Juan Rojo presented a study on including top-quark pair differential distributions in NNLO global PDF fits. The distributions provide stringent constraints on the large-x gluon, comparable to inclusive jet data. Fitting normalized distributions and including one distribution from ATLAS and CMS improves the description of data and reduces PDF uncertainties, particularly at high masses important for BSM searches. Some tension is seen between ATLAS and CMS measurements that can be reduced by fitting the experiments separately. Differential top data will be essential for future global PDF fits.
The document discusses the NNPDF3.1 global analysis of parton distribution functions (PDFs). It provides an update to NNPDF3.0 motivated by new high-precision collider data and progress in NNLO calculations. NNPDF3.1 fits both a perturbative and fitted charm PDF and finds slightly better fit quality for the fitted charm case. Comparisons to NNPDF3.0 show agreement within uncertainties and reduced PDF errors in NNPDF3.1 due to the new LHC data.
Neural Network Fits of Parton DistributionsJuan Rojo
ย
The document discusses neural network fits of parton distribution functions (PDFs). It describes the NNPDF approach, which uses artificial neural networks as universal interpolators to parametrize PDFs without theoretical bias, in contrast to traditional approaches. The NNPDF method also uses a Monte Carlo replica method to estimate PDF uncertainties without linear approximations. Recent NNPDF results include determinations of PDFs including quantum electrodynamics corrections and an investigation of the intrinsic charm content of the proton.
โuโu Multi-Tenanted Framework: Distributed Near Duplicate Detection for Big DataPradeeban Kathiravelu, Ph.D.
ย
Near duplicate detection algorithms have been proposed and implemented in order to detect and eliminate duplicate entries from massive datasets. Due to the differences in data representation (such as measurement units) across different data sources, potential duplicates may not be textually identical, even though they refer to the same real-world entity. As data warehouses typically contain data coming from several heterogeneous data sources, detecting near duplicates in a data warehouse requires a considerable memory and processing power.
Traditionally, near duplicate detection algorithms are sequential and operate on a single computer. While parallel and distributed frameworks have recently been exploited in scaling the existing algorithms to operate over larger datasets, they are often focused on distributing a few chosen algorithms using frameworks such as MapReduce. A common distribution strategy and framework to parallelize the execution of the existing similarity join algorithms is still lacking.
In-Memory Data Grids (IMDG) offer a distributed storage and execution, giving the illusion of a single large computer over multiple computing nodes in a cluster. This paper presents the research, design, and implementation of โuโu, a distributed near duplicate detection framework, with preliminary evaluations measuring its performance and achieved speed up. โuโu leverages the distributed shared memory and execution model provided by IMDG to execute existing near duplicate detection algorithms in a parallel and multi-tenanted environment. As a unified near duplicate detection framework for big data, โuโu efficiently distributes the algorithms over utility computers in research labs and private clouds and grids.
This document discusses indexing techniques for scalable record linkage and deduplication. It introduces the problems of record linkage on large datasets that do not fit in memory and addresses corrupted data. Blocking is presented as a common approach, where similar records are grouped into blocks to reduce the number of record pairs that must be compared. The document also discusses research on developing machine learning techniques to automatically learn optimal blocking keys and blocking functions. Evaluation frameworks for record linkage are introduced. The sorted neighborhood method is described in detail, including how it creates keys, sorts data, and merges records to link them.
Lรญdia Guerreiro Jorge nasceu em Boliqueime, Algarve em 1946. Formou-se em Filologia Romรขnica pela Universidade de Lisboa e publicou seu primeiro romance, O Dia dos Prodรญgios, em 1980. Ela lecionou no ensino secundรกrio e recebeu vรกrios prรชmios literรกrios.
The document discusses the NNPDF3.1 global analysis of parton distribution functions (PDFs). It provides an update to NNPDF3.0 motivated by new high-precision collider data and progress in NNLO calculations. NNPDF3.1 fits both a perturbative and fitted charm PDF and finds slightly better fit quality for the fitted charm case. Comparisons to NNPDF3.0 show agreement within uncertainties and reduced PDF errors in NNPDF3.1 due to the new LHC data.
Neural Network Fits of Parton DistributionsJuan Rojo
ย
The document discusses neural network fits of parton distribution functions (PDFs). It describes the NNPDF approach, which uses artificial neural networks as universal interpolators to parametrize PDFs without theoretical bias, in contrast to traditional approaches. The NNPDF method also uses a Monte Carlo replica method to estimate PDF uncertainties without linear approximations. Recent NNPDF results include determinations of PDFs including quantum electrodynamics corrections and an investigation of the intrinsic charm content of the proton.
โuโu Multi-Tenanted Framework: Distributed Near Duplicate Detection for Big DataPradeeban Kathiravelu, Ph.D.
