rare hadronic b decaysmoriond.in2p3.fr/qcd/2006/sundaymorning/kroseberg.pdf · 2006. 3. 18. ·...

Rare Hadronic B Decays J. Kroseberg (BaBar) Moriond QCD, March 19 '06 1SCIPP

BaBar

SCIPPXLIst Rencontres de MoriondQCD and High-Energy Hadronic Interactions

La Thuile, Italy, March 18-25, 2006

Jürgen KrosebergSanta Cruz Institute for Particle Physics

University of California, Santa Cruz

on behalf of the BaBar Collaboration

Rare Rare HadronicHadronicBB DecaysDecays


BaBar

OutlineOutline

1) B decays to open charm2) Charmless decays

study of decay mechanismsfactorization testscharm countingsearch for new physics

[complementing Ben Lau’s presentation earlier today]


BaBar

BB→→DD(*)(*)DD(*) (*) : Motivation: Motivation__

Test of factorization in heavy-heavy decays

b

d

c

d

c

d

D−

D+

B0

b

d

c

dD−B0

c

dD+≈ ×

fD

Decay constant from leptonic decays

Form factor fromsemileptonic decays

Size of final-state interactions?Without FSI, factorization predicts B (B0 → D(*)0D(*)0) = 0

_

Phys. Lett. B 458, 375 (1999)

Size of W exchange contribution?(see below)Relevant for CKM constraints:

Measurement of γ when combined with B0 → Ds*+D*−sin(2β) extraction from B0 → D*+D*−

http://dx.doi.org/10.1016/S0370-2693(99)00611-5


BaBar

BB→→DD(*)(*)DD(*) (*) : Results: Results

Mode Branching Fraction / 10−4

B0 → D0D0 0.30.60.75.57.312.04.95.23.85.3

B0 → D*0D0

B0 → D*0D*0

B0 → D+D−

B0 → D*+D−

B0 → D*+D*−

B− → D−D0

B− → D*−D0

B− → D−D*0

B− → D*−D*0

Prediction


BaBar

W Exchange Decays BW Exchange Decays B00→→DD(*)(*)ss++DD(*)(*)ss--

X

211/fb, 232x106 BB pairs

highly suppressed in SMsensitive to new physicsprovides estimates of W-exchange contribution to B0 D+D-Phys. Lett. B584, 81 (2004)

W

Predictions: Results (90% C.L.)

hep-ph/0308243 hep-ph/0501031Phys.Rev.D72,111101(2005)

[Belle (hep-ex/0508040): B(B0 Ds-Ds+) < 2.0 x 10-4]

Reaching sensitivity to test SM prediction


BaBar

Annihilation Decays Annihilation Decays BB→→DDSS(*)(*)ϕϕ

5.2 5.21 5.22 5.23 5.24 5.25 5.26 5.27 5.28 5.29 5.30

1

2

3

4

5

6

5.2 5.21 5.22 5.23 5.24 5.25 5.26 5.27 5.28 5.29 5.30

1

2

3

4

5

6

��

��

�

��

��

��

5.2 5.21 5.22 5.23 5.24 5.25 5.26 5.27 5.28 5.29 5.30

1

2

3

4

5

6

5.2 5.21 5.22 5.23 5.24 5.25 5.26 5.27 5.28 5.29 5.30

1

2

3

4

5

6

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Could be enhanced by New Physics

B-→Ds- φ B-→D*s- φ

Previous CLEO limit:BR(B-→Ds- φ) < 3 x 10-4BR(B-→D*s- φ) < 4 x 10-4Phys. Lett. B319, 365 (1993)

Standard Model B : (3..7) x 10-7

W

BR< 1.9 x 10-6 [90% C.L.] BR< 1.2 x 10-5 [90% C.L.]

X


mES

Two orders of magnitude improved; one order of magnitude from SM

Sensitivity to New Physics: Competitive limits on parameters in the type II Two-Higgs-Doublet model and the MSSM with R-parity violation.


