Probing beyond the Standard Model with B Decays

ICHEP'04 Aug. 16-22 J. Chauveau - Probing beyond ... 1

Probing beyond the Standard Model with B Decays

J. ChauveauLPNHE Univ. Paris 6-7

On behalf of the BABAR Collaboration

ICHEP 2004, Aug. 16th – 22nd, 2004

Beijing, China


Outline

• Interplay between theory and experimentI. sin 2 with gluonic penguinsII. Polarization in B Vector Vector decaysIII. Puzzles in B PP decaysIV. Rare radiative and (semi) leptonic decays

probing electroweak penguins• Summary and outlook

All results are preliminary unless otherwise noted


Overview•Where will New Physics peek through the Standard Model (CKM)?

– Where SM itself depends on virtual particles:

• B mixing,• Penguin Decays (Rare processes).

– New physics brings new phases, heavy particles we can see here.

•Look for– Breakdown of Unitarity Triangle

• Doesn’t close ?• different measurements of an

angle disagree?– Rare processes which turn out not

to be rare.

Standard CKM fitUpdated for ICHEP04Thanks CKM fitter group!


sin 2 in b ccs tree decays See talk by M. Bruinsma in Session 8

ccbar KS, fCP= 1 J/ KL, fCP= 1

sin2β = 0.722 0.040 (stat) 0.023 (sys)|| = 0.950 0.031 (stat) 0.013 (sys) prl

PREL

IMIN

AR

Y


I. sin 2 in gluonic penguin mediated decays(1)

0 0

0 0

( ( ) ) ( ( ) )( )

( ( ) ) ( ( ) )sin( ) cos( )

CP

P

C

C

P

CP CPf

CP P

d df

C

f

B t f B t fA tB t f B t f

m t C m tS

;1Im2

2CP

CPCP

f

ffS

2

2

11

CP

CPCP

f

ffC

See talk by A. Hoecker (BABAR), and K.F. Chen (Belle) in session…

dd


sin 2 in gluonic penguin mediated decays (2)Belle in 2003: 3.5 from SM! Phys.Rev.Lett. 91 (2003) 261602

0.43 ± 0.27 ± 0.05

0.51 ± 0.26 ± 0.05 +0.18

–0.00

–0.96 ± 0.50 +0.09–0.11

0.02 ± 0.34 ± 0.03

0.56 ± 0.25 ± 0.04 +0.17

–0.00

0.47 ± 0.34 +0.08–0.06

η'KS

K+K–KS

ΦK0

2003

fSf

+0.27 ± 0.14 ±0.03

+0.55 ± 0.22 ± 0.12

+0.50 ±0.25 + 0.070.04

ICH

EP’

04

PRELIMINARY


sin 2 in gluonic penguin mediated decays(3)B0KS

B0KL 0 1.05 0.51

LKS

0 0.29 0.31SK

S

S= + 0.50 ± 0.25 + 0.07-0.04

C= + 0.00 ± 0.23 ± 0.05

B KS,L

227 106 B pairs

CP=+1

CP=+1

114 ± 12, 96 ± 18 events

PREL

IMIN

AR

Y

452 ± 28 events

B [non-KS

SKKKs


s-penguin average at 2.7 from sin2[cc] (BABAR only)

sin2 in gluonic penguin mediated decays(3)

Also New:0 0

0(980)B f K

The significant decrease in the statistical errors allow to perform interesting comparisons.

Precise CP(t) measurement in to watch.

0 0 0B K 0 0B K

100% 95% 90% pure-P

PRELIMINARY


II. Polarization in charmless B VV decays(1)See talk by A. Gritsan (BABAR) and J. Zhang (Belle) in session 11.

• Many spin-related observables of interest (11 from 3 amplitudes of B and Bbar):

•Polarization fractions,

•Direct CP asymmetries

•Triple product asymmetries

• In the SM, expect longitudinal polarization. Each spin flip (wrt e.g./ sL sRsL) costs 1/mb in amplitude.

• B K* puzzle (since 2002)

• Tree give fL~1, (=0.99 ± 0.05 ).

• In K* (Penguin), fL ~0.5


B0 K*PR

ELIM

INA

RY

No sign of CP violation

PRL

Polarization confirmed

FSI


Polarization in charmless B VV decays(3)B+

T

P

B- K*0

B0 K*0(1430)

PREL

IMIN

AR

Y


Polarization in charmless B VV decays(4)

confirmed

less striking

Belle10.0 ± 1.6 ± 0.8 6.7 ± 2.0 ± 0.9

0.43 ± 0.09 ± 0.04 86Bellehep-ex/3007014

From A. Gritsan session 11


Polarization in charmless B VV decays(5)In summary

• K* The polarization puzzle fL ~0.5, remains with better statistics.

• Many observables available to attack the problem: ACP, AT.

• More penguin modes become measurable like K*.

• The effect is less clear but the errors are still big.

• Tree dominated modes are fully polarized.

• An explanation is needed.

• New physics scenarios exist.

• Standard effects (strong interaction) to be understood.

• Many more measurements are in progress.


III. The “K(puzzle”

Thanks CKM fitter group!

b uus

Z,

qq

qq

PRELIMINARY

25.9 ± 1.3 ± 1.1

12.0 ± 0.7 ± 0.6

5.8 ± 0.6 ± 0.4

11.4 ± 0.9 ± 0.6

1.2 ± 0.3 ± 0.1


C= 0.40 ± 0.35 0.18, S= 0.56 ±0.44 CS= +0.05 ± 0.24 0.29, SS= 0.99 ±0.04 0.01

o Striking effect in rare K decays K AFB

CP=(0.03 ± 0.01) tan Y where Y~-1000 in K*, BIG. Enhancement of BF(b s,d ) and BF(b ) by factors 2 and 5. Could push up sin2 in KS. A connection between hadronic and electroweak decays

Keep in mind, it’s a 2sigma effect in strong interactions.

