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Summary of the Epiphany Conference 2012 on Present and Future of B Physics. Xavier Prudent (IKTP , TU-Dresden). Cracow Epiphany Conference on Present and Future of B Physics – 2012 http://epiphany.ifj.edu.pl/current/index.php/page/programme. Crucial Questions in Flavor Physics.
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Summary of the Epiphany Conference 2012 on Present and Future of B Physics Xavier Prudent (IKTP, TU-Dresden) Cracow Epiphany Conference on Present and Future of B Physics – 2012 http://epiphany.ifj.edu.pl/current/index.php/page/programme
Crucial Questions in Flavor Physics http://epiphany.ifj.edu.pl/current/pres/buras.pdf What is the origin of particle masses and the reason for their hierarchy and hierarchy of the flavor-changing interactions ? CKM matrix Vqq‘ q q‘ W - Elementary SM Higgs ? - New strong dynamics with composite Higgs or without Higgs ? - Can it be linked with the matter-antimatter assymetry & dark matter? - Can the anomalies in flavor physics be explained ? Many precision measurements of many observables and precise theory Study patterns on flavor violation in new physics models (correlation between many flavor observables) Correlations between low energy flavor observables and collider physics (LHC, Tevatron) Top-Down Approach
http://epiphany.ifj.edu.pl/current/pres/miyabayashi.pdf CKM Scheme for CP Violation in quarks tested CKM matrix complex & unitar (VV†=1) Can be described as a triangle in a complex plane Overconstrained by very precise measurements Two exemples… [1] Measurement of sin(2b) at BaBar (465M BB) Amplitude of B-Bbar assymetry gives sin(2b)
[2] BL-BH mass difference Dmd ~ oscillation frequency (from semi-leptonic B decays) 1% precision has been reached Gives another reference point to constraint CKM triangle (here Vtd)
Combining all these measurements (fit) The unitarity triangle is (?) a right triangle Tension with BR(Btn) Vub
Room for new physics ? Pinguin contributions to bccs decays Compilation of sin(2beff) measurements No direct CP violation observed Measuresin(2beff) in bccs decays No significant deviation from BccK0(tree-only) Precision still statistically dominated Sensitivity of ~1% on sin2b, need Luminosity~10ab-1 (BaBa+Belle~1ab-1) Still room for new physics in BB mixing…
Looking for new physics in CP violation (CPV) http://epiphany.ifj.edu.pl/current/pres/margoni.pdf - Theoretically „clean“ channel (penguins cancel) - Experimentally „clean“ (large statistics, simple signature) B->J/Ψ(l+l-) Ks(p+p-) New physics contributions may induce CPV effects which modify the SM expectations
http://epiphany.ifj.edu.pl/current/pres/margoni.pdf FCNC process at tree level in SM Expected CPV parameters: - indirect (mixing induced) S ~ 3 % - direct C ~ -0.6% (Illustration purpose only)
http://epiphany.ifj.edu.pl/current/pres/margoni.pdf CP asymmetry Experimentally: Measure charge asymmetry in mixed semileptonic B0 events (tagging with lepton charge) Y(4S) machines & hadron colliders: b quarks produced mainly in bb pairs CPV in mixing if ASL≠0 Hadronic colliders measure a combinatin of B0d, B0s CP parameters: Cd,s depend on B production rates & mean mixing probability AbSL=CdadSL + CsasSL
http://epiphany.ifj.edu.pl/current/pres/margoni.pdf HFAG average of Y(4S) measurements in agreement with SM New results from beauty factories & LHCb available soon
http://epiphany.ifj.edu.pl/current/pres/margoni.pdf Standard Model: Charm physics is ~CP conserving: - indirect(mixing) CPV < 10-3 - direct CPV ~10-4 New physics could enhance these CPV up to 10-2 through loop diagrams
Standard Model: - negligible direct CPV expected - small ACP~10-3 in final states with K0S due to CPV in kaons http://epiphany.ifj.edu.pl/current/pres/margoni.pdf SM prediction: Large correction from assymetry of KKbar in nuclear interaction with matter (~10-20%) No significant CPV observed…
Right-handed models ? SU(2)R x SU(2)L x U(1)Y Cannot accomodate when including FCNC and EWSB constraints Assuming one or the other value lead to new physics in eK or Bdmixing Very interesting discussion on the interplay of observables by Buras http://epiphany.ifj.edu.pl/current/pres/buras.pdf „Need to wait for SuperB, Belle-II and smarter theorists to resolve this issue.“ Buras
High statistics and resolution, low background http://epiphany.ifj.edu.pl/current/pres/sacco.pdf
http://epiphany.ifj.edu.pl/current/pres/soomro.pdf http://epiphany.ifj.edu.pl/current/pres/alessio.pptx Large impact on new physics model
http://epiphany.ifj.edu.pl/current/pres/alessio.pptx Now… End of 2012…? Analysis being updated with the 1.02fb-1 data already on tape 28
http://epiphany.ifj.edu.pl/current/pres/alessio.pptx CPV in B systems, Phase of mixing in the system is expected to be very small • Precisely predicted: • New particles in box diagrams can modi the measured phase: Two decay modes for this study: first seen by LHCb last winter Lower statistics: Vector-vector final stateneeds angular analysis [LHCb-CONF-2011-049] [LHCb-CONF-2011-051] 29
http://epiphany.ifj.edu.pl/current/pres/alessio.pptx CPV in B systems, 30
http://epiphany.ifj.edu.pl/current/pres/alessio.pptx CPV in B systems, Combined result (+ ambiguoussolution for ) Comparison with Tevatron LHCb measurementtends to favour the SM positive solution onlysolutionpossible! [LHCb-CONF-2011-049] 31
Conclusion of the Epiphany Conference 2012 Incense Divine success of SM (CKM mechanismus) in description of flavor physics: New physics obviously a second order effect CPV in charm, b->sg, Dmd… Myrrh Final word of B factories (Belle, BaBar) on flavor physics. Sin(2b), Vub-Vcb puzzle, b->sg still statistically dominated Gold Anomalies observed: - Tension with B->tn in CKM fit - Vub-Vcb puzzle - 2HDM in B->D(*)tn - D0 charge asymmetry - CPV in t decay - Bs->mm measured by CDF Valuable only if true ! Coming experiments: (not covered here) - Upgrade of Daphne II - SuperB, SuperKEKB, Belle-II - Upgrade of LHCb - Plans for (g-2)m