ย
Near duplicate detection algorithms have been proposed and implemented in order to detect and eliminate duplicate entries from massive datasets. Due to the differences in data representation (such as measurement units) across different data sources, potential duplicates may not be textually identical, even though they refer to the same real-world entity. As data warehouses typically contain data coming from several heterogeneous data sources, detecting near duplicates in a data warehouse requires a considerable memory and processing power.
Traditionally, near duplicate detection algorithms are sequential and operate on a single computer. While parallel and distributed frameworks have recently been exploited in scaling the existing algorithms to operate over larger datasets, they are often focused on distributing a few chosen algorithms using frameworks such as MapReduce. A common distribution strategy and framework to parallelize the execution of the existing similarity join algorithms is still lacking.
In-Memory Data Grids (IMDG) offer a distributed storage and execution, giving the illusion of a single large computer over multiple computing nodes in a cluster. This paper presents the research, design, and implementation of โuโu, a distributed near duplicate detection framework, with preliminary evaluations measuring its performance and achieved speed up. โuโu leverages the distributed shared memory and execution model provided by IMDG to execute existing near duplicate detection algorithms in a parallel and multi-tenanted environment. As a unified near duplicate detection framework for big data, โuโu efficiently distributes the algorithms over utility computers in research labs and private clouds and grids.
This document discusses indexing techniques for scalable record linkage and deduplication. It introduces the problems of record linkage on large datasets that do not fit in memory and addresses corrupted data. Blocking is presented as a common approach, where similar records are grouped into blocks to reduce the number of record pairs that must be compared. The document also discusses research on developing machine learning techniques to automatically learn optimal blocking keys and blocking functions. Evaluation frameworks for record linkage are introduced. The sorted neighborhood method is described in detail, including how it creates keys, sorts data, and merges records to link them.
Lรญdia Guerreiro Jorge nasceu em Boliqueime, Algarve em 1946. Formou-se em Filologia Romรขnica pela Universidade de Lisboa e publicou seu primeiro romance, O Dia dos Prodรญgios, em 1980. Ela lecionou no ensino secundรกrio e recebeu vรกrios prรชmios literรกrios.
Este documento presenta informaciรณn sobre la poblaciรณn mundial y conceptos demogrรกficos. Explica que la poblaciรณn mundial alcanzรณ los 7200 millones de personas en 2013 y se estima que llegarรก a 9500 millones en 2050. Tambiรฉn introduce conceptos como demografรญa, pirรกmides poblaciones, densidad poblacional y componentes que estudian los cambios demogrรกficos como natalidad, mortalidad y migraciones.
Este documento presenta un taller prรกctico sobre 10 claves para la implementaciรณn de tendencias y enfoques innovadores en la educaciรณn. El taller busca que los docentes identifiquen el cambio necesario para incorporar las TIC al aula y currรญculo escolar. El taller se desarrolla a travรฉs de ejercicios que exploran nuevas habilidades docentes, polรญticas de acceso a TIC, y desafรญos para la educaciรณn del siglo 21.
La ley establece el marco legal para el sistema educativo federal en Argentina. Define los derechos y responsabilidades del Estado nacional, las provincias y la ciudad de Buenos Aires en cuanto a la educaciรณn. Establece la estructura del sistema educativo, incluyendo la educaciรณn inicial, bรกsica, polimodal, superior y cuaternaria. Tambiรฉn garantiza la gratuidad de la educaciรณn pรบblica en todos los niveles y otorga becas para estudiantes en situaciรณn de vulnerabilidad socioeconรณmica.
The iPad Pro comes in two screen sizes, a 12.9-inch model with the highest resolution of any iOS device and a 9.7-inch model with an advanced screen that is bright with minimal reflections. Both models have powerful A9X chips that provide over 1.8 times faster performance than the iPad Air 2, powerful speakers, and support for the Apple Pencil and Smart Keyboard accessories. The iPad Pro is aimed at professional users by providing computer-like power and functionality in a portable device without compromising the tablet experience.
The document discusses the benefits of exercise for mental health. Regular physical activity can help reduce anxiety and depression and improve mood and cognitive function. Exercise causes chemical changes in the brain that may help protect against developing mental illness and improve symptoms for those who already suffer from conditions like anxiety and depression.
O documento descreve a histรณria e programaรงรฃo da SIC e TVI, os dois principais canais privados de televisรฃo em Portugal. A SIC foi o primeiro canal privado e lรญder de audiรชncias em 2005, enquanto a TVI pertenceu ร Igreja Catรณlica atรฉ 1993. As duas emissoras competem por audiรชncias com novelas, talk shows e reality shows, e apesar da "rivalidade", possuem programaรงรฃo semelhante.
