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“HERA and the LHC” Workshop 2006-2008 WG3 – Heavy Quarks Summary

“HERA and the LHC” Workshop 2006-2008 WG3 – Heavy Quarks Summary. WG3 Conveners: M.Cacciari, A.Dainese, A.Geiser, H.Spiesberger. HERA results on charm and beauty. Beauty in photoproduction. HERA/LHC. 2005:. Beauty in photoproduction. 2008:. S.Boutle. reasonable agreement with

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“HERA and the LHC” Workshop 2006-2008 WG3 – Heavy Quarks Summary

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  1. “HERA and the LHC” Workshop 2006-2008WG3 – Heavy Quarks Summary WG3 Conveners: M.Cacciari, A.Dainese, A.Geiser, H.Spiesberger HERA-LHC Workshop, CERN, 30.05.2008 WG3 - Heavy Quarks

  2. HERA resultson charm and beauty HERA-LHC Workshop, CERN, 30.05.2008 WG3 - Heavy Quarks

  3. Beauty in photoproduction HERA/LHC 2005: HERA-LHC Workshop, CERN, 30.05.2008 WG3 - Heavy Quarks

  4. Beauty in photoproduction 2008: S.Boutle reasonable agreement with NLO QCD predictions theory appropriate for LHC many HERA II results still to come HERA-LHC Workshop, CERN, 30.05.2008 WG3 - Heavy Quarks

  5. A. Jung Charm production at HERA full HERA II statistics 2008: HERA-LHC Workshop, CERN, 30.05.2008 WG3 - Heavy Quarks

  6. Azimuthal correlations & MC@NLO direct resolved enriched enriched data: charm+ dijet need NNLO or NLO+PS (MC@NLO) 2005: NLO norm. OK shape X Df 2008: MC@NLO for HERA now almost ready! Df(jj) T.Toll HERA-LHC Workshop, CERN, 30.05.2008 WG3 - Heavy Quarks

  7. HERA-LHC Workshop, CERN, 30.05.2008 WG3 - Heavy Quarks

  8. Heavy quarks in F2 HERA-LHC Workshop, CERN, 30.05.2008 WG3 - Heavy Quarks

  9. beauty contribution to F2 2005: Q2 >> mb2 HERA LHC, e.g. H, Z HERA-LHC Workshop, CERN, 30.05.2008 WG3 - Heavy Quarks

  10. P. Roloff beauty contribution to F2 2008: ~10 x more to come HERA-LHC Workshop, CERN, 30.05.2008 WG3 - Heavy Quarks

  11. 2008: Charm contribution to F2 combination efforts ongoing understand mass effects from beauty -> improved theory -> validate gluon PDF´s for LHC HERA-LHC Workshop, CERN, 30.05.2008 WG3 - Heavy Quarks

  12. Heavy quark-related news in M(R)ST(W) PDF sets R. Thorne • New prescription – ACOT(c) – for coefficients functions at the thresholds • New preferred values for the charm (1.4 GeV) and bottom (4.75 GeV) masses, obtained from detailed c2 analyses • Study of intrinsic heavy quarks • up to 0.3% intrinsic charm allowed by EMC data on F2c HERA-LHC Workshop, CERN, 30.05.2008 WG3 - Heavy Quarks

  13. R. Thorne HERA-LHC Workshop, CERN, 30.05.2008 WG3 - Heavy Quarks

  14. R. Thorne HERA-LHC Workshop, CERN, 30.05.2008 WG3 - Heavy Quarks

  15. Towards 3-loop (as3) F2c I. Bierenbaum HERA-LHC Workshop, CERN, 30.05.2008 WG3 - Heavy Quarks

  16. Towards 3-loop (as3) F2c I. Bierenbaum HERA-LHC Workshop, CERN, 30.05.2008 WG3 - Heavy Quarks

  17. A look to the near future:perspectives at LHC HERA-LHC Workshop, CERN, 30.05.2008 WG3 - Heavy Quarks

  18. LHC: heavy quarks factory • Cross sections: NLO (MNR) • mc=1.2 GeV, mF=mR=2mc; mb=4.75 GeV, mF=mR=mb • Yields: assuming sppinel = 70 (40) mb at 14 (0.9) TeV LHC startup at 10 TeV: cross sections smaller by 20% w.r.t. 14 TeV HERA-LHC Workshop, CERN, 30.05.2008 WG3 - Heavy Quarks

  19. Updated benchmark cross sections charm, pp 14 TeV from HERA-LHC 04/05 Proceedings Update for b at 14 TeV (MC@NLO by R. Guernane): NEW HERA-LHC Workshop, CERN, 30.05.2008 WG3 - Heavy Quarks

  20. H. Spiesberger accessible with HQ at HERA  need to measure c and b down to low pt!! HERA-LHC Workshop, CERN, 30.05.2008 WG3 - Heavy Quarks

