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

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Presentation on theme: "“HERA and the LHC” Workshop WG3 – Heavy Quarks Summary"— Presentation transcript:

1 “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, WG3 - Heavy Quarks

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

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

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

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

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

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

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

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

11 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, 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, WG3 - Heavy Quarks

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

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

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

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

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

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

20  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, WG3 - Heavy Quarks

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

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

23 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, WG3 - Heavy Quarks

24 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, WG3 - Heavy Quarks

25 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, WG3 - Heavy Quarks

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

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

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

29 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, WG3 - Heavy Quarks

30 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, WG3 - Heavy Quarks

31 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, WG3 - Heavy Quarks 31

32 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, WG3 - Heavy Quarks

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

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

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