objetivos. A reencarnação é o retorno do espírito em um novo corpo para evoluir espiritualmente, sofrendo as consequências de ações passadas ou ajudando a humanidade. Jesus também fala sobre "nascer de novo" com Nicodemos, referindo-se à transformação espiritual através de vidas sucessivas.
Este documento describe la vida y costumbres de las tribus indígenas que habitaban las regiones inhospitalarias de América del Sur antes de la conquista española. Explica que las tribus no tenían un gobierno unificado y que cada una estaba gobernada por un cacique elegido por sus miembros. También describe sus prácticas religiosas basadas en el culto al sol, su lenguaje imperfecto, sus métodos de agricultura y ganadería, y sus hábitos de alimentación y vivienda en toldos.
Modul ini membahas tentang tujuan pembelajaran umum dan khusus, uraian materi, dan format penilaian melepaskan infus. Tujuan pembelajaran umum adalah agar mahasiswa dapat melepaskan infus sesuai prosedur, sedangkan tujuan khusus meliputi mereview konsep dasar, menyiapkan alat dan pasien, serta melepaskan infus sesuai prosedur."
This was a fast pitch deck to IT faculty (mostly MNSCU) and industry attendees at the New Directions in IT Education conference (http://advanceitmn.org/newdirections/). The message was that Agile methods are here to stay, there is solid theory behind them, and if we want to keep Minnesota relevant we need new approaches to IT curriculum. An "Agile Study Group" has been established, starting as a monthly book club to review Agile's theoretical foundations relevant to pedagogy.
Las comunicaciones entre el Río de la Plata y Chile a través de la cordillera
de los Andes —”Cordillera Nevada”, como era llamada por los españoles—
constituía un asunto que tenía gran significación política, económica y militar.
El tráfico entre Buenos Aires y el Pacífico se efectuaba a través de la
cordillera. Era más cómodo y menos costoso el viaje cruzando el macizo andino
que dar la vuelta por el extremo austral utilizando la vía marítima. Por esta
causa, la región de Cuyo tenía vital significación.
La llegada del ferrocarril, si bien no concluyó con los arreos, acortó las
distancias; bastaba con arrear hasta la estación más próxima y allí cargar la
hacienda en los vagones jaula del tren que estaban estacionados en el brete.
A mediados del siglo pasado aparecieron los camiones de transportar
hacienda, que van directamente y a cualquier día y hora a la puerta del
establecimiento donde se encuentra la hacienda que se desea transportar. Esto
concluyó con los arreos, con las tropas y con los troperos.
Ya no se ven pasar más por los caminos rurales las tropas en viaje, ni se oye
el grito de los troperos animando el arreo, ni el tañido de los cencerros de las
madrinas tropilleras que iban a la cabecera.
Hasta no hace muchas décadas, quienes
La llegada del ferrocarril, si bien no concluyó con los arreos, acortó las
distancias; bastaba con arrear hasta la estación más próxima y allí cargar la
hacienda en los vagones jaula del tren que estaban estacionados en el brete.
A mediados del siglo pasado aparecieron los camiones de transportar
hacienda, que van directamente y a cualquier día y hora a la puerta del
establecimiento donde se encuentra la hacienda que se desea transportar. Esto
concluyó con los arreos, con las tropas y con los troperos.
Ya no se ven pasar más por los caminos rurales las tropas en viaje, ni se oye
el grito de los troperos animando el arreo, ni el tañido de los cencerros de las
madrinas tropilleras que iban a la cabecera.
Hasta no hace muchas décadas, quienes
Este documento presenta la planeación de una lección de matemáticas para estudiantes de quinto grado. La lección se centra en la resolución de problemas que involucran la multiplicación de números decimales por números naturales. La lección comenzará con un juego de tiempo para practicar multiplicaciones decimales. Luego, los estudiantes trabajarán en equipos resolviendo problemas matemáticos que involucran la suma y multiplicación de decimales. La lección concluirá con una pregunta reflexiva sobre el uso de números decimales en la vida diaria.
Sachin Kumar Dubey is seeking a position utilizing his 3 years of experience in AD and messaging services in the IT sector. He has worked as an L2 administrator for AD and Exchange tickets, handling escalations and ensuring email security for 28,000 users. His skills include Windows Server, Exchange Server, PowerShell scripting, ITSM tools like BMC Remedy and ServiceNow, and ITIL processes. He is currently working for Wipro Technologies as an L2/L3 administrator for Takeda, where he has created scripts for health checks, handled incidents and defects, led an Exchange migration, and received several awards for his work.
Higgs Pair Production at the LHC and future collidersjuanrojochacon
Juan Rojo gave a seminar at Boston University Physics on November 26th, 2018 about Higgs pair production at the LHC and future colliders. He discussed how measuring Higgs pair production can provide insights into the Higgs sector and electroweak symmetry breaking. However, observing Higgs pair production is challenging due to small cross-sections in the standard model. Future colliders with higher energies, like the FCC, may enable more precise studies of Higgs pair production and help address open questions in particle physics.
Discovery through precision: perturbative QCD at the dawn of the LHC Run IIjuanrojochacon
This document summarizes a seminar given by Juan Rojo on perturbative QCD at the dawn of LHC Run II. In the seminar, Rojo discussed how recent advances in perturbative QCD, such as higher precision parton distribution functions and higher-order calculations, have improved the prospects for new physics searches at the LHC. Rojo also presented recent work on topics like PDFs with threshold resummation, Higgs pair production, and charm production that further push the boundaries of perturbative QCD and its applications at the LHC.