  21. HERA-LHC Workshop, CERN, 30.05.2008 WG3 - Heavy Quarks

  22. 1 year pp 14 TeV @ nominal lumin. ATLAS/CMS (b) 100 LHCb (b) pT of Q-hadron [GeV] 10 ALICE (b) (c) ALICE (c/b) 1 -2 0 2 4 6 h of Q-hadron Acceptance for open heavy flavor at LHC H1/ZEUS important: complementarity of the 4 experiments HERA-LHC Workshop, CERN, 30.05.2008 WG3 - Heavy Quarks

  23. CMS & ATLAS(A.Starodumov, V.Andreev, R.Wolf)(M.zur Nedden, J.Ginzburg, E.Lytken) • Muon detection • Calorimetry • Silicon trackers • About (only) 5% of trigger bandwidth for B Physics HERA-LHC Workshop, CERN, 30.05.2008 WG3 - Heavy Quarks

  24. CMS & ATLAS: B programmes CMS ATLAS • CP violation (e.g. B→J/ψ(X), B→) • Bs oscillations (e.g. Bs→Dsπ, Bs→Dsa1) • Rare decays (e.g. B→(X), B→K*γ) • Inclusive cross section measurement HERA-LHC Workshop, CERN, 30.05.2008 WG3 - Heavy Quarks

  25. CMS & ATLAS: b production measurement ATLAS: displaced J/y from B + several exlcusive channels CMS: b-jet tagging b up to > 1 TeV/c! HERA-LHC Workshop, CERN, 30.05.2008 WG3 - Heavy Quarks

  26. LHC vs HERA: one heavy quark more (top!) (> 2104 GeV2) HERA-LHC Workshop, CERN, 30.05.2008 WG3 - Heavy Quarks

  27. Theoretical developments in top production at LHC HERA-LHC Workshop, CERN, 30.05.2008 WG3 - Heavy Quarks

  28. HERA-LHC Workshop, CERN, 30.05.2008 WG3 - Heavy Quarks

  29. LHCb(K.Harrison) • dedicated to B Physics • CP violation • rare decays • B spectroscopy • many complementary channels • example: measurement of b cross section • inclusive displaced muons • inclusive displaced J/y & D’s • exclusive B mesons e.g. B+J/yK+ HERA-LHC Workshop, CERN, 30.05.2008 WG3 - Heavy Quarks

  30. D0 K + p B  e + X ALICE (C.Bombonati, D.Stocco,R.Guernane,G.Bruno) Pb-Pb 5.5 TeV pp 14 TeV p-Pb 8.8 TeV Charm Beauty down to (almost) 0 pT! HERA-LHC Workshop, CERN, 30.05.2008 WG3 - Heavy Quarks

  31. 2<pT<3 Gev 3<pT<5 Gev pT>5 Gev ALICE displaced J/ye-e+ This measurement will be performed by all 4 LHC experiments COMPARE ALICE CDF pT>0 tot tot J/y J/y from B bkg HERA-LHC Workshop, CERN, 30.05.2008 WG3 - Heavy Quarks

  32. NRQCD Quarkonia production at LHC J/ • Among first measurements + theoretical interest: What is the production mechanism? • The Color Octet Mechanism agrees well with measured  shape from Tevatron Polarization measurements: CDF sees no sign of pol. for J/, and DØ (1S) measurements not consistent with predictions. More data with high-pT needed!  Tevatron data Color octet Color singlet (1s) kT factorization model HERA-LHC Workshop, CERN, 30.05.2008 WG3 - Heavy Quarks

  33. measurement will be performed by all 4 experiments HERA-LHC Workshop, CERN, 30.05.2008 WG3 - Heavy Quarks

  34. Forward J/y production at ALICE sensitive to gluon PDF down to x=10-6 gg contribution dominant normalized to 1 => study shape only HERA-LHC Workshop, CERN, 30.05.2008 WG3 - Heavy Quarks

  35. Summary and Conclusions • Heavy Flavour production in ep and pp collisions is good testing ground for perturbative QCD • charm production: reasonably described, no clear preference between "massive" NLO and "massless" NLL calculations. NNLO or NLO+PS needed for some regions of phase space  MC@NLO now available for HERA; should be used for LHC • beauty production: reasonable description at high pTb -> OK for LHC results seen at this workshop show agreement down to low pTb • Charm and beauty production at low pt at LHC: small-x effects? saturation?  to be measured by LHC experiments • DIS (F2): both charm and beauty well described first measurement of F2bb  understand mass effects, then extract b and gluon for LHC • J/y production: LHC experiments have potential to clarify theory interpretation of picture emerging from Tevatron and HERA data HERA-LHC Workshop, CERN, 30.05.2008 WG3 - Heavy Quarks

  36. Thanks to: WG3 speakersWG3 participantsthe organizers HERA-LHC Workshop, CERN, 30.05.2008 WG3 - Heavy Quarks

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