B Factory Results and B Factory Results and ProspectsProspectsJames D. Olsen

Princeton University(on behalf of BaBar and Belle)

Workshop on the Interplay Between Workshop on the Interplay Between Collider and Flavo(u)r PhysicsCollider and Flavo(u)r Physics

CERN, December 3-4, 2007

Outline:

• a few words on CKM

• b → s(g, , l+l-)

• b → d(g, )

• rare decays and D mixing

Workshop on the Interplay Between Collider and Flavour Physics 2James D. Olsen

Status of the B FactoriesStatus of the B Factories

1fb477

1752fb

Expected by summer 2008:L(Belle) = 1ab-1, L(BaBar) = 0.750ab-1

Most analyses use ~490fb-1(Belle) or ~350fb-1(BaBar), so expect effective doubling of total dataset by next summer

Workshop on the Interplay Between Collider and Flavour Physics 3James D. Olsen

Impact of the B Factories and Impact of the B Factories and TevatronTevatron

1998

Enormous progress in the past decade has led to a paradigm change: Use precision CKM measurements to search for New

Physics (NP)

20072007

Workshop on the Interplay Between Collider and Flavour Physics 4James D. Olsen

Over-constraining CP ViolationOver-constraining CP Violation

Angles only

No Angles

026.0365.0

037.0172.0

021.0332.0

038.0120.0

Errors dominated by statistics

Errors dominated by systematics (thy+exp)

Workshop on the Interplay Between Collider and Flavour Physics 5James D. Olsen

Status and Prospects for Status and Prospects for

891 687

BaBarPreliminary

@68%CL

B0 → (0

2.09.04.0

2.09.05.0

05.014.070.0

10)17.029.084.0(

00

00

6

L

L

L

C

S

f

B

First time-dependent CPV measurment in B0 →

Final B Factory errors: S ~ 0.50

Workshop on the Interplay Between Collider and Flavour Physics 6James D. Olsen

Measuring Measuring

*cbcdVV

*tbtdVV*

ubudVV

nsuppressiocolor 3 uA3cA

)()(

)()(

DKBDKB

DKBDKBACP

For illustration only

Combine all Combine all measurements!measurements!

Method Modes Adv. Disadv.

GLW D0(CP±) Constraints

Low stats, small interf.

ADS D0(K) Large interf.

Low stats

GGSZD0(Kshh)

Dalitz

Large stats,

Dalitz info

Dalitz model

sinsinBrCLEO-c can help!

Can also measure sin(2) in tdcpv B0 → DX decays

Workshop on the Interplay Between Collider and Flavour Physics 7James D. Olsen

Status and Prospects for Status and Prospects for

)( 20.002.0

)( 14.0

1211 41 92

*KDr

DKr

B

B

Belle data using B → DK, D*K, and D*K* with 357fb-1:

)( 56.0

)( 12.018.0

)( 07.016.0

93 53

**24.018.0

*

1518

KD

KD

DKrB

Depending on rB, can get to stat ~ 8o – 14o with full dataset

208fb-1

Workshop on the Interplay Between Collider and Flavour Physics 8James D. Olsen

Searching for New Physics in b → s:

b → sg, b → s, b → sl+l-

Constraints from Bs mixing

Workshop on the Interplay Between Collider and Flavour Physics 9James D. Olsen

eff2sin

CP Violation in b CP Violation in b → sg→ sgSummer 2008

qsqbS allfor 2sin

: ModelStandard theIn

-5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5

2sin2sin eff

assuming same central value →

Interpretation limited by hadronic

uncertainties

Assuming no change in central values by

summer 2008, still two modes with > 3

discrepancy

Workshop on the Interplay Between Collider and Flavour Physics 10James D. Olsen

BR and ABR and Acpcp in b in b →→ ss

I) Fully inclusive (hadronic or leptonic tag)II) semi-inclusive (sum of exclusive modes)

Analysis techniques:

dsbBF 3 s.f. exp2435510)( 910

6

9.15.8140

81

81

L(fb-1)

Updated analyses from BaBar using > 300fb-1 are coming!

%7.34.0)( sbACP

• BF is systematics limited, fighting to < 5% difficult but not impossible• Acp (too! statistics limited (“forever”), should scale with lumi

after subtraction

Workshop on the Interplay Between Collider and Flavour Physics 11James D. Olsen

CP Violation in BCP Violation in B00 →→ (K(KSS00))

L, R interference!

)cos()sin(

])([])([

])([])([0000

0000

tmCtmS

KBKB

KBKBA

SS

SSCP

SM spin-flip penalty: S ms/mb*sin2

Ball and Zwicky Phys.Lett.B642:478-486,2006

• measurements statistics dominated (forever); expected final B Factory error ~0.17

• alternative analysis measuring photon helicity directly in B → K possible, but VERY difficult

Workshop on the Interplay Between Collider and Flavour Physics 12James D. Olsen

NP in FCNC: B NP in FCNC: B → K→ K(*)(*)llllHistorical example of interference and a new particle (Z0):

Modern opportunity in B → K(*)l+l- :

Observation of Z0 in UA1

(July 1983)-Z0 interference in e+e-

with s = 34.6GeV at DESY

(June 1982)

+?

Workshop on the Interplay Between Collider and Flavour Physics 13James D. Olsen

Results and Prospects for Results and Prospects for BBKK(*)(*)llllM. Nakao LP07

M. Nakao LP07

• BFs consistent with predictions

• AFB inconsistent with C9/C10 sign flip

• some “tension” (2) with SM @ low-q2

350fb-1

208fb-1

B Factory dataset will triple in these modes by summer 2008(more data → more bins!)