El documento describe los pasos para completar un ejercicio de investigaciรณn bibliogrรกfica sobre el tratamiento de infecciones de heridas quirรบrgicas. Se buscaron artรญculos en Cinahl usando tรฉrminos de Decs como "tratamiento", "infecciรณn", "herida" y "cesรกrea". Se seleccionaron 5 artรญculos y se exportaron a Refworks para generar una bibliografรญa siguiendo las reglas de Vancouver. Se accediรณ al texto completo de 2 de los artรญculos a travรฉs de enlaces en Cinahl o en la pรกgina
Este documento presenta el calendario de reuniones de las Academias Regionales para profesores de secundaria en Ixtlรกn, Nayarit. Detalla las fechas de octubre de 2011 en las que se llevarรกn a cabo reuniones sobre diferentes asignaturas acadรฉmicas como matemรกticas, espaรฑol, ciencias, educaciรณn fรญsica, geografรญa e historia. Todas las reuniones se realizarรกn en la Escuela "Ramรณn Corona" de Ixtlรกn y tendrรกn una duraciรณn de 8 de la maรฑana a 2 de
Un proceso se puede entender informalmente como un programa en ejecuciรณn. Formalmente, es una unidad de actividad caracterizada por la ejecuciรณn de una secuencia de instrucciones, un estado actual y recursos asociados. Los procesos se ejecutan de cuatro maneras: al iniciar el sistema, mediante llamadas de un proceso a otro, por peticiones del usuario o por trabajos por lotes. Un proceso finaliza por salida normal, error, error fatal o al ser eliminado por otro proceso. Los estados de un proceso son: ejecuciรณn, bloqueado
Hangouts es una herramienta de Google que permite videollamadas y conversaciones entre usuarios. Se puede usar para reuniones de trabajo virtuales donde los miembros del equipo pueden compartir pantalla y resolver dudas sin necesidad de reunirse en persona. Tambiรฉn es รบtil para dar conferencias de forma remota. Se argumenta que Hangouts podrรญa tener un impacto positivo en el รกmbito laboral y otros campos al facilitar la comunicaciรณn y colaboraciรณn a distancia.
Este documento describe el fenรณmeno de la urbanizaciรณn y las ciudades. Explica que actualmente mรกs del 75% de la poblaciรณn de los paรญses desarrollados vive en ciudades, frente al 40% de los paรญses en desarrollo. Tambiรฉn describe tres etapas de la explosiรณn urbana, los diferentes tipos de ciudades como metrรณpolis y capitales, y los modelos de ciudad compacta y difusa.
The impact of new collider data into the NNPDF global analysisJuan Rojo
ย
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.
Statistical issues in global fits: Lessons from PDF determinationsJuan Rojo
ย
The document discusses statistical issues that arise in global fits to determine parton distribution functions (PDFs) from experimental data. It notes that PDF fits must combine data from different collision types and experiments, which can have inconsistent measurements. Traditional PDF fitting methods make restrictive assumptions that introduce bias, while the NNPDF approach uses neural networks and Monte Carlo replicas to avoid biases and faithfully represent uncertainties, including in regions with limited data. Inconsistent data poses challenges and requires delicate handling in global fits to obtain statistically sound PDF results.
Este documento presenta informaciรณn sobre la poblaciรณn mundial y conceptos demogrรกficos. Explica que la poblaciรณn mundial alcanzรณ los 7200 millones de personas en 2013 y se estima que llegarรก a 9500 millones en 2050. Tambiรฉn introduce conceptos como demografรญa, pirรกmides poblaciones, densidad poblacional y componentes que estudian los cambios demogrรกficos como natalidad, mortalidad y migraciones.
Este documento presenta un taller prรกctico sobre 10 claves para la implementaciรณn de tendencias y enfoques innovadores en la educaciรณn. El taller busca que los docentes identifiquen el cambio necesario para incorporar las TIC al aula y currรญculo escolar. El taller se desarrolla a travรฉs de ejercicios que exploran nuevas habilidades docentes, polรญticas de acceso a TIC, y desafรญos para la educaciรณn del siglo 21.
La ley establece el marco legal para el sistema educativo federal en Argentina. Define los derechos y responsabilidades del Estado nacional, las provincias y la ciudad de Buenos Aires en cuanto a la educaciรณn. Establece la estructura del sistema educativo, incluyendo la educaciรณn inicial, bรกsica, polimodal, superior y cuaternaria. Tambiรฉn garantiza la gratuidad de la educaciรณn pรบblica en todos los niveles y otorga becas para estudiantes en situaciรณn de vulnerabilidad socioeconรณmica.
The iPad Pro comes in two screen sizes, a 12.9-inch model with the highest resolution of any iOS device and a 9.7-inch model with an advanced screen that is bright with minimal reflections. Both models have powerful A9X chips that provide over 1.8 times faster performance than the iPad Air 2, powerful speakers, and support for the Apple Pencil and Smart Keyboard accessories. The iPad Pro is aimed at professional users by providing computer-like power and functionality in a portable device without compromising the tablet experience.