Pinning down the hhVV coupling from Higgs boson pair production in vector-b...juanrojochacon
The document discusses using Higgs boson pair production in vector-boson fusion (VBF) to probe the hhVV coupling. VBF Higgs pair production provides unique sensitivity to this coupling. While the standard model rate for VBF Higgs pair production is small, it can be substantially enhanced in composite Higgs models with new strong dynamics. Preliminary results indicate the hhVV coupling can be measured with 25-30% precision at the LHC with 300 fb-1, improving to 10-15% precision with 3000 fb-1. The FCC could determine the coupling with few-percent accuracy. Analyzing the boosted 4b and 2b2l final states allows probing deviations in the hhVV coupling growing with di-Higgs mass.
Parton Distributions and the search for New Physics at the LHCjuanrojochacon
Juan Rojo gave a seminar at King's College London on September 23, 2015 about parton distribution functions (PDFs) and their importance for precision physics at the Large Hadron Collider (LHC). PDFs describe the momentum distributions of quarks and gluons within protons and are crucial for determining cross sections and uncertainties for many LHC processes. The accurate determination of PDFs requires global analyses of experimental data using flexible parametrizations like neural networks to avoid biases. PDF uncertainties now limit characterization of the Higgs boson and searches for new physics at the LHC.
Strong Higgs Pair Production at the LHC with jet substructurejuanrojochacon
This document discusses strategies for measuring strong double Higgs boson production at the LHC and FCC to test models of electroweak symmetry breaking. In composite Higgs models, vector boson fusion Higgs pair production can be substantially enhanced compared to the Standard Model. Analyzing the di-Higgs mass distribution, especially in boosted topologies, provides the best sensitivity to deviations in Higgs self-couplings from Standard Model predictions. Preliminary results suggest the LHC could probe deviations in the hhVV coupling down to 20-50% depending on the final state, while the FCC could achieve even stronger constraints.
Probes of small-x QCD from HERA to the LHCJuan Rojo
This document discusses probes of small-x QCD physics from HERA to the LHC. It begins with an overview of parton distribution functions and the global analysis used to determine them. It then discusses various processes that are sensitive to the low-x gluon, such as direct photon and top quark production at the LHC. Forward charm production measured by LHCb is also highlighted as providing valuable constraints on the small-x gluon. The implications for modeling soft QCD processes and predicting neutrino fluxes are briefly mentioned.
Parton Distributions: future needs, and the role of the High-Luminosity LHCjuanrojochacon
1) Improved PDFs are needed to match the accuracy of higher-order calculations of cross sections and characterize properties of the Higgs boson and search for new physics.
2) The HL-LHC could significantly reduce PDF uncertainties through high-statistics measurements, especially in processes sensitive to large-x gluons and quarks like top quark pair production and Drell-Yan.
3) Preliminary studies generating HL-LHC pseudo-data show PDF uncertainties on the gluon-gluon and quark-antiquark luminosities could be reduced by 10-30% from top pair and Drell-Yan measurements respectively.
Characterizing New Physics with Polarized Beams in Hadron Collisionsjuanrojochacon
This document discusses how polarized proton beams could help characterize new physics discovered at the LHC or FCC. Polarized and unpolarized parton distribution functions have different behaviors, so cross sections with polarized beams would provide insights into couplings to different quark flavors. Single and double spin asymmetries could distinguish between new physics models that predict similar unpolarized signatures. While more study is needed, polarized beams could significantly aid understanding of the structure and couplings of any discovered heavy new particles.
Predrag Milenović "Physics potential of HE/HL-LHC and future circular"SEENET-MTP
The document discusses latest Higgs boson physics results from the LHC and prospects for physics performance at the HL-LHC. Key results presented include measurements of the Higgs boson mass, production cross sections and branching ratios using H→4l and H→γγ decay channels. Differential measurements are also shown. First direct evidence is reported for ttH production in multilepton final states with a significance of 3.3σ. The increased luminosity of the HL-LHC is expected to improve measurements and search sensitivity.
Este documento describe la vida y costumbres de las tribus indígenas que habitaban las regiones inhospitalarias de América del Sur antes de la conquista española. Explica que las tribus no tenían un gobierno unificado y que cada una estaba gobernada por un cacique elegido por sus miembros. También describe sus prácticas religiosas basadas en el culto al sol, su lenguaje imperfecto, sus métodos de agricultura y ganadería, y sus hábitos de alimentación y vivienda en toldos.
Modul ini membahas tentang tujuan pembelajaran umum dan khusus, uraian materi, dan format penilaian melepaskan infus. Tujuan pembelajaran umum adalah agar mahasiswa dapat melepaskan infus sesuai prosedur, sedangkan tujuan khusus meliputi mereview konsep dasar, menyiapkan alat dan pasien, serta melepaskan infus sesuai prosedur."
This was a fast pitch deck to IT faculty (mostly MNSCU) and industry attendees at the New Directions in IT Education conference (http://advanceitmn.org/newdirections/). The message was that Agile methods are here to stay, there is solid theory behind them, and if we want to keep Minnesota relevant we need new approaches to IT curriculum. An "Agile Study Group" has been established, starting as a monthly book club to review Agile's theoretical foundations relevant to pedagogy.