Workshop on the Interplay Between Collider and Flavour Physics 14James D. Olsen

Searching for New Physics in b → d:

b → dg, b → d

Constraints from Bd mixing

Workshop on the Interplay Between Collider and Flavour Physics 15James D. Olsen

CP Violation in BCP Violation in B0 0 → → KK00KK00

K0

K0

s

s

d

Final error from the B Factories ~ 0.36

15.0)SM(17.0

13.0)SM(02.0

KK

KK

C

S

Weak phases from mixing and decay cancel if top dominates:

Fleischer and Recksiegel, Eur.Phys.J.C38:251-259,2004

SM

Workshop on the Interplay Between Collider and Flavour Physics 16James D. Olsen

CP Violation in B CP Violation in B → →

Weak phase ~cancels plus spin-flip penalty (md/mb) → we really expect ~0!

Ball, Jones, and Zwicky Phys.Rev.D75:054004,2007

Measured by Belle (600fb-1):19.049.044.0

18.065.083.0

AC

S

Workshop on the Interplay Between Collider and Flavour Physics 17James D. Olsen

VVtdtd/V/Vts ts from b from b (s,d) (s,d)

/K* → |Vtd/Vts| = 0.200 ± 0.021 (exp) ± 0.015 (thy)mixing → |Vtd/Vts| = 0.2060 ± 0.0007 (exp) ± 0.0081 (thy)

Observation of B by Belle and BaBar allows a complementary

constraint on Vtd/Vts

BF x 106 Belle (386MBB) BaBar (347MBB)

B → ( (5.9) (6.4)0.110.20 13.1 0.08 25.1 25.024.0

*cbcdVV

*tbtdVV*

ubudVV

Workshop on the Interplay Between Collider and Flavour Physics 18James D. Olsen

New Physics in Rare Decays

Workshop on the Interplay Between Collider and Flavour Physics 19James D. Olsen

Searching for NP in B Searching for NP in B → →

Analysis techniques:

hadronic or leptonic tag

4104.06.1~ :SM

Difficult analysis:

• leptonic or hadronic tag (low )

• at least two neutrinos

• bkgs in Eextra difficult to model

Workshop on the Interplay Between Collider and Flavour Physics 20James D. Olsen

Results and Prospects for B Results and Prospects for B → →

4104.06.1~ :SM BaBar (350fb-1):

4

41.00.9-

4

102.03.04.02.1

102.04.0 8.1)(

101.06.09.0)(

BBF

BBF

BBF

446.0 56.051.0 49.0 1022.079.1)(

BBF

Belle hadronic tag (414fb-

1):

(leptonic)

(hadronic)

(combined)

World Average:

443.042.0 10 41.1)(

BBF

Final B Factory error ~ 0.28, but could do better with new tracking improvements from BaBar and leptonic tag analysis from Belle

M. Nakao LP07

Workshop on the Interplay Between Collider and Flavour Physics 21James D. Olsen

Observation of Not-Rare B Observation of Not-Rare B → → DD(*)(*)

H

Sensitive to NP as in B → (small e,masses could hide NP)

C. Chen and C. Geng, hep-ph/0608166A. Falk et al., PLB 326 145 (1994)

B0 → D*+

Accurate SM predictions:

Workshop on the Interplay Between Collider and Flavour Physics 22James D. Olsen

NP Prospects in B NP Prospects in B → D→ D(*)(*)

B → D sensitivity to NP

BaBar measurement

M. Tanaka hep-ph/9411405

(210fb-1)

(485fb-1)

Final B Factory error

Workshop on the Interplay Between Collider and Flavour Physics 23James D. Olsen

Lepton Flavor Violation in Lepton Flavor Violation in decaysdecays

-

mode

Belle BaBar

Br, 10-8 Lum. fb-

1

Br, 10-

8Lum. fb-1

<4.5 535 <6.8 232

e- <12 535 <11 232

e+ <2.4 535 <5.6 376

e+e- <2.8 535 <8.0 376

<3.4 535 <5.3 376

e- <4.3 535 <3.7 376

+ee <2.1 535 <5.8 376

e-ee <3.6 535 <4.3 376

Highly suppressed in SM!

Expected asymptotic limits:

• →< 2-3 x 10-8

• → < 2-3 x 10-8

(competitive with LHC @ 30fb-1)

Workshop on the Interplay Between Collider and Flavour Physics 24James D. Olsen

Status of DStatus of D00 Mixing MixingSensitivity to NP:

New @ Lepton-Photon 2007:

• BaBar lifetime ratio (3.0)

• BaBar Dalitz K0 (~2)

• CDF D → K analysis (3.2)

• still no sign of CP violation!

~5

CDF not yet included

BaBar 2007 %13.039.024.1 CPy

Workshop on the Interplay Between Collider and Flavour Physics 25James D. Olsen

Summary and OutlookSummary and Outlook The last ~decade has seen enormous progress in

the understanding of flavor physics Precision measurements of CKM parameters have

established KM as the dominant source CPV Null searches for rare/forbidden decays has significantly

reduced the phase space for NPMFV is the most likely NP scenario

B Factories will end operations in 2008 Total integrated luminosity ~ 1.7ab-1

Approximately double the current datasetMajor effort to repeat measurements on the final

datasets as soon as possible (major updates at ICHEP08) “Interplay” will continue into the LHC era

Once NP is discovered at LHC, we’ll know exactly where to look for it at Belle and Babar

The far-future belongs to LHCb and SuperB!