The document discusses the benefits of exercise for mental health. Regular physical activity can help reduce anxiety and depression and improve mood and cognitive function. Exercise causes chemical changes in the brain that may help protect against developing mental illness and improve symptoms for those who already suffer from conditions like anxiety and depression.
O documento descreve a histรณria e programaรงรฃo da SIC e TVI, os dois principais canais privados de televisรฃo em Portugal. A SIC foi o primeiro canal privado e lรญder de audiรชncias em 2005, enquanto a TVI pertenceu ร Igreja Catรณlica atรฉ 1993. As duas emissoras competem por audiรชncias com novelas, talk shows e reality shows, e apesar da "rivalidade", possuem programaรงรฃo semelhante.
El documento describe los pasos para completar un ejercicio de investigaciรณn bibliogrรกfica sobre el tratamiento de infecciones de heridas quirรบrgicas. Se buscaron artรญculos en Cinahl usando tรฉrminos de Decs como "tratamiento", "infecciรณn", "herida" y "cesรกrea". Se seleccionaron 5 artรญculos y se exportaron a Refworks para generar una bibliografรญa siguiendo las reglas de Vancouver. Se accediรณ al texto completo de 2 de los artรญculos a travรฉs de enlaces en Cinahl o en la pรกgina
Este documento presenta el calendario de reuniones de las Academias Regionales para profesores de secundaria en Ixtlรกn, Nayarit. Detalla las fechas de octubre de 2011 en las que se llevarรกn a cabo reuniones sobre diferentes asignaturas acadรฉmicas como matemรกticas, espaรฑol, ciencias, educaciรณn fรญsica, geografรญa e historia. Todas las reuniones se realizarรกn en la Escuela "Ramรณn Corona" de Ixtlรกn y tendrรกn una duraciรณn de 8 de la maรฑana a 2 de
Un proceso se puede entender informalmente como un programa en ejecuciรณn. Formalmente, es una unidad de actividad caracterizada por la ejecuciรณn de una secuencia de instrucciones, un estado actual y recursos asociados. Los procesos se ejecutan de cuatro maneras: al iniciar el sistema, mediante llamadas de un proceso a otro, por peticiones del usuario o por trabajos por lotes. Un proceso finaliza por salida normal, error, error fatal o al ser eliminado por otro proceso. Los estados de un proceso son: ejecuciรณn, bloqueado
Hangouts es una herramienta de Google que permite videollamadas y conversaciones entre usuarios. Se puede usar para reuniones de trabajo virtuales donde los miembros del equipo pueden compartir pantalla y resolver dudas sin necesidad de reunirse en persona. Tambiรฉn es รบtil para dar conferencias de forma remota. Se argumenta que Hangouts podrรญa tener un impacto positivo en el รกmbito laboral y otros campos al facilitar la comunicaciรณn y colaboraciรณn a distancia.
Este documento describe el fenรณmeno de la urbanizaciรณn y las ciudades. Explica que actualmente mรกs del 75% de la poblaciรณn de los paรญses desarrollados vive en ciudades, frente al 40% de los paรญses en desarrollo. Tambiรฉn describe tres etapas de la explosiรณn urbana, los diferentes tipos de ciudades como metrรณpolis y capitales, y los modelos de ciudad compacta y difusa.
The impact of new collider data into the NNPDF global analysisJuan Rojo
ย
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.
Statistical issues in global fits: Lessons from PDF determinationsJuan Rojo
ย
The document discusses statistical issues that arise in global fits to determine parton distribution functions (PDFs) from experimental data. It notes that PDF fits must combine data from different collision types and experiments, which can have inconsistent measurements. Traditional PDF fitting methods make restrictive assumptions that introduce bias, while the NNPDF approach uses neural networks and Monte Carlo replicas to avoid biases and faithfully represent uncertainties, including in regions with limited data. Inconsistent data poses challenges and requires delicate handling in global fits to obtain statistically sound PDF results.
PDFs at the LHC: Lessons from Run I and preparation for Run IIjuanrojochacon
ย
This document summarizes parton distribution functions (PDFs) at the start of LHC Run II. It discusses the status of recent PDF sets from NNPDF, MMHT, CT, ABM, and HERAPDF. It notes some differences between these sets and the importance of PDF uncertainties for LHC measurements. The document also discusses benchmarks between PDF sets, comparisons using the APFEL online tool, and the prospects for including more ATLAS data in global PDF fits to further constrain PDFs.
Parton Distributions: future needs, and the role of the High-Luminosity LHCjuanrojochacon
ย
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.