Las comunicaciones entre el Río de la Plata y Chile a través de la cordillera
de los Andes —”Cordillera Nevada”, como era llamada por los españoles—
constituía un asunto que tenía gran significación política, económica y militar.
El tráfico entre Buenos Aires y el Pacífico se efectuaba a través de la
cordillera. Era más cómodo y menos costoso el viaje cruzando el macizo andino
que dar la vuelta por el extremo austral utilizando la vía marítima. Por esta
causa, la región de Cuyo tenía vital significación.
La llegada del ferrocarril, si bien no concluyó con los arreos, acortó las
distancias; bastaba con arrear hasta la estación más próxima y allí cargar la
hacienda en los vagones jaula del tren que estaban estacionados en el brete.
A mediados del siglo pasado aparecieron los camiones de transportar
hacienda, que van directamente y a cualquier día y hora a la puerta del
establecimiento donde se encuentra la hacienda que se desea transportar. Esto
concluyó con los arreos, con las tropas y con los troperos.
Ya no se ven pasar más por los caminos rurales las tropas en viaje, ni se oye
el grito de los troperos animando el arreo, ni el tañido de los cencerros de las
madrinas tropilleras que iban a la cabecera.
Hasta no hace muchas décadas, quienes
La llegada del ferrocarril, si bien no concluyó con los arreos, acortó las
distancias; bastaba con arrear hasta la estación más próxima y allí cargar la
hacienda en los vagones jaula del tren que estaban estacionados en el brete.
A mediados del siglo pasado aparecieron los camiones de transportar
hacienda, que van directamente y a cualquier día y hora a la puerta del
establecimiento donde se encuentra la hacienda que se desea transportar. Esto
concluyó con los arreos, con las tropas y con los troperos.
Ya no se ven pasar más por los caminos rurales las tropas en viaje, ni se oye
el grito de los troperos animando el arreo, ni el tañido de los cencerros de las
madrinas tropilleras que iban a la cabecera.
Hasta no hace muchas décadas, quienes
Este documento presenta la planeación de una lección de matemáticas para estudiantes de quinto grado. La lección se centra en la resolución de problemas que involucran la multiplicación de números decimales por números naturales. La lección comenzará con un juego de tiempo para practicar multiplicaciones decimales. Luego, los estudiantes trabajarán en equipos resolviendo problemas matemáticos que involucran la suma y multiplicación de decimales. La lección concluirá con una pregunta reflexiva sobre el uso de números decimales en la vida diaria.
Sachin Kumar Dubey is seeking a position utilizing his 3 years of experience in AD and messaging services in the IT sector. He has worked as an L2 administrator for AD and Exchange tickets, handling escalations and ensuring email security for 28,000 users. His skills include Windows Server, Exchange Server, PowerShell scripting, ITSM tools like BMC Remedy and ServiceNow, and ITIL processes. He is currently working for Wipro Technologies as an L2/L3 administrator for Takeda, where he has created scripts for health checks, handled incidents and defects, led an Exchange migration, and received several awards for his work.
Higgs Pair Production at the LHC and future collidersjuanrojochacon
Juan Rojo gave a seminar at Boston University Physics on November 26th, 2018 about Higgs pair production at the LHC and future colliders. He discussed how measuring Higgs pair production can provide insights into the Higgs sector and electroweak symmetry breaking. However, observing Higgs pair production is challenging due to small cross-sections in the standard model. Future colliders with higher energies, like the FCC, may enable more precise studies of Higgs pair production and help address open questions in particle physics.
Discovery through precision: perturbative QCD at the dawn of the LHC Run IIjuanrojochacon
This document summarizes a seminar given by Juan Rojo on perturbative QCD at the dawn of LHC Run II. In the seminar, Rojo discussed how recent advances in perturbative QCD, such as higher precision parton distribution functions and higher-order calculations, have improved the prospects for new physics searches at the LHC. Rojo also presented recent work on topics like PDFs with threshold resummation, Higgs pair production, and charm production that further push the boundaries of perturbative QCD and its applications at the LHC.
Pinning down the hhVV coupling from Higgs boson pair production in vector-b...juanrojochacon
The document discusses using Higgs boson pair production in vector-boson fusion (VBF) to probe the hhVV coupling. VBF Higgs pair production provides unique sensitivity to this coupling. While the standard model rate for VBF Higgs pair production is small, it can be substantially enhanced in composite Higgs models with new strong dynamics. Preliminary results indicate the hhVV coupling can be measured with 25-30% precision at the LHC with 300 fb-1, improving to 10-15% precision with 3000 fb-1. The FCC could determine the coupling with few-percent accuracy. Analyzing the boosted 4b and 2b2l final states allows probing deviations in the hhVV coupling growing with di-Higgs mass.
Parton Distributions and the search for New Physics at the LHCjuanrojochacon
Juan Rojo gave a seminar at King's College London on September 23, 2015 about parton distribution functions (PDFs) and their importance for precision physics at the Large Hadron Collider (LHC). PDFs describe the momentum distributions of quarks and gluons within protons and are crucial for determining cross sections and uncertainties for many LHC processes. The accurate determination of PDFs requires global analyses of experimental data using flexible parametrizations like neural networks to avoid biases. PDF uncertainties now limit characterization of the Higgs boson and searches for new physics at the LHC.
