LHCb - Minimum Bias physics plans and MC framework - EPFL

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(All) Inclusive measurements Models used by Pythia and other generators were tuned mainly on Tevatron data (LEP and SPS also used). The agreement between models is broken at LHC, due to different energy extrapolations. The models disagree even more in the LHCb kinematical region, also η extrapolation. Even basic distributions such as charged particle multiplicity can help for the MC tuning, e.g. collection of minimum bias distributions of interest: http://home.fnal.gov/ skands/leshouches-plots/qcdplots-houches.pdf. The benchmark distributions variation range is constrained −→ “New (QCD) physics” see Rick Field Introduction to UE and MB studies. MCNet CERN R. Mures¸an, LHCb report – p.7/30
(All) Inclusive measurements Particle ratios: dn+ /dη dn − /dη , dn + /dpT dn − /dpT ..... can be done with very low integrated luminosity; vital for understanding charge asymmetries; Inclusive distributions: dn dX , d2n dXdY with X, Y = pT , η, φ ... distribution to be measured for: all charged particles, separately for positives and negatives; essential for the understanding of our detector; important input for tuning of (MB) Monte Carlo generators; joining the efforts of all LHC communities. MCNet CERN R. Mures¸an, LHCb report – p.8/30
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: Pseudorapidity range Studies of the
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 and 40: BCVEGPY Other generators in Gauss e
Page 41 and 42: BCVEGPY SHERPA 1.3. Other generator
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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