BaBar

Charm Production in Recoil: MethodCharm Production in Recoil: Method

RECOIL

Fully reconstruct one BB flavor tagmomentum contraint

Reconstruct charm hadronfrom remaining tracks :

small combinatoricscharge and momentum

Count charm particles on the recoil side + measure momentum in the parent B restframe. Distinguish

a) anticorrelated (b cX) and correlated (b cX) production

b) charged and neutral parent B

Update of earlier result with more statisticsand improved methods

/ correlated (GeV/c)C*p

0 0.5 1 1.5 2 2.5

/(0

.15

GeV

/c)

2 1

0×

BR

0

2

4

6

8

10 X0 D→ -(a) B

/ anticorrelated (GeV/c)C*p

0 0.5 1 1.5 2 2.5 /

(0.1

5 G

eV/c

)2

10

×B

R

0.0

0.5

1.0

1.5

2.0 X

0D → -(b) B

_

BABARpreliminary

BABARpreliminary


BaBar

Charm Production in Recoil: ResultsCharm Production in Recoil: Results

prediction ≈ 97 prediction ≈ 24 ± 5 %hep-ph/0011258

210/fb, 231x106 BB pairs [preliminary]

First (3.5σ) evidence for inclusive correlated Ds production; Nc agrees with expectation.


BaBar

Testing Factorization with BTesting Factorization with B00 →→ DD**ωπωπ

mX2 (GeV2)

B0→ D*ωπτ data

CLEO

Γ(B

→D

* lν)

dm

X2

dΓ(

B→

D* ω

π)1

(GeV

-2)

____

____

____

____

__

(b)

0

0.01

0.02

0.03

0.04

0 0.5 1 1.5 2 2.5 3 3.5

W+B0 D*

ωπ+ W+B0 D*

l+νW

ντ

ωπτ

In agreement with predictions based on factorization and τ decays


BABARpreliminary

Also: ΓL/Γ=0.654 ±0.042 ±0.016 (from D* angular analysis)consistent with predictions (factorization, HQET and semi-lept. B decays)


BaBar

)2

(GeV/cpΛm2.5 3 3.5 4 4.5 5

)2Pl

ot E

vent

s / (

0.3

86 G

eV/c

s

0

10

20

30

40

50

60

)2

(GeV/cpΛm2.5 3 3.5 4 4.5 5

)2Pl

ot E

vent

s / (

0.3

86 G

eV/c

s

0

10

20

30

40

50

60BABAR preliminary

)2

(GeV/cESm5.20 5.22 5.24 5.26 5.28 5.30

)2E

vent

s / (

4 M

eV/c

0

5

10

15

20

25

30

35

)2

(GeV/cESm5.20 5.22 5.24 5.26 5.28 5.30

)2E

vent

s / (

4 M

eV/c

0

5

10

15

20

25

30

35

BABARpreliminary

E (GeV)∆-0.10 -0.05 0.00 0.05 0.10

Eve

nts

/ ( 8

MeV

)

0

5

10

15

20 22± = 459

bkgN

8.4± = 50.2 sig

N

E (GeV)∆-0.10 -0.05 0.00 0.05 0.10

Eve

nts

/ ( 8

MeV

)

0

5

10

15

20 BABARpreliminary

Baryonic B DecaysBaryonic B Decays

50.2 ±8.4 signal events

*Phys. Rev. D71, 072007 (2005)

B=(2.15 ±0.36 ±0.13 ±0.56) x 10-5

Consistent with earlier Belle result*

Consistent with earlier Belle result*; precision significantly improved

BB00 ΛΛccp p [with Λc pK-π+]

BB= (3.30 = (3.30 ±±0.53 0.53 ±±0.31) x 100.31) x 10--66

BB00 ΛΛppππ−−

73.2 signal events

*Phys. Lett. B617, 141 (2005)

211/fb, 232x106 BB pairs 211/fb, 232x106 BB pairs _

stat. syst. B (Λc pKπ)

+12.0-11.2

near-threshold enhancement

as observed in other baryonic B decays

[Λc pK-π+ BF from PDG: (5.0 ±± 1.3)%]1.3)%]

E (GeV)∆-0.2 -0.15 -0.1 -0.05 -0 0.05 0.1 0.15 0.2

Eve

nts

/ ( 2

0 M

eV )