Strong Higgs Pair Production at the LHC with jet substructurejuanrojochacon
This document discusses strategies for measuring strong double Higgs boson production at the LHC and FCC to test models of electroweak symmetry breaking. In composite Higgs models, vector boson fusion Higgs pair production can be substantially enhanced compared to the Standard Model. Analyzing the di-Higgs mass distribution, especially in boosted topologies, provides the best sensitivity to deviations in Higgs self-couplings from Standard Model predictions. Preliminary results suggest the LHC could probe deviations in the hhVV coupling down to 20-50% depending on the final state, while the FCC could achieve even stronger constraints.
Probes of small-x QCD from HERA to the LHCJuan Rojo
This document discusses probes of small-x QCD physics from HERA to the LHC. It begins with an overview of parton distribution functions and the global analysis used to determine them. It then discusses various processes that are sensitive to the low-x gluon, such as direct photon and top quark production at the LHC. Forward charm production measured by LHCb is also highlighted as providing valuable constraints on the small-x gluon. The implications for modeling soft QCD processes and predicting neutrino fluxes are briefly mentioned.
Parton Distributions: future needs, and the role of the High-Luminosity LHCjuanrojochacon
1) Improved PDFs are needed to match the accuracy of higher-order calculations of cross sections and characterize properties of the Higgs boson and search for new physics.
2) The HL-LHC could significantly reduce PDF uncertainties through high-statistics measurements, especially in processes sensitive to large-x gluons and quarks like top quark pair production and Drell-Yan.
3) Preliminary studies generating HL-LHC pseudo-data show PDF uncertainties on the gluon-gluon and quark-antiquark luminosities could be reduced by 10-30% from top pair and Drell-Yan measurements respectively.
Characterizing New Physics with Polarized Beams in Hadron Collisionsjuanrojochacon
This document discusses how polarized proton beams could help characterize new physics discovered at the LHC or FCC. Polarized and unpolarized parton distribution functions have different behaviors, so cross sections with polarized beams would provide insights into couplings to different quark flavors. Single and double spin asymmetries could distinguish between new physics models that predict similar unpolarized signatures. While more study is needed, polarized beams could significantly aid understanding of the structure and couplings of any discovered heavy new particles.
Predrag Milenović "Physics potential of HE/HL-LHC and future circular"SEENET-MTP
The document discusses latest Higgs boson physics results from the LHC and prospects for physics performance at the HL-LHC. Key results presented include measurements of the Higgs boson mass, production cross sections and branching ratios using H→4l and H→γγ decay channels. Differential measurements are also shown. First direct evidence is reported for ttH production in multilepton final states with a significance of 3.3σ. The increased luminosity of the HL-LHC is expected to improve measurements and search sensitivity.
The Structure of the Proton in the Higgs Boson Erajuanrojochacon
Juan Rojo gave a seminar at NIKHEF in Amsterdam on January 22, 2015 about the structure of the proton in the Higgs boson era. He discussed how the discovery of the Higgs boson completed the Standard Model but also opened new questions. He explained that the Large Hadron Collider will play a key role in exploring these questions over the next 20 years. Accurately determining the parton distribution functions of the proton is vital for phenomenology at the LHC.
Precision determination of the small-x gluon from charm production at LHCbjuanrojochacon
This document discusses using LHCb data on charm production to constrain the small-x gluon and improve predictions for neutrino fluxes. LHCb data at 7 TeV, 5 TeV and 13 TeV provides stringent constraints on the small-x gluon beyond HERA. This improved gluon allows more accurate predictions for signals and backgrounds at neutrino telescopes. At a 100 TeV collider, inclusive cross sections depend directly on small-x PDFs, but using LHCb data leads to stabilized predictions with reduced uncertainties.
The structure of the proton in the Higgs boson erajuanrojochacon
Juan Rojo gave a seminar at SLAC on July 4th, 2015 about the structure of the proton in the Higgs boson era and the role of the Large Hadron Collider. He discussed how the discovery of the Higgs boson completed the Standard Model but also opened new questions. Determining the parton distribution functions of protons with precision is important for phenomenology at the LHC, such as characterizing Higgs couplings and searching for new physics. Over the next 20 years, the LHC will play a key role in exploring these open questions.
淺嚐 LHCb 數據分析的滋味 Play around the LHCb Data on Kaggle with SK-Learn and MatPlotLibYuan CHAO
LHC實驗是現今粒子物理實驗的最先端,2012年所發現的希格斯粒子更是物理界的一大盛事。繼Atlas實驗在Kaggle公開Higgs挑戰之後,另一個LHC的LHCb實驗也將實驗數據搬上了Kaggle平台。本講題將簡介背後的實驗,並使用LHCb的數據以SciKit-Learn進行多維度數據分析與使用MatPlotLib視覺化。
Play around the LHCb Data on Kaggle with SK-Learn and MatPlotLib
Search for microscopic black hole signatures at the large hadron colliderSérgio Sacani
The CMS Collaboration at the LHC searched for microscopic black hole signatures using 35 pb-1 of 7 TeV proton-proton collision data. No significant excess beyond standard model expectations was observed in events with high total transverse energy. Limits are set on the minimum black hole mass in the range of 3.5-4.5 TeV for various parameters in the large extra dimensions model. These are the first direct limits on black hole production at a particle collider.
