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QCD 与强子物理研讨会， 2010 年 8 月 4 － 10 日，威海 Prospects of Flavor Physics at the LHC

QCD 与强子物理研讨会， 2010 年 8 月 4 － 10 日，威海 Prospects of Flavor Physics at the LHC. 高原宁 清华大学高能物理研究中心. Outline (very selective view of the field). Early results from the LHC experiments LHC as a B factory Remarks on flavor physics Status and prospects - CKM matrix - B s mixing

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QCD 与强子物理研讨会， 2010 年 8 月 4 － 10 日，威海 Prospects of Flavor Physics at the LHC

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  1. QCD 与强子物理研讨会， 2010年8月4－10日，威海Prospects of Flavor Physics at the LHC 高原宁 清华大学高能物理研究中心 Y. Gao, Prospects of flavor physics at the LHC

  2. Outline(very selective view of the field) Early results from the LHC experiments LHC as a B factory Remarks on flavor physics Status and prospects - CKM matrix - Bs mixing - Rare decays Conclusion Y. Gao, Prospects of flavor physics at the LHC

  3. LHC is running… LHCb operation ~400 nb-1/experiment delivered to ATLAS, CMS , LHCb Date collected with high efficiencies (> 90%) Much more underway… Y. Gao, Prospects of flavor physics at the LHC

  4. Quarkonia production Signals seen from data ! Y. Gao, Prospects of flavor physics at the LHC

  5. Quarkonia production CMS preliminary : (4≤pT≤30GeV/c and |y| <2.4) BR(J/ψ→µ+µ−)·σ(pp→J/ψ + X) = (289.1 ± 16.7(stat) ± 60.1(syst)) nb LHCb preliminary : (pT≤10GeV/c and 2.5<y <4) σ(pp→J/ψ + X) = (7.65 ± 0.19(stat) ± 1.10(syst) +0.87-1.27 ) b Data favor neither color singlet nor color octet model. J/ in central region J/ in forward region Y. Gao, Prospects of flavor physics at the LHC

  6. Quarkonia production • σ(pp →Υ(1S)X)·B(Υ(1S)→µ+ µ−)=(8.3±0.5±0.9±1.0)nb • (Assuming no polarization and integrated over |y| <2.0) U(1s, 2s and 3s)→μ+μ- Y. Gao, Prospects of flavor physics at the LHC

  7. - bb cross-section - CMS preliminary : (4≤pT≤30GeV/c and |y| <2.4) BR(J/ψ→µ+µ−)· σ(pp→bX→ J/ψX’) = (56.1 ± 5.5(stat) ± 7.2(syst) )nb - LHCb preliminary : (pT≤10GeV/c and 2.5<y <4) σ(pp→ bX→ J/ψX’) = (0.81 ± 0.06(stat) ± 0.13(syst) ) b bb in central region bb in forward region Y. Gao, Prospects of flavor physics at the LHC

  8. - bb cross-section - bb cross-section from BD0X, with D0 K - correlate D0 with  of right (wrong) sign Y. Gao, Prospects of flavor physics at the LHC

  9. Fully reconstructed B events Y. Gao, Prospects of flavor physics at the LHC

  10. Y. Gao, Prospects of flavor physics at the LHC

  11. Flavor physics at hadron colliders Tracking • We need good Vertexing Particle Identification

  12. Flavor program at LHC • LHC is also a b-factory • Next generation of flavor program • 40% Bu , 40% Bd, 10% Bs, 10% b-baryons Bs is very hard at (Super-)B factories, but may be crucial for NP…

  13. LHCb Experiment It is not very easy to realize MFV in theoretical models

  14. Tracking at ATLAS, CMS and LHCb It is not very easy to realize MFV in theoretical models

  15. Hadron ID It is not very easy to realize MFV in theoretical models

  16. Remarks on flavor physics • It is not easy to reconcile the 2 points: • - The SM is very successful in describing quark mixing • - New physics  TeV Y. Gao, Prospects of flavor physics at the LHC

  17. Minimal Flavor Violation (MFV) • In the Standard Model • MFV Hypothesis • Yukawa coupling is unique source of flavor symmetry breaking also beyond the SM • It is not very easy to realize MFV in theoretical models Y. Gao, Prospects of flavor physics at the LHC

  18. CKM Matrix At first sight the global CKM fit shows an excellent consistency. Y. Gao, Prospects of flavor physics at the LHC

  19. CKM Matrix Closer inspection shows some tensions … Y. Gao, Prospects of flavor physics at the LHC

  20. CKM Matrix The sin2 & Br(B) tension: closer look Y. Gao, Prospects of flavor physics at the LHC

  21. CKM Matrix LHCb will measure  in trees and loops Y. Gao, Prospects of flavor physics at the LHC

  22. Bs mixing Recent results from CDF & D0 - Bs J/ : 2.1 sigma -> 1.0 sigma -> measures sin2s - D0 observed a 3.2 sigma anomalous in like-sign dimuon charge asymmetry Y. Gao, Prospects of flavor physics at the LHC

  23. Y. Gao, Prospects of flavor physics at the LHC

  24. Y. Gao, Prospects of flavor physics at the LHC

  25. Y. Gao, Prospects of flavor physics at the LHC

  26. Bs mixing At LHCb, PID may help event selection and flavor tagging Y. Gao, Prospects of flavor physics at the LHC

  27. Bs mixing Prospects Y. Gao, Prospects of flavor physics at the LHC

  28. Bs,d →μ+μ− Very small in SM, could be enhanced, e.g. in MSSM Current CDF (World’s best) limit Y. Gao, Prospects of flavor physics at the LHC

  29. Bs,d →μ+μ− at LHCb Ways to enhance S/B - Vertexing - Invariant mass - Muon ID Using control samples So far data consistent with MC background predictions Y. Gao, Prospects of flavor physics at the LHC

  30. Bs →μ+μ− at LHCb LHCb roadmap c.f. MC studies at 14 TeV Y. Gao, Prospects of flavor physics at the LHC

  31. B K* +- Y. Gao, Prospects of flavor physics at the LHC

  32. B K* +- Y. Gao, Prospects of flavor physics at the LHC

  33. B K* +- • Measurements seem favor • LHCb sensitivity: • 0.1 fb-1 ~ B Factories • 1.0 fb-1 ~ 4 sigma exclusion of SM • (Assuming Belle central value) Y. Gao, Prospects of flavor physics at the LHC

  34. Conclusion • Flavor programs at LHC (and Super B Factories) will provide further precise measurements on CKM matrix elements, (very) rare decay rates which are sensitive to new physics beyond the Standard Model. • Theory – Experiment interplay is essential to maximize the potential of these (expensive) programs. • Complementary to experiments at high energy frontier, flavor physics will help us to explore features of the new physics, hopefully in near future.

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