NNPDF3.0: Next Generation Parton Distributions for the LHC Run IIjuanrojochacon
ย
NNPDF3.0 is a new PDF release from the NNPDF collaboration that incorporates recent experimental data from HERA and the LHC, improved theory calculations, and methodological advances. Key aspects of NNPDF3.0 include the inclusion of new data like HERA structure functions, LHC jets and electroweak data, and top quark production data. It also utilizes approximate NNLO calculations for jets and NLO electroweak corrections for Drell-Yan production. The fitting methodology has been improved with a C++ rewrite of the code and validation on closure tests. Preliminary results show good agreement with NNPDF2.3 and reduced uncertainties for some PDFs from the new data and methodology
Constraints on the gluon PDF from top quark differential distributions at NNLOjuanrojochacon
ย
- The document discusses constraints on the gluon PDF from top quark production at hadron colliders.
- It describes using the inclusive top quark pair production cross section to reduce uncertainties in the gluon PDF, especially in the large-x region between 0.1 and 0.5.
- Cross section ratios between different beam energies, such as 8 TeV/7 TeV, are highlighted as powerful precision tests that can discriminate between PDFs and probe BSM physics.
Parton Distributions and Standard Model Physics at the LHCjuanrojochacon
ย
This document discusses parton distribution functions (PDFs) and recent developments. It notes that NNLO calculations are essential to reduce uncertainties in PDF analysis. Several key processes like inclusive jet production and top quark production are now available at NNLO. The document also discusses the inclusion of LHC data like W+charm, top quark, and jet data in global PDF fits. It highlights updates to various PDF fitting groups and the upcoming NNPDF3.0 release.
The document summarizes the NNPDF3.1 global analysis which provides an updated determination of parton distribution functions (PDFs) from experimental data. Key points include:
1) NNPDF3.1 includes new high-precision measurements from the LHC as well as NNLO QCD calculations, allowing more data to be included. It also fits the charm PDF rather than assuming it is purely perturbative.
2) The new data provides stronger constraints on PDFs, particularly the gluon and down quark, significantly reducing their uncertainties. It also shows good agreement with the previous NNPDF3.0 analysis.
3) For the first time, NNPDF3.1 includes LHC
News from NNPDF: new data and fits with intrinsic charmjuanrojochacon
ย
Juan Rojo presented recent work by the NNPDF collaboration including: 1) inclusion of the final HERA legacy dataset which provides a moderate reduction in PDF uncertainties, 2) inclusion of new LHC data which constrains the large-x gluon PDF, and 3) ongoing work to perform fits with intrinsic charm and investigate implications for LHC phenomenology.
Parton distributions in the LHC precision erajuanrojochacon
ย
This document summarizes Juan Rojo's presentation on parton distribution functions (PDFs) at the Zurich Phenomenology Workshop 2018. The key points are:
1) PDF fits require combining perturbative cross-sections calculated using the Standard Model Lagrangian with non-perturbative PDFs extracted from a global analysis of experimental data.
2) More precise PDFs are needed to reduce uncertainties on calculations of processes like Higgs production and measurements of its couplings at the LHC.
3) Recent PDF analyses have included new data like differential top quark production from LHC and NNLO calculations, improving determinations of the gluon PDF over a wide range of x values.
4) Small-x data
Recent progress in proton and nuclear PDFs at small-xjuanrojochacon
ย
1) The document discusses recent progress in proton and nuclear parton distribution functions (PDFs) at small values of x. PDFs describe the momentum distribution of quarks and gluons inside protons and nuclei.
2) Global analyses of experimental data from various processes are used to determine PDFs at hadronic scales, which are then evolved perturbatively to higher scales relevant for LHC predictions. Recent analyses include data from the LHC.
3) Probing PDFs at small x requires processes dominated by gluons at leading order, produced in the forward region with low invariant masses. Examples discussed are direct photon and charm production. LHCb and future forward calorimeter data provide constraints on the small-
The document summarizes progress in the NNPDF global analysis of parton distribution functions. It discusses past NNPDF analyses from 2012-2015 and plans for future analyses, including NNPDF3.1 which will include new LHC data and improve the determination of intrinsic charm. It also presents results from fits allowing the charm content of the proton to be determined from data rather than assumed from perturbation theory, finding the data support a small intrinsic charm component within uncertainties.
PDF uncertainties and the W mass: Report from the Workshop โParton Distributi...juanrojochacon
ย
The document summarizes discussions from a workshop about reducing uncertainties in parton distribution functions (PDFs) that affect measurements of the W boson mass. Key topics discussed included issues modeling the Z boson's transverse momentum, inconsistencies between PDF sets, and the need for additional LHC measurements like of W/Z production to reduce PDF uncertainties in future W mass measurements to below 10 MeV. Participants agreed more work is needed to understand differences between PDF sets and include relevant LHC data in global fits.
