cracow epiphany conference on present and future of b physics – 2012

1

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

2

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

3

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

4

[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)

5

The unitarity triangle is (?) a right triangle

Combining all these measurements (fit)

Tension with BR(Btn)

Vub

6

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…

7

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)

8

FCNC process at tree level in SM


Expected CPV parameters: - indirect (mixing induced) S ~ 3 % - direct C ~ -0.6%

(Illustration purpose only)

9


11


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

12


New results from beauty factories &

LHCb available soon

HFAG average of Y(4S) measurements in

agreement with SM

14

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


15


17


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…

18

A Few Anomalies More…

19

http://epiphany.ifj.edu.pl/current/pres/sacco.pdf

20


21

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

22


23

High statistics and resolution, low background


24


25

Two Hot Topics from LHCb

26

http://epiphany.ifj.edu.pl/current/pres/soomro.pdf

http://epiphany.ifj.edu.pl/current/pres/alessio.pptx

Large impact on new physics model

27


2828

End of 2012…?Now…


Analysis being updated with the 1.02fb-1 data already on tape

29

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:

29

CPV in B systems,

[LHC

b-CO

NF-

2011

-049

][L

HCb-

CON

F-20

11-0

51]


Vector-vector final stateneeds angular

analysis

3030

CPV in B systems, http://epiphany.ifj.edu.pl/current/pres/alessio.pptx

31

Combined result (+ ambiguous solution for )

Comparison with TevatronLHCb measurement tends to favour the SM positive

solution only solution possible!

31

[LHCb-CONF-2011-049]

CPV in B systems, http://epiphany.ifj.edu.pl/current/pres/alessio.pptx

32

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

cracow epiphany conference on present and future of b physics – 2012

Documents

sm http

sin2b http

bb mixing http

charm physics

flavor violation

new physics models correlation

b quarks

direct cpv