LHCb - Minimum Bias physics plans and MC framework - EPFL

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BCVEGPY SHERPA 1.3. Other generators in Gauss Sherpa as ProductionTool with EvtGen as well as PYTHIA with Sherpa as DecayTool. Sherpa as DecayTool: Signal decays are possible, but CP-violation does not work when using signal decays. Mass smearing still complicated, as PYTHIA particles have to come on-shell. Work in progress. Sherpa as ProductionTool: Incl. b ¯ b is possible but need to use PYTHIA for Pile-Up, as Sherpa can not produce Minimum Bias. Inclusion of Minimum Bias, would be a feature we would be happy to see in near future. Sherpa as Production+DecayTool: Is planned, as it would help us to benefit from the spin correlations used in Sherpa. As long as no Minimum Bias is available in Sherpa, we will have to use PYTHIA for Pile-up. Wish list: We would really appreciate if signal decays would become standard in Sherpa, e.g. part of the Run.dat steering files. Most important topic for us is correct simulation of CP violation when using signal decays as well as the correct simulation of the influences of CP violation on the angular distributions, e.g. in Bs → J/ψΦ or Bs → ΦΦ etc. MCNet CERN R. Mures¸an, LHCb report – p.26/30
BCVEGPY SHERPA 1.3. Other generators in Gauss Small experiment, not infinite amount of people, hard to find people to integrate the generators in our framework, but ... Gauss is able to read the ”external” events produced by any generator in LHA format both as parton-level ”hard” event, where Gauss will perform the subsequent hadronization, and as ”final hadronized” event. We can study practically all generators if one offers as input LHA-xml or HepMC Ascii files . For production through full simulation chain, on the Grid, one needs though to interface them to Gauss MCNet CERN R. Mures¸an, LHCb report – p.26/30
Page 1 and 2: LHCb - Minimum Bias physics plans a
Page 3 and 4: LHCb detector LHCb detector is full
Page 5 and 6: y 5m Vertex Locator TT Magnet 5m T1
Page 7 and 8: First data analysis corresponds to
Page 13 and 14: Pseudorapidity range Studies of the
Page 15 and 16: (All) Inclusive measurements Partic
Page 17 and 18: Strangeness production No valence s
Page 19 and 20: V 0 - Observables of interest η, y
Page 21 and 22: A glimpse to the first data LHCb ve
Page 23 and 24: J/ψ production J/ψ prompt product
Page 25 and 26: LHCb MC simulation The simulation a
Page 27 and 28: Generation of physics events The ge
Page 29 and 30: PYTHIA 6.421.(2) LHAPDF 5.7.1 Photo
Page 31 and 32: PYTHIA @ LHCb PYTHIA 6.4 (LHAPDF-CT
Page 33 and 34: Other generators in Gauss Gauss all
Page 39: BCVEGPY Other generators in Gauss e
Page 43 and 44: Inclusive production MCNet CERN R.
Page 45 and 46: Inclusive production Inclusive prod
Page 47: Thanks Several people helped me to

LHCb - Minimum Bias physics plans and MC framework - EPFL

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