1 cracow epiphany conference on present and future of b physics – 2012 xavier prudent (iktp,
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Cracow Epiphany Conference on Present and Future of B Physics – 2012
http://epiphany.ifj.edu.pl/current/index.php/page/programme
Xavier Prudent (IKTP, TU-Dresden)
Summary of the Epiphany Conference 2012 on Present and Future of B Physics
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What is the origin of particle masses and the reason for their hierarchy and hierarchy of the flavor-changing interactions ?
CKM matrixq q‘
W
Vqq‘
http://epiphany.ifj.edu.pl/current/pres/buras.pdfCrucial Questions in Flavor Physics
- 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
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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 measurementsTwo exemples…
[1] Measurement of sin(2b) at BaBar (465M BB)
Amplitude of B-Bbar assymetry gives sin(2b)
http://epiphany.ifj.edu.pl/current/pres/miyabayashi.pdf
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[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)
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The unitarity triangle is (?) a right triangle
Combining all these measurements (fit)
Tension with BR(Btn)
Vub
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Compilation of sin(2beff) measurements
No significant deviation from BccK0 (tree-only)
Precision still statistically dominatedSensitivity of ~1% on sin2b, need Luminosity~10ab-1
(BaBa+Belle~1ab-1)
Room for new physics ?
No direct CP violation observed
Measure sin(2beff) in bccs decays
Pinguin contributions to bccs decays
Still room for new physics in BB mixing…
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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
Looking for new physics in CP violation (CPV)
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FCNC process at tree level in SM
http://epiphany.ifj.edu.pl/current/pres/margoni.pdf
Expected CPV parameters: - indirect (mixing induced) S ~ 3 % - direct C ~ -0.6%
(Illustration purpose only)
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http://epiphany.ifj.edu.pl/current/pres/margoni.pdf
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http://epiphany.ifj.edu.pl/current/pres/margoni.pdf
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
CP asymmetry
Hadronic colliders measure a combinatin of B0d, B0
s CP parameters: Cd,s depend on B production rates & mean mixing probabilityAb
SL=Cd adSL + Cs as
SL
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http://epiphany.ifj.edu.pl/current/pres/margoni.pdf
New results from beauty factories &
LHCb available soon
HFAG average of Y(4S) measurements in
agreement with SM
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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
http://epiphany.ifj.edu.pl/current/pres/margoni.pdf
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http://epiphany.ifj.edu.pl/current/pres/margoni.pdf
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http://epiphany.ifj.edu.pl/current/pres/margoni.pdf
Large correction from assymetry of KKbar in nuclear interaction with matter (~10-20%)
Standard Model: - negligible direct CPV expected - small ACP~10-3 in final states with K0
S due to CPV in kaons
SM prediction:
No significant CPV observed…
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A Few Anomalies More…
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http://epiphany.ifj.edu.pl/current/pres/sacco.pdf
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http://epiphany.ifj.edu.pl/current/pres/sacco.pdf
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Cannot accomodate when including FCNC and EWSB constraints
Assuming one or the other value lead to new physics in eK or Bd mixingVery interesting discussion on the interplay of observables by Buras
„Need to wait for SuperB, Belle-II and smarter theorists to resolve this issue.“Buras
http://epiphany.ifj.edu.pl/current/pres/buras.pdf
Right-handed models ? SU(2)R x SU(2)L x U(1)Y
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http://epiphany.ifj.edu.pl/current/pres/sacco.pdf
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High statistics and resolution, low background
http://epiphany.ifj.edu.pl/current/pres/sacco.pdf
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http://epiphany.ifj.edu.pl/current/pres/sacco.pdf
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Two Hot Topics from LHCb
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http://epiphany.ifj.edu.pl/current/pres/soomro.pdf
http://epiphany.ifj.edu.pl/current/pres/alessio.pptx
Large impact on new physics model
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http://epiphany.ifj.edu.pl/current/pres/alessio.pptx
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End of 2012…?Now…
http://epiphany.ifj.edu.pl/current/pres/alessio.pptx
Analysis being updated with the 1.02fb-1 data already on tape
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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:
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CPV in B systems,
[LH
Cb-C
ON
F-20
11-0
49]
[LH
Cb-C
ON
F-20
11-0
51]
http://epiphany.ifj.edu.pl/current/pres/alessio.pptx
Vector-vector final stateneeds angular
analysis
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CPV in B systems,
http://epiphany.ifj.edu.pl/current/pres/alessio.pptx
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Combined result (+ ambiguous solution for )
Comparison with TevatronLHCb measurement tends to favour the SM positive
solution only solution possible!
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[LHCb-CONF-2011-049]
CPV in B systems,
http://epiphany.ifj.edu.pl/current/pres/alessio.pptx
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Conclusion of the Epiphany Conference 2012
IncenseDivine success of SM (CKM mechanismus) in description of flavor physics: New physics obviously a second order effectCPV in charm, b->sg, Dmd…
MyrrhFinal word of B factories (Belle, BaBar) on flavor physics. Sin(2b), Vub-Vcb puzzle, b->sg still statistically dominated
GoldAnomalies 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 CDFValuable only if true !
Coming experiments: (not covered here) - Upgrade of Daphne II - SuperB, SuperKEKB, Belle-II - Upgrade of LHCb - Plans for (g-2)m