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

HERA results on charm and beauty HERA-LHC Workshop, CERN, 30.05.2008 WG3 - Heavy Quarks

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

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

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

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

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

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

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

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

Charm contribution to F2 2008: 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

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

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

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

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

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

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

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

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

 need to measure c and b down to low pt!! 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

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

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

CMS & ATLAS (A. Starodumov, V. Andreev, R. Wolf) (M. zur Nedden, J 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

CMS & ATLAS: B programmes 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

CMS & ATLAS: b production measurement ATLAS: displaced J/y from B + several exlcusive channels CMS: b-jet tagging b Channel N (100 pb-1) B+  J/ K+ 17000 B0  J/ K0* 8700 Bs  J/  900 b  J/  260 up to > 1 TeV/c! HERA-LHC Workshop, CERN, 30.05.2008 WG3 - Heavy Quarks

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

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

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

LHCb (K.Harrison) dedicated to B Physics many complementary channels 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

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

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

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 NRQCD (1s) COM: transverse polarization for J/psi kT factorization model HERA-LHC Workshop, CERN, 30.05.2008 WG3 - Heavy Quarks

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

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

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

Thanks to: WG3 speakers WG3 participants the organizers HERA-LHC Workshop, CERN, 30.05.2008 WG3 - Heavy Quarks