Status Report on ALICE PPR Chapter 6.5: Charm and Beauty

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Status Report onALICE PPR Chapter 6.5 Charm
and Beauty

• Andrea Dainese
• University of Padova

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Contents of chapter 6.5
December 02

• 6.5.1 Charm and beauty production at LHC
• 6.5.2 Charm detection in hadronic channels
• 6.5.3 Charm and beauty detection in the
  semileptonic
• channels
• 6.5.4 Charm and beauty detection via e-m
  coincidences
• 6.5.5 Charm and beauty in pp collisions

Total 25 pages
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Contents of chapter 6.5
May 03

• 6.5.1 Physics motivations
• 6.5.2 Present experimental measurements of open
• charm production in heavy ion
  collisions
• 6.5.3 Charm and beauty production at LHC
• 6.5.4 Exclusive charm reconstruction in hadronic
• decay channels
• 6.5.5 Beauty detection in the semi-electronic
  decay
• channel
• 6.5.6 Charm and beauty detection in the
  semi-muonic
• decay channel

Total 43 pages
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6.5.1 Motivations

• Heavy quarks hard probes, produced in early
  stage
• they can probe matter produced
  in collision

energy loss ?
time
thermal charm ?
normalization for Quarkonia
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6.5.1.1 Accessible x range
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6.5.2 Present exp. situation

• Charm production in pA well studied and
  understood
• AA unclear and contradictory observations
• NA50 _at_ 17 GeV dimuons in IMR charm ? 3
  ?
• PHENIX _at_ 130 GeV single electron no
  nuclear/medium effects ?

(PHENIX _at_ 200 GeV included as soon as published)
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6.5.3 Production at LHC

• Total cross sections in nucleon-nucleon
  collisions
• Extrapol. to Pb-Pb collisions
• Extrapol. to min. bias p-Pb _at_ 8.8 TeV (only for
  MRST PDF)
• Spectral shapes and tuning of event generators
• the comparison with NLO pQCD is shown for PYTHIA
  and for Pb-Pb collisions _at_ 5.5 TeV
• now also shown for pp collisions _at_ 14 TeV
• a small paragraph on HERWIG was included for
  completeness
• for p-Pb tuning of PYTHIA taken from R. Vogt and
  comparison not shown
• Hadronization and decays
• yields for hadrons in Pb-Pb, in pp and in p-Pb
• comparison for pT and y of quark and meson
  parametrized pT shape of D and B mesons, but only
  for Pb-Pb _at_ 5.5 TeV

• P. Hristov, A. Morsch, A.D. integrate MNR code
• in AliRoot and run it to get the information that
  we miss
• cross section in p-Pb with CTEQ5 PDFs
• comparison of Pythia tuned to MNR for p-Pb

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6.5.4 Hadronic channels

• D0 ? Kp analysis in Pb-Pb ?
• done for B 0.4 T and dNch/dy 6000 ?
• extrapolations to lower multiplicity (3000) ?
• extrapolations to other values of magnetic field
  should be included ?
• In pp
• analysis final but text still missing
• In p-Pb (see Raffaeles report)
• strategy defined and tools ready
• results during summer
• Text needs clean-up and references to ch 5
  (tracking, vertex)
• Finally moving towards Physics Performance
  ERRORS (see my talk)
• Other channels D ? D0p (P. Hristov summer
  student),
• D only if additional effort

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6.5.5 Semi-electronic B

• Detailed simulation of B ? e X done in Padova
• Pb-Pb 6000 B 0.4 Tesla
• Internal Note almost ready
• PPR text almost ready
• need some more editing
• This analysis used TRD PID from TDR and 100
  tracking efficiency in TRD. Will get from GSI
• TRD identification efficiency from test-beam
• estimate of efficiency for track prolongation in
  TRD
• Extrapolation to 3000 might be included
• pp and p-Pb unlikely to come soon

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6.5.6 D and B with muons

• Study in progress (same inputs as for other
  studies being used)
• see Rachids report
• First schematic version of text with figures by
  June AW

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Summary

• Text in good shape
• introduction motivations, present data
• production / cross sections
• hadronic D0 in Pb-Pb
• semi-electronic B in Pb-Pb
• Work done, text missing
• hadronic D0 in pp (Andrea)
• Work in progress
• hadronic D0 in p-Pb (Raffaele)
• charm cross section from D0 more physics
  comparison with NLO pQCD and/or PYTHIA,
  comparison of pp, pA, AA (Andrea)
• D and B with muons (Rachid)
• What is still missing nothing really essential
• something on the physics with B