0

10

20

30

40

50

60

E (GeV)∆-0.2 -0.15 -0.1 -0.05 -0 0.05 0.1 0.15 0.2

Eve

nts

/ ( 2

0 M

eV )

0

10

20

30

40

50

60 BABAR preliminary

)2

(GeV/cESm5.2 5.21 5.22 5.23 5.24 5.25 5.26 5.27 5.28 5.29

)2E

vent

s / (

4.7

5 M

eV/c

0

10

20

30

40

50

60

70

)2

(GeV/cESm5.2 5.21 5.22 5.23 5.24 5.25 5.26 5.27 5.28 5.29

)2E

vent

s / (

4.7

5 M

eV/c

0

10

20

30

40

50

60

70BABAR preliminary

_ _

_

mES ∆EmES

∆E

mΛp

http://dx.doi.org/10.1016/S0370-2693(99)00611-5http://dx.doi.org/10.1016/S0370-2693(99)00611-5


BaBar

CharmlessCharmless B DecaysB Decays


BaBar

bb qqsqqs Penguin DecaysPenguin Decays

∆S:= difference in sin(2β)from b ccs andb qqs penguin

Large |∆S| would indicate new physics.

NB: Standard Model corrections (‘pollution’)

sin(2βeff)/sin(2φe1ff)

b→ccs

φ K0

η′ K0

f0 KS

π0 KS

π0 π0 KS

ω KS

ρ0 KS

K+ K- K0

KS KS KS

-3 -2 -1 0 1 2 3

World Average 0.69 ± 0.03

Average 0.47 ± 0.19

Average 0.50 ± 0.09

Average 0.75 ± 0.24

Average 0.31 ± 0.26

Average -0.84 ± 0.71

Average 0.63 ± 0.30

Average 0.17 ± 0.58

Average 0.51 ± 0.14 +-00..1018

Average 0.61 ± 0.23

H F A GH F A GMoriond 2006PRELIMINARY

∗

∗ new result, cf. J. Ocariz’s presentation at Moriond EW

__

__


BaBar

Constraining SM Pollution (I)Constraining SM Pollution (I)

Measurements or limits exist for all 11 BF except K*0 K0

Constrain subdominant (Vub) contributions to B φΚ0 via SU(3)relations to obtain SM bound on ∆S φΚ0 Phys. Rev. D 68, 015004 (2003)

Search for BSearch for B00 K*K*00 KKss (first time!)

B(B0 K*0 K0) + B(B0 K*0 K0)< 1.9x10-6 @ 90% C.L.

SU(3) upper bound in ∆S φΚ0 : 0.43

Search for BSearch for B00 φπφπ (update)

B(B0 φπ0) < 2.8x10-7 @ 90% C.L.[B(B+ φπ+) < 2.4x10-7 @ 90% C.L.]

208/fb, 230x106 BB pairs 211/fb, 232x106 BB pairs

_ _

Consistent with theoretical expectations

NB: interesting measurements in their own rights!


BaBar

Constraining SM Pollution (II)Constraining SM Pollution (II)

Likelihood ratio0 0.2 0.4 0.6 0.8 1

Eve

nts

/ bin

1

10

210

310

Likelihood ratio0 0.2 0.4 0.6 0.8 1

Eve

nts

/ bin

1

10

210

310

Estimated 20% reduction in theoretical uncertainty on ∆S η’ KS

Results (@ 90% C.L.)B(B0 η π0) < 1.3x10-6B(B0 η’ π0) < 2.1x10-6B(B0 η’ η) < 1.7x10-6


Similar for B η’ Ks :

B0 η’ ηππ π0

BABARpreliminary

datasignal MC (arbitrary scale)background MC sig.+bgrnd. MC


BaBar

Avoiding SM Pollution: BAvoiding SM Pollution: B00 KKss00KKss00KKLL00

E (GeV)∆-0.01 0 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08

Eve

nts

/ (

0.00

6 G

eV )

0

20

40

60

80

100

120

E (GeV)∆-0.01 0 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08

Eve

nts

/ (

0.00

6 G

eV )

0

20

40

60

80

100

120

)-610×BR(0 1 2 3