NNPDF3.0: Next generation parton distributions for the LHC Run IIjuanrojochacon
ย
The document provides an overview of the forthcoming NNPDF3.0 PDF release from the NNPDF Collaboration. Key points include:
1) NNPDF3.0 includes over 1000 new data points from HERA and LHC experiments like ATLAS and CMS, improving constraints on PDFs.
2) Improved theory calculations are used, including approximate NNLO corrections for jet data and full NLO electroweak corrections.
3) The NNPDF methodology has been upgraded with a C++ code rewrite, validation on closure tests, and improvements to the fitting strategy and basis choices.
PDF uncertainties the LHC made easy: a compression algorithm for the combinat...juanrojochacon
ย
This document summarizes Juan Rojo's presentation on a new method for combining PDF sets called compressed Monte Carlo PDFs (CMC-PDFs). The method involves combining Monte Carlo replicas from different PDF sets, then compressing the large combined set into a smaller set that still accurately reproduces properties like uncertainties. Validation shows CMC-PDFs with only 25 replicas can reproduce uncertainties for a variety of LHC processes, providing a computationally efficient implementation of the PDF4LHC recommendation.
Parton Distributions at a 100 TeV Hadron Colliderjuanrojochacon
ย
Usage of modern PDF sets with LHAPDF6 v6.1.5 is suitable for FCC studies and simulations. At a 100 TeV hadron collider, PDFs would need to be evaluated in more extreme regions of small-x, large-x, and large invariant masses than at the LHC. Photon-initiated processes could contribute significantly at the FCC due to large uncertainties in the photon PDF. Heavy quark PDFs, including for the top quark, should be included in matched calculations for FCC simulations rather than using a purely massless scheme.
Parton Distributions and the search for New Physics at the LHCjuanrojochacon
ย
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.
Parton distributions from high-precision collider datajuanrojochacon
ย
Juan Rojo gave a seminar at the Technical University of Munich on July 13, 2017 about parton distributions from high-precision collider data. He discussed how parton distribution functions are essential for calculating cross sections at hadron colliders like the LHC, since they describe the probability of finding quarks and gluons within protons. Rojo explained that global analyses fit PDFs to diverse experimental data using statistical techniques like neural networks, and the PDFs can then provide predictions for new processes. He highlighted recent updates from the NNPDF collaboration in version 3.1 to include more precise LHC data and the option to fit the charm quark distribution.
NNPDF3.0: parton distributions for the LHC Run IIjuanrojochacon
ย
NNPDF3.0 is a new PDF determination that includes updated data and theory improvements compared to NNPDF2.3. It includes all HERA-II data and new LHC measurements. The fitting code was rewritten in C++ and validated using closure tests. NNPDF3.0 shows reasonable agreement with NNPDF2.3 while improving descriptions of data and reducing uncertainties in some regions. It provides PDFs for use at the LHC Run II.
This document discusses parton distribution functions (PDFs) with intrinsic charm. It presents the motivation for fitting a charm PDF in global analyses, including stabilizing charm mass dependence, quantifying the non-perturbative charm component, and exploring implications for LHC phenomenology. The document summarizes previous fits allowing for intrinsic charm and issues they faced. It then presents new NNPDF fits that allow the charm PDF to be fitted, finding these fits describe EMC charm data and have stable gluon and charm PDFs under charm mass variations, with implications for precision LHC calculations.
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๐๐ข๐ฌ๐๐ฎ๐ฌ๐ฌ ๐ญ๐ก๐ ๐๐๐ ๐๐ฎ๐ซ๐ซ๐ข๐๐ฎ๐ฅ๐ฎ๐ฆ ๐ข๐ง ๐ญ๐ก๐ ๐๐ก๐ข๐ฅ๐ข๐ฉ๐ฉ๐ข๐ง๐๐ฌ:
- Understand the goals and objectives of the Edukasyong Pantahanan at Pangkabuhayan (EPP) curriculum, recognizing its importance in fostering practical life skills and values among students. Students will also be able to identify the key components and subjects covered, such as agriculture, home economics, industrial arts, and information and communication technology.
๐๐ฑ๐ฉ๐ฅ๐๐ข๐ง ๐ญ๐ก๐ ๐๐๐ญ๐ฎ๐ซ๐ ๐๐ง๐ ๐๐๐จ๐ฉ๐ ๐จ๐ ๐๐ง ๐๐ง๐ญ๐ซ๐๐ฉ๐ซ๐๐ง๐๐ฎ๐ซ:
-Define entrepreneurship, distinguishing it from general business activities by emphasizing its focus on innovation, risk-taking, and value creation. Students will describe the characteristics and traits of successful entrepreneurs, including their roles and responsibilities, and discuss the broader economic and social impacts of entrepreneurial activities on both local and global scales.
How to Download & Install Module From the Odoo App Store in Odoo 17Celine George
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How to Manage Reception Report in Odoo 17Celine George
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NNLO PDF fits with top-quark pair differential distributions
1. NNLO PDF ๏ฌts with !
top-quark pair differential distributions
Juan Rojo!