This document discusses a thesis project that aims to evaluate the radiation hardness of sensor materials for use in the proposed International Linear Collider beamline calorimeter (BeamCal). The author performs Monte Carlo simulations to estimate the shower conversion factor α, which quantifies the mean radiation fluence at a sensor per incident electron, as a function of electron energy. Analysis of the simulation data provides fluence distribution profiles that decrease radially from the center of the irradiated sensor area. The author accounts for sensor rastering across the electron beam, which provides even illumination over a 2 cm area. Observations from the simulations indicate the radiation fluence is linearly dependent on the incident electron energy.
The Standard Model and the LHC in the Higgs Boson Erajuanrojochacon
The document discusses the Standard Model of particle physics and the role of the Large Hadron Collider (LHC) following the discovery of the Higgs boson. It provides background on the development of the Standard Model and discovery of its key particles like quarks, gluons, and weak bosons. It describes the LHC as the most powerful particle collider built to explore physics at the highest energies and probe unanswered questions left by the Standard Model. Four main detectors at the LHC, including ATLAS and CMS, precisely measure collision products to explore fundamental particles and forces.
The Physics of Gas Sloshing in Galaxy ClustersJohn ZuHone
1) The document discusses gas sloshing in galaxy clusters, which occurs when cool core gas is uplifted from the gravitational potential minimum and forms a contact discontinuity with hotter, less dense gas.
2) Simulations of galaxy cluster mergers show that interactions with subclusters can cause gas sloshing by accelerating the gas and dark matter components differently.
3) Observations reveal spiral-shaped cold fronts in galaxy clusters that are evidence of gas sloshing. Magnetic fields may stabilize these fronts by being draped across the interfaces.
Большие данные в физике элементарных частиц на примере LHCb - Guy Wilkinson, ...Yandex
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Probing electroweak symmetry breaking with Higgs pair production at the LHC
1. Probing electroweak symmetry breaking !
with Higgs pair production at the LHC
Juan Rojo!
VU Amsterdam & Theory group, Nikhef!
!
!
Cosmology, Particle Physics and Phenomenology (CP3)!
Université Catholique de Louvain (UCL)!
15/11/2016
Juan Rojo CP3 seminar, UCL, 15/11/2016
2. !
!
!
!
!
!
Fingerprinting the Higgs sector
!
In the Standard Model the properties of the Higgs sector are uniquely determined !
Any deviation from the tight SM predictions would be a smoking gun for Physics beyond the SM!
!
This precision required both in experimental data and in theory calculations of Higgs production
A precision of a few percent in Higgs couplings measurements is the goal!
3. 3
EW symmetry breaking: what do we know
Yukawa/Couplings between
Higgs and SM particles
proportional to mass!
The Higgs boson is
responsible to break EW
symmetry and give particles
mass!
However, we still lack
understanding of why and
how EWS is broken !
What are the dynamics
underlying EW symmetry
breaking?
Juan Rojo CP3 seminar, UCL, 15/11/2016
4. 4
Higgs Pair Production at the LHC
Double Higgs production allows accessing crucial components of the Higgs sector:!
Reconstruct the full electroweak symmetry breaking potential!
Probe the Higgs self-interaction!
Probe the doublet nature of the Higgs by means of the hhVV coupling!
In the SM, hh rates are small: in the leading gluon-fusion production mode, the cross-section at 14 TeV
is only 40 fb, further suppressed by branching fractions
5. 5
Higgs Pair Production at the LHC
Double Higgs production allows accessing crucial components of the Higgs sector:!
Reconstruct the full electroweak symmetry breaking potential!
Probe the Higgs self-interaction!
Probe the doublet nature of the Higgs by means of the hhVV coupling!
In the SM, hh rates are small: in the leading gluon-fusion production mode, the cross-section at 14 TeV
is only 40 fb, further suppressed by branching fractions
6. Each possibility associated to completely different EWSB mechanism, with crucial implications for the
hierarchy problem, the structure of quantum field theory, and New Physics at the EW scale
Current measurements (couplings in single Higgs production) probe Higgs potential close to minimum!
Double Higgs production essential to reconstruct the full Higgs potential and clarify EWSB mechanism!
The Higgs potential is ad-hoc: many other EWSB mechanisms conceivable
6
Higgs mechanism Coleman-Weinberg mechanism
single h prod double h prod
Arkani-Hamed, Han, Mangano, Wang, arxiv:1511.06495
EW symmetry breaking: what we don’t know
Juan Rojo CP3 seminar, UCL, 15/11/2016
7. Current measurements (couplings in single Higgs production) probe Higgs potential close to minimum!
Double Higgs production essential to reconstruct the full Higgs potential and clarify EWSB mechanism!
The Higgs potential is ad-hoc: many other EWSB mechanisms conceivable
7
EW symmetry breaking: what we don’t know
~
Juan Rojo CP3 seminar, UCL, 15/11/2016
8. 8
Higgs Pair Production at the LHC
Double Higgs production allows accessing crucial components of the Higgs sector:!
Reconstruct the full electroweak symmetry breaking potential!
Probe the Higgs self-interaction!
Probe the doublet nature of the Higgs by means of the hhVV coupling!
In the SM, hh rates are small: in the leading gluon-fusion production mode, the cross-section at 14 TeV
is only 40 fb, further suppressed by branching fractions!
Rates for double Higgs production generically enhanced in BSM scenarios, and LHC searches in
various final states have already started at Run I
9. 9
Higgs Pair Production at the LHC
Double Higgs production allows accessing crucial components of the Higgs sector:!
