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Leptonic FInal State Boost Summary

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Summary talk for the BOOST09 workshop at SLAC from the leptonic final states working group

Summary talk for the BOOST09 workshop at SLAC from the leptonic final states working group


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  • 1. Boost09 Leptonic Final States Closing Remarks Roger Moore, Itay Yavin, Josh Ruderman, Natalia Toro, Philip Schuster, Andy, Haas, Jay Wacker, Mariangela Lisanti w/ non-local input from Yura Gershtein
  • 2. Production modes Lepton Jet + SM Jet Jet + Dark DY 2 lepton Jets (+ MET) (+SM Jets) Susy LSP to dark sector Z/Z’ to dark particles Direct dark particle production Lepton Jet + (Photon/Iso Leptons) (Shih &Thomas to appear)
  • 3. Two-Lepton Lepton Jets 2 oppositely signed leptons in a small cone Need more handles to get away from backgrounds Flavor universal + − Heavy Flavor dominated + − + − Ad 0 0 0 a a χA! 0 h χ0 SM Higgs-like Susy-like ditau identification ?
  • 4. 4-lepton lepton jet (single core) Decay Topology Relevant Parameters pT φ1 φ2 mφ1 mφ2 φ2 cτφ! cτφ2 φ1 ∆RSignal < 0.1 cτφ! ∼ 0.1 < ∆RIso < 0.4 ∼ ∼ Had Iso vs EM Iso cτφ2
  • 5. Usefulness/Danger of invariant masses Taking pairwise invariant masses, total invariant mass Gets away from SM continuum backgorund But may be multiple resonances &/or missing particles
  • 6. #' σ [mb] Additional Radiation !" #& J. Ruderman (to appear) !" Challenge with Isolation #% !" #$ !" ! !" ) Υ !" J/ψ ψ(2S) Motivates studying Had Iso vs EM Iso * !" φ ω R !" ρ Caveats for mφ > 700 MeV ∼ ! Combinatorics could hurt sensitivity ρ #! !" ! !"
  • 7. New Strong Sectors High multiplicity final states + − + Light mesons ωD ηD − √ ωD s ΛD 23-4/"5-&)")'& 0/-(*5506")'!-7')& !"#$%&'()*# &+*,'#-. qD +"!#*/01")0*/ √ s ΛD p − e p+ e #*89+5:-&;+'#0("5- '<'/) ¯ qD γ mA ΛD ωD + ωD ωD Lepton Jets =**&)'!-;#*!8()&- #'(*05-*>>-;+*)*/ − − ηD + − + ωD
  • 8. Other preliminary techniques/definitions Multicore lepton jets (muon only) General technique for collimated muons Loosening isolation for high multiplicity muon jets Nµ ≥ 4 ?? ET had < ∼ pT µ
  • 9. New Tools New Strong Signal Simulation (J. Wacker w/ S. Schumann, P. Richardson, F. Krauss) Dark Showering Sherpa & Herwig Hadron Spectrum DarkSpecGen Dark Hadronization Sherpa & Herwig Cascading to SM DarkSpecGen
  • 10. Advances to improve theoretical prediction Showering & Hadronization (Abelian & Non-Abelian) Parameterization/Categorization of Lepton jets & Production modes for benchmarks Implementation of benchmarks into MCs highlighting sensitivity differences between Tevatron/LHC/B-factories/Fixed Target/LHCb
  • 11. Advances to improve experimental sensitivity Tuning selection criteria to improve sensitivity of benchmark 4-lepton lepton jet parameterization Separating electron lepton jets from EM rich QCD jets Mixed 2mu+2e lepton jet study Hadronic isolation to prevent losses from additional dark radiation Scanning for di-mu resonances in hadronic events (Zurek & Gershetin)
  • 12. Late Tevatron/LEP or Early LHC Analyses and Measurements Measuring J/Psi production & pT spectrum Rate of muons from in-flight decays Measuring resolution/efficiency at small separation
  • 13. Summary Still making operative definitions of lepton Jets New signals + tools appearing Important searches to be done at Tevatron Early searches possible at LHC B-Physics & Fixed Targets Experiments SLAC Workshop on Dark Forces: Sept 24-26, 2009