VU Amsterdam & Theory group, Nikhef!
!
Based on arxiv:1611.aaaaa, !
with M. Czakon, N. P. Hartland, A. Mitov, and E. R. Nocera!
!
with many thanks for assistance and discussions to M. Aldaya, F. Deliot, A. Gianmanco, !
R. Gonzalez, A. Lister, A. Meyer, M. Owen, P. Silva, F. Spano, โฆ!
!
LHC Top Working Group meeting!
CERN, 21/11/2016
Juan Rojo LHC Top Working group meeting, 21/09/2016
1
2. 2
!
Total cross-sections already used in many PDF ๏ฌts, using
differential measurements will only increase constraining power!
NNLO calculation for stable top quarks available, together
with scale optimization, allows for the use of state-of-the art
theory for top data in global PDF ๏ฌts!
Available precise data from ATLAS and CMS at 8 TeV with
full breakdown of statistical and systematic uncertainties!
Study interplay with inclusive jet production measurements
(NNLO calculation very recently completed)
Why top-pair differential data in PDF ๏ฌts?
Juan Rojo LHC Top Working group meeting, 21/09/2016
Czakon, Mangano, Mitov, Rojo 13
ABM12MMHT14
3. 3
PDF ๏ฌt settings
Juan Rojo LHC Top Working group meeting, 21/09/2016
!
Based on the NNPDF3 global analysis framework!
Baseline ๏ฌt based on the same dataset as in NNPDF3.0, except for:!
Separate H1 and ZEUS data from HERA-II replaced by ๏ฌnal HERA combination!
Jet data excluded (since NNLO for inclusive jets only very recently available)!
NNLO theory, with ฮฑS(mZ) =0.118, mtop=173.3 GeV, mcharm =1.51 GeV, mbottom=4.92 GeV!
Optimized choice of factorization and renormalization scales
!
Fast NLO calculations based on Sherpa/MCgrid, supplemented by bin-by-bin NNLO/NLO K-factors!
All available sources of statistical and systematic correlated uncertainties accounted for
For pt
T!
For yt,ytt, mtt!
Czakon,Heines, Mitov 16
NNPDF Collaboration 14-16
Currie, Glover, Pires 16
4. 4
Top-pair differential distributions
Juan Rojo LHC Top Working group meeting, 21/09/2016
!
Focus on the lepton+jets
8 TeV data from ATLAS
and CMS (no technical
limitations to include other
differential measurements)!
ATLAS arXiv:1511.04716!
CMS arXiv:1505.04480!
!
Fit either absolute or
normalized distributions
(in the latter case adding
total cross-sections) and
compare results!
Statistical correlations
between distributions
unknown: can only include
one distribution per
experiment in the PDF ๏ฌt
5. 5
NNLO corrections
Juan Rojo LHC Top Working group meeting, 21/09/2016
!
For the top and top-pair
rapidity, K-factors are roughly ๏ฌat
with size between 1.06 and 1.08!
For pt
T, K-factor decreases from
1.1 at low pt
T to 1 at high pt
T!
For mtt , K-factor is al large as
1.12 above 1 TeV!
K-factors independent of the
input PDFs used in their
calculation, to good approximation
6. 6
Sensitivity to the large-x gluon
Juan Rojo LHC Top Working group meeting, 21/09/2016
!
The correlation coef๏ฌcient between the gluon PDF and each of the bins of the four kinematic
distributions determines the region of Bjorken-x where available data has sensitivity!
Large values, ๐ โฅ 0.8, of the correlation for 0.07 < x < 0.6, representing a signi๏ฌcant improved over the
coverage in x of inclusive cross-section measurements
๐ = 0.8
๐ = 0.8
8. 8
NNLO theory confronts LHC data
Juan Rojo LHC Top Working group meeting, 21/09/2016
!
Normalized distributions, of course, exhibit much smaller experimental uncertainties!
However, the size of the ATLAS and CMS uncertainties can differ by substantial amounts!
Specially in then normalized case, results not always consistent between the two experiments
9. 9
NNLO theory confronts LHC data
Juan Rojo LHC Top Working group meeting, 21/09/2016
!
At the qualitative level, NNPDF3.0, MMHT14, CT14 and HERAPDF2.0 reasonable
agreement with the data (but need to compute ๐2/Ndat for a quantitative assessment)!
Larger differences are found for ABM12, both for absolute (systematic undershooting) as
well as for normalized distributions
11. 11
NNLO theory confronts LHC data
Juan Rojo LHC Top Working group meeting, 21/09/2016
!
For mtt , exp uncertainties similar between abs and norm distributions at large masses!
In the highest bin, ATLAS uncertainty 4 times larger than the CMS one!