Reconstruct the full electroweak symmetry breaking potential!
Probe the Higgs self-interaction!
Probe the doublet nature of the Higgs by means of the hhVV coupling!
In the SM, hh rates are small: in the leading gluon-fusion production mode, the cross-section at 14 TeV
is only 40 fb, further suppressed by branching fractions!
Rates for double Higgs production generically enhanced in BSM scenarios, and LHC searches in
various final states have already started at Run I
Important contributions !
to this plot from !
the CP3 CMS group!
10. Higgs pair production by gluon-fusion !
in the 4b final state!
M. Gouzevitch, A. Oliveira, J. Rojo, R. Rosenfeld, G. P. Salam
and V. Sanz, JHEP 1307, 148 (2013), arXiv:1303.6636!
J. K. Behr, D. Bortoletto, J. A. Frost, N. P. Hartland, C. Issever
and J. Rojo, EPJC76, no. 7, 386 (2016), arXiv:1512.08928
Juan Rojo CP3 seminar, UCL, 15/11/2016
11. 11
Focus on the hh->4b final state: largest rates, but overwhelming QCD multijet backgrounds!
Made competitive requiring the di-Higgs system to be boosted and exploiting kinematic differences
between signal and QCD background with jet substructure!
Mandatory to optimize the boosted b-tagging techniques, recent progress by ATLAS and CMS!
Boosted b-tagging by ghost-associating mass-drop tagged large-R jets with b-tagged small-R jets!
Tagging these events is changeling due to the very high rate of QCD multijets, but doable!
Scale-invariant tagging: event-by-event classification depending on final state topology
Higgs pair production in the 4b channel
Juan Rojo CP3 seminar, UCL, 15/11/2016
13. 13
BoostedResolved
!
Made competitive requiring the di-Higgs system to be boosted and exploiting kinematic differences
between signal and QCD background with jet substructure!
Mandatory to optimize the boosted b-tagging techniques, recent progress by ATLAS and CMS
Juan Rojo CP3 seminar, UCL, 15/11/2016
Higgs pair production in the 4b channel
16. Assume HL-LHC integrated luminosity of L=3000 fb-1!
At the end of the cut-based analysis (level C2) backgrounds still still overwhelmingly larger than the
signal, and signal significances very low!
Use MVA to fully exploit the kinematic discrimination power between signal and background events
16
Cut-based analysis results
Accurate treatment of b-jet fakes from light and charm jets crucial for this final state
Juan Rojo CP3 seminar, UCL, 15/11/2016
17. 17
Multivariate techniques
Large number of kinematic variables to disentangle signal and background, how to combine them?!
Multivariate techniques: Identify automatically kinematical variables with most discrimination power
Artificial Neural Network!
Trained on MC eventsHiggs pT!
Higgs m!
di-Higgs m!
ECF!
𝛕12!
Subjet pT!
…..
Juan Rojo CP3 seminar, UCL, 15/11/2016
18. 18
Multivariate techniques
Given a set of Nvar kinematic variables {ki} associated to MC event i, and a set of ANN weight parameters
{ω}, the ANN output yi interpreted as probability that this event originates from signal process!
With y’i the true MC classification: y’i=1 for signal, y’i=0 for background!
The general classification probability including background events is !
Thus the error function to be minimised during the training is the cross-entropy: !
ANN training performed with Genetic Algorithms using cross-validation stopping
Juan Rojo CP3 seminar, UCL, 15/11/2016
19. Substructure variables quantify differences in internal structure between QCD jets and jets from the decay
of heavy resonances!
QCD radiation tends to be soft and collinear, while decay products of resonances share momentum evenly
19
Jet substructure variables
Energy Correlation Functions ratio 𝛕21: 2-to-1 Subjettiness ratio
Juan Rojo CP3 seminar, UCL, 15/11/2016
20. 20
Multivariate techniques
Combining information from all kinematic variables in MVA: excellent signal/background discrimination
Background !
rejected
Signal !
accepted
Juan Rojo CP3 seminar, UCL, 15/11/2016
21. Use of multivariate techniques allows to substantially improve the signal significance for this process
as compared to a traditional cut -based analysis!
The total combined significance is enough to observe Higgs pair production in the 4b final state at the
HL-LHC. Substantial improvement if reducible backgrounds (fakes) can be eliminated
21
Signal significance
Pre-MVA resultJuan Rojo CP3 seminar, UCL, 15/11/2016
22. 22
Opening the Black Box
ANNs are sometimes criticised by acting as black boxes, with little control/understanding of what is
happening inside them!
But ANNs are simply a set of combined kinematical cuts, nothing mysterious in them!
To verify this, plot kin distributions after and before the ANN cut: we can then determine the effective
kinematic cuts are being optimised by the MVA!
This info should be enough to perform a cut-based analysis and achieve similar signal significance
Juan Rojo CP3 seminar, UCL, 15/11/2016
23. ANNs are sometimes criticised by acting as black boxes, with little control/understanding of what is
happening inside them!
But ANNs are simply a set of combined kinematical cuts, nothing mysterious in them!
To verify this, plot kin distributions after and before the ANN cut: we can then determine the effective
kinematic cuts are being optimised by the MVA!
This info should be enough to perform a cut-based analysis and achieve similar signal significance
23
Opening the Black Box
Juan Rojo Christmas Meeting ICC-UB, 22/12/2015
The background “Higgs mass peak” !
now mimics the signal one!