K(•The experiments measure easily many hadronic branching ratios. •The 2-body BF and Acp reach interesting precisions. (Lumi, PID)• Phenomenologists try to understand the whole busy picture.• Not so simple since ‘low energy’ QCD is at play in hadron dynamics• Isospin : reliable guideline (see how and can lead to CKM) • Models are built to match “unexpected features” high , low • “Unexpected features “ also show up in Kchannels (less than 2 sigma effect).• A scenario dealing with this “Kpuzzle’invokes electroweak-like penguin isospin breaking amplitudes to tame the discrepancies.• The scenario is predictive, so it’s fun:

Yoshikawa hep-ph0206147, Gronau-Rosner hep-ph/0307095, Benecke-Neubert 0308039, Buras, Fleischer, Recksiegel, Scwab hep-ph/0312259 &0402112


The “K(puzzle”

-0.133 ± 0.030 ± 0.009

Direct CP violation!

C=0.06 ± 0.18 ± 0.06

S= 0.35 ±0.30 0.33 ±0.04

0.06 ± 0.06 ± 0.02

0.01 ± 0.10 ± 0.02

C= 0.09 ± 0.15 ± 0.04

S= 0.30 ± 0.17 ± 0.02

PREL

IMIN

AR

Y

C= 0.12 ± 0.56 ±0.06


IV. Rare decays (radiative penguins)See talks by J. Berryhill/H. Yang and H. Staengle/A. Ishikawa in session 8

•Electroweak FCNC in the SM

• The EWSB scale is probed in the loop diagrams.

A window on the high energy collider physics.

• CP violation phenomenology could be rich.

• Inclusive channels difficult to measure, well predicted by theory, The opposite for the exclusive channels

• Highlights: b shown in Moriond.Time dependant CP violation in K*0(Ks


Radiative penguin decays (2)B

M. Iwasaki at Moriond 2004BF/(10-6 ) = (1.8 ± 0.6 ± 0.1)

PRL

Bd K* CP(t)

S = + 0.25 ± 0.63 ± 0.14C = 0.57 ± 0.32 ± 0.09A première

PREL

IMIN

AR

Y

BF < 1.2 x10-6 90% CLTheory: 0.9 - 1.6

PRL

PREL

IMIN

AR

Y


Rare decays (radiative penguins) (3) b s(d)

No surprise b s= 3.54 ± 0.30 (Exp.) vs 3.57 ± 0.30 (theo. NLO) ! CP asymmetries not limited by systematics nor by theory.

Time dependant ACP measured for the 1st time in radiative decays.

b d there?

b s l+l Lose one factor em but access to virtuality. Measure Mll spectrum and AFB.

A lot of new measurements to come.

b s bar

Expect BF/(10-6 )= in SM, measure 90% c.l. UL

4

0.3

52 K bar

100 bar

PRELIMINARY


Rare leptonic decays()

Some extensions to the SMincrease BF(B0 l+l by

105

See talk by G.P. Dubois-Felsman in session…

SM

9.3 ± 3.9 10-5

4.2 ± 1.8 10 –7

e+e- 1.9 10-15

8 10-11

e± 0

0

Clean in experiment and theory


SM NBB (106) Obs Backg U.L.(90%)

9.3 ± 3.9 10-5 124 10-72 8-55 3.3 10-4

4.2 ± 1.8 10 –7 88 11 5 ±2 6.6 10-6

e+e- 1.9 10-15 123 0 0.71 ±0.31 6.1 10-8

8 10-11 123 0 0.72 ±0.26 8.3 10-8

e± 0 123 2 1.29 ±0.44 18 10-8

0 88 171

1928

22 10-5

4.7 10-5

PRL

PRL

Rare leptonic decays()

• No surprise yet

• Some limits are close to the SM.

• More data already on tape.

(10-6)

PRELIMINARY

CLEO hep-ex/0408011

e


Summary and outlook• B factory in full production.• Many channels challenge the UT.• No significant breaking of the SM.• Penguins (gluonic or electroweak or unknown) offer ways to

look for new physics in rare decays.• The search reach an interesting level of precision. Intriguing BABAR-Belle differences. Therefore there are many effects (puzzles) to explore:

– sin2 in b s gluon. – Polarization in B Vector Vector.– Pattern of the K (and ) Branching Fractions.– Some rare decay searches reach the level of the SM.

A lot of action at the B factories for several years to come.


Backup slides


Luminosity


sin BABAR/Belle Winter 2004


s-penguin average at 2.7 from sin2[cc] (BABAR only)

no indication for direct CP violation

sin2 in gluonic penguin mediated decays(3)


Polarization in charmless B VV decays(backup)

From A. Gritsan session 11


Rare decays (radiative penguins) (backup)


exclusive

inclusive

Radiative penguin decays (backup)


In MSSM with MFV(Minimal Flavor Violation):

Rare leptonic decays(backup)

MH+ >138 GeV/c2

For tanSUSY=60PRELIMINARY

PRELIMINARY


New sans beta sans alpha


Old


New Avec beta et alpha

Probing beyond the Standard Model with B Decays

Documents

b mixing

b pairshcp

amplitudes of b

b decaysj

b f ks

b ccs tree decays

charmless b vv decays1see

charmless b vv decays4from