Again, for some bins the measurements from the two experiments are not really consistent
13. 13
๐2/Ndat for the NNLO global ๏ฌts
Juan Rojo LHC Top Working group meeting, 21/09/2016
!
Entries in boldface indicate the datasets included in each speci๏ฌc ๏ฌt
14. 14
๐2/Ndat for the NNLO global ๏ฌts
Juan Rojo LHC Top Working group meeting, 21/09/2016
!
Poor ๐2/Ndat for some distributions improved when ATLAS and CMS data are ๏ฌtted separately
Fitting separately!
ATLAS and CMS data
1.1
2.6
1.8
4.1
15. 15
๐2/Ndat for the NNLO global ๏ฌts
Juan Rojo LHC Top Working group meeting, 21/09/2016
Fitting separately!
ATLAS and CMS data
1.1
2.6
1.8
4.1
Fitting separately!
ATLAS and CMS data
0.8
0.6
1.7
0.9
!
in a HERA-only ๏ฌt
!
Further improvement of data/theory agreement when ATLAS and CMS data added separately on top
of a HERA-only ๏ฌt: discard possible internal inconsistencies or limitations of NNLO QCD theory
16. 16
Impact on the large-x gluon
Juan Rojo LHC Top Working group meeting, 21/09/2016
Absolute Normalized
17. 17
Which top-quark differential data to ๏ฌt?
Juan Rojo LHC Top Working group meeting, 21/09/2016
Our recommendation for the 8 TeV lepton+jets differential distributions:
!
Fit normalized distributions, which exhibit somewhat enhanced constraining power!
Among these, select the distributions with which lead to larger reduction of PDF uncertainties!
Require good agreement between data and theory, ๐2/Ndat ~ 1, to avoid distorting the ๏ฌt in the
case of (still not understood) tensions between ATLAS and CMS!
Include one kinematic distribution from ATLAS and a different one from CMS, to achieve
better kinematical coverage on the gluon PDF
!
Other possible choices, within the above guidelines, would lead to consistent results, since the pull
on the large-x gluon is similar for all the ATLAS and CMS distributions (even when ๐2/Ndat ยป 1)
18. 18
Impact on the large-x gluon
Juan Rojo LHC Top Working group meeting, 21/09/2016
!
Signi๏ฌcant reduction of PDF uncertainties in the gluon-gluon luminosity at high invariant masses!
For instance, for MX=2 TeV, the PDF uncertainties decrease from 13% to 5%!
Remarkably, the constraints from top differential data in the global ๏ฌt are comparable to those from
inclusive jets, despite coming from much fewer data points: Ndat =17 for top vs Ndat =470 for jets
MX=2 TeV
19. 19
Impact on differential distributions
Juan Rojo LHC Top Working group meeting, 21/09/2016
none of the LHC data showed in these plots has been used in the PDF ๏ฌt
20. 20
Impact on differential distributions
Juan Rojo LHC Top Working group meeting, 21/09/2016
!
PDF uncertainties reduced by more than a factor
two for mtt > 650 GeV!
Similar improvements for gluon-driven
processes, either SM or BSM, at high masses!
Self-consistent program to use top data to
provide improved theory predictions!
Our choice of ๏ฌtted distributions (yt and ytt)
reduce the risk of BSM contamination (kinematical
suppression of heavy resonances) which can show
up instead in the tails of the mtt and pt
T distributions
(whose PDF uncertainties are now greatly reduced)
Improved sensitivity to BSM physics !
with top-quark ๏ฌnal states
21. 21 Juan Rojo LHC Top Working group meeting, 21/09/2016
Summary and outlook!
Differential distributions from top-quark pair
production provide stringent constraints on the large-x
gluon, comparable to those from inclusive jet production!
The possibility to ๏ฌt some distributions (yt and ytt) and
use the results to provide updated predictions for others
(pt
T and mtt) leads to a signi๏ฌcant reduction of theory
uncertainties with minimal risk of BSM contamination!
Some distributions exhibit a tension between the
ATLAS and CMS measurements. The quality of the data
description is signi๏ฌcantly improved if the two
experiments are ๏ฌtted separately!
Further comparisons using other ๏ฌnal states, 13 TeV
data and particle-level distributions should shed more
light on the origin of these tensions!
Differential top quark measurements will be an essential ingredient !
for the next generation of global PDF ๏ฌts!
22. 22 Juan Rojo LHC Top Working group meeting, 21/09/2016
Additional Material
23. 23 Juan Rojo LHC Top Working group meeting, 21/09/2016
24. 24 Juan Rojo LHC Top Working group meeting, 21/09/2016
25. 25 Juan Rojo LHC Top Working group meeting, 21/09/2016
26. 26 Juan Rojo LHC Top Working group meeting, 21/09/2016
27. 27 Juan Rojo LHC Top Working group meeting, 21/09/2016