24. !
!
Now working on estimating the accuracy on the extraction of the Higgs self-coupling that can be
achieved at the LHC Run II, the HL-LHC and at a 100 TeV FCC!
Need to carefully estimate the systematic uncertainties that affect the measurement of the fiducial cross-
section, which ultimately determines how precisely the self-coupling can be determined
Juan Rojo CP3 seminar, UCL, 15/11/2016
Higgs Self-Coupling Sensitivity – My New Case Study
Çiğdem İşsever
HIGGSSELFCOUPLING
5
Expected Sensitivity for the case 𝛌/𝛌 𝐒𝐌= 1 with S/B = 5%, 230 fb-1
Syst. Error on
Background
5% 2.5% 1.25%
λ ∈ [0 , 5] ∗ λ [0.4 , 2.3] ∗ λ [0.5,1.5] ∗ λ
Resolved, 14 TeV
χ2
𝝀/𝝀 𝑺𝑴 𝝀/𝝀 𝑺𝑴 𝝀/𝝀 𝑺𝑴
LHC 13 TeV, Resolved Category
Behr et al, in
preparation
Towards a measurement of λ
25. !
!
Now working on estimating the accuracy on the extraction of the Higgs self-coupling that can be
achieved at the LHC Run II, the HL-LHC and at a 100 TeV FCC!
Need to carefully estimate the systematic uncertainties that affect the measurement of the fiducial
cross-section, which ultimately determines how precisely the self-coupling can be determined
Towards a measurement of λ
Juan Rojo CP3 seminar, UCL, 15/11/2016
Higgs Self-Coupling Sensitivity – My New Case Study
Çiğdem İşsever
HIGGSSELFCOUPLING
6
Expected Sensitivity for the case 𝛌/𝛌 𝐒𝐌= 1 with S/B = 5%, 230 fb-1
Syst. Error on
Background
5% 2.5% 1.25%
𝛌/𝛌 𝐒𝐌 ∈ > −0.4 [−0.2 , 2.3] [0.0,2.0]
Intermediate, 14 TeV
𝝀/𝝀 𝑺𝑴 𝝀/𝝀 𝑺𝑴 𝝀/𝝀 𝑺𝑴
χ2
LHC 13 TeV, Boosted Category
Behr et al, in
preparation
26. !
!
Now working on estimating the accuracy on the extraction of the Higgs self-coupling that can be
achieved at the LHC Run II, the HL-LHC and at a 100 TeV FCC!
Need to carefully estimate the systematic uncertainties that affect the measurement of the fiducial
cross-section, which ultimately determines how precisely the self-coupling can be determined
Towards a measurement of λ
Juan Rojo CP3 seminar, UCL, 15/11/2016
Higgs Self-Coupling Sensitivity – My New Case Study
Çiğdem İşsever
HIGGSSELFCOUPLING
6
Expected Sensitivity for the case 𝛌/𝛌 𝐒𝐌= 1 with S/B = 5%, 230 fb-1
Syst. Error on
Background
5% 2.5% 1.25%
𝛌/𝛌 𝐒𝐌 ∈ > −0.4 [−0.2 , 2.3] [0.0,2.0]
Intermediate, 14 TeV
𝝀/𝝀 𝑺𝑴 𝝀/𝝀 𝑺𝑴 𝝀/𝝀 𝑺𝑴
χ2
Behr et al, in
preparation
Competitive constraints on the Higgs self-coupling can be imposed already at Run II,
provided systematic uncertainties of the 4b cross-section can be kept under control
Take-away !
message
27. Higgs pair production by vector-boson
fusion in the 4b final state!
F. Bishara, R. Contino and J. Rojo, arxiv:1611.03860
Juan Rojo CP3 seminar, UCL, 15/11/2016
28. Is this cancellation exact (as in SM, c2V= cV
2) or only approximate (BSM, c2V ≠ cV
2 )?!
No model-independent information on c2V available so far at the LHC!
Even for small deviation of the SM couplings, striking signals within the reach of Run II!
In the absence of the Higgs boson, the amplitude for vector-boson scattering (VBS) grows with the partonic
center-of-mass energy, until eventually unitarity is violated!
In the SM, the Higgs boson unitarizes the high-energy behaviour of VBS amplitudes
28
EW symmetry breaking: what we don’t know
at high energies
~ ~ ~
Juan Rojo CP3 seminar, UCL, 15/11/2016
29. In the absence of the Higgs boson, the amplitude for vector-boson scattering (VBS) grows with the partonic
center-of-mass energy, until eventually unitarity is violated!
In the SM, the Higgs boson unitarizes the high-energy behaviour of VBS amplitudes
29
EW symmetry breaking: what we don’t know
at high energies
Juan Rojo CP3 seminar, UCL, 15/11/2016
!
On the other hand, VBF
production has very
little sensitivity to the
Higgs self-coupling …
30. Exploiting the VBF channel for di-Higgs
!
!
Signal generation with MadGraph5 using customized UFO model!
Event rates can increase by up to a factor 30 as compared to SM if new physics is present!
At a 100 TeV collider, 105 events before cuts even for SM couplings
Juan Rojo CP3 seminar, UCL, 15/11/2016
31. Exploiting the VBF channel for di-Higgs
Generation of QCD multijet backgrounds highly CPU time-intensive!
Generated at LO with Sherpa (weighted and unweighted events), cross-checked with ALGEN!
