QCD 与强子物理研讨会, 2010 年 8 月 4 - 10 日,威海 Prospects of Flavor Physics...
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Transcript of QCD 与强子物理研讨会, 2010 年 8 月 4 - 10 日,威海 Prospects of Flavor Physics...
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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
高原宁清华大学高能物理研究中心
2010/8/6 1Y. Gao, Prospects of flavor physics at the LHC
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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
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LHC is running…
• ~400 nb-1/experiment delivered to ATLAS, CMS , LHCb• Date collected with high efficiencies (> 90%) • Much more underway…
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LHCb operation
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Quarkonia production
• Signals seen from data !
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Quarkonia production
• J/ in central region
• J/ in forward region
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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.
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Quarkonia production
• 1s, 2s and 3s→μ+μ-
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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)
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bb cross-section • bb in central region
• bb in forward region
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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
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bb cross-section • bb cross-section from BD0X, with D0 K - correlate D0 with of right (wrong) sign
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Fully reconstructed B events
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Flavor physics at hadron colliders
Tracking• We need good Vertexing Particle Identification
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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…
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LHCb Experiment
It is not very easy to realize MFV in theoretical models
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Tracking at ATLAS, CMS and LHCb
It is not very easy to realize MFV in theoretical models
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Hadron ID
It is not very easy to realize MFV in theoretical models
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Remarks on flavor physics
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• It is not easy to reconcile the 2 points: - The SM is very successful in describing quark mixing - New physics TeV
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Minimal Flavor Violation (MFV)
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• 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
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CKM Matrix
• At first sight the global CKM fit shows an excellent consistency.
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CKM Matrix
• Closer inspection shows some tensions …
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CKM Matrix • The sin2 & Br(B) tension: closer look
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CKM Matrix
• LHCb will measure in trees and loops
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Bs mixing
• Recent results from CDF & D0
- Bs J/ : 2.1 sigma -> 1.0 sigma
-> measures sin2s
- D0 observed a 3.2 sigma anomalous in like-sign dimuon charge asymmetry
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2010/8/6 23Y. Gao, Prospects of flavor physics at the LHC
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Bs mixing
• At LHCb, PID may help event selection and flavor tagging
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Bs mixing
• Prospects
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Bs,d →μ+μ−
• Very small in SM,
could be enhanced, e.g. in MSSM
• Current CDF (World’s best) limit
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10
9
10)1.01.1()(Br
10)3.06.3()(Br
d
s
B
B
.).%95(101.9: Expected
.).%95(106.7)(Br
.).%95(103.3: Expected
.).%95(103.4)(Br
9
9
8
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LC
LCB
LC
LCB
d
s
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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
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Bs →μ+μ− at LHCb
• LHCb roadmap
c.f. MC studies at 14 TeV
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B K* +-
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B K* +-
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B K* +-
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• Measurements seem favor • LHCb sensitivity:
0.1 fb-1 ~ B Factories
1.0 fb-1 ~ 4 sigma exclusion of SM (Assuming Belle central value)
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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.