Gluon-fusion di-Higgs production now background to VBF production!
The irreducible 4b multijet background is seven orders of magnitude larger than the SM signal at the
generation level. How to overcome this huge difference?
Juan Rojo CP3 seminar, UCL, 15/11/2016
32. Killing backgrounds with VBF topology
The huge QCD jet backgrounds can be reduced by exploiting the VBF topology!
Require two forward jets, separated in rapidity, plus a veto in hadronic activity in the central region!
Additional cuts in the reconstructed Higgs invariant mass and the di-Higgs invariant mass mhh further
reduce the QCD multijet cross-sections!
Dijet rapidity separation cut Central jet veto cut
Juan Rojo CP3 seminar, UCL, 15/11/2016
33. Scale-invariant Tagging
!
!
Same strategy as that used for the analysis of the gluon-fusion channel!
Determine, event-by-event, degree of boost of di-Higgs system and optimise selection accordingly!
!
Juan Rojo CP3 seminar, UCL, 15/11/2016
34. Scale-invariant Tagging
In the SM, resolved selection dominates, but for BSM couplings, boosted topology important
BSM
Juan Rojo CP3 seminar, UCL, 15/11/2016
35. LHC 14 TeV
0.5 0.7 1 2 5
mhh [TeV]
10 6
10 4
10 2
1
102
d/dmhh[fb/bin]
SM
c2V = 0.8
Background
FCC 100 TeV
1 2 5 10 20
mhh [TeV]
10 6
10 4
10 2
1
102
104
d/dmhh[fb/bin]
SM
c2V = 0.8
Background
Figure 11. The di-Higgs mhh distribution at 14 TeV (left) and 100 TeV (right) after all analysis
cuts showing the results for the signal (SM and c2V = 0.8) and for the total background.
¯Juan Rojo HPP meeting, 30/09/2016
Probing the high-energy regime
After selection and analysis cuts, backgrounds are still overwhelmingly large for mhh close to threshold!
For BSM couplings, the ratio of cross-sections between BSM and SM increases dramatically as we probe
the regions of large mhh, eventually dominating over backgrounds!
This is the key of the sensitivity to c2V despite the tiny SM cross-sections
BSM signal (c2V=0.8 benchmark point) dominates over background
36. Background decomposition
!
!
!
At 14 TeV, contribution from reducible 2b2j multijet backgrounds (mistagged light jets) dominate up
to mhh ~800 GeV, when the irreducible 4b background becomes the most important!
Same trend at 100 TeV, with now gg>hh becoming dominant at highest invariant masses, mhh ~8 TeV!
Reliability of QCD multijet background estimation has been carefully validated with two
independent MC generators, Sherpa and ALPGEN
Juan Rojo CP3 seminar, UCL, 15/11/2016
37. Sensitivity to the hhVV coupling
Searches for di-Higgs production in the vector-boson-fusion channel should start
already during Run II, without waiting for the HL-LHC!
Take-away !
message
The sensitivity to c2V improves significantly the higher the values of mhh that can be probed!
In the absence of new resonances, c2V can be constrained down to 45% (20%) of its SM value at the 1-sigma level
at the LHC (HL-LHC), assuming SM couplings!
Juan Rojo CP3 seminar, UCL, 15/11/2016
38. !
!
Higgs pair production is a cornerstone of the LHC program for the coming years, allowing us to
reconstruct the EWSB potential and to test the nature of the EWSB mechanism!
The 4b final state offers the highest yields, but requires clever analysis techniques for taming the
overwhelming QCD background, both theoretically and experimentally!
In the gluon-fusion channel, discovery is guaranteed at the HL-LHC, and competitive constraints
on the self-coupling can be imposed already at Run II, provided systematic uncertainties of the 4b
cross-section can be kept under control!
In the VBF channel, the steep rise of the cross-section with the di-Higgs invariant mass in the case
of deviations from the SM couplings is the key for the high sensitivity of this process to c2V!
For such complex final sates like 4b, the ultimate signal optimization of the extraction of the Higgs
couplings requires the use of machine learning methods such as Multivariate Analysis
The di-Higgs frontier at the LHC
Juan Rojo CP3 seminar, UCL, 15/11/2016
Higgs pair production holds unique potential!
to uncover BSM dynamics at the LHC!
Take-away !
message
39. !
!
Higgs pair production is a cornerstone of the LHC program for the coming years, allowing us to
reconstruct the EWSB potential and to test the nature of the EWSB mechanism!
The 4b final state offers the highest yields, but requires clever analysis techniques for taming the
overwhelming QCD background, both theoretically and experimentally!
In the gluon-fusion channel, discovery is guaranteed at the HL-LHC, and competitive constraints
on the self-coupling can be imposed already at Run II, provided systematic uncertainties of the 4b
cross-section can be kept under control!
In the VBF channel, the steep rise of the cross-section with the di-Higgs invariant mass in the case
of deviations from the SM couplings is the key for the high sensitivity of this process to c2V!
For such complex final sates like 4b, the ultimate signal optimization of the extraction of the Higgs
couplings requires the use of machine learning methods such as Multivariate Analysis
The di-Higgs frontier at the LHC
Juan Rojo CP3 seminar, UCL, 15/11/2016
Higgs pair production holds unique potential!
to uncover BSM dynamics at the LHC!
Take-away !
message
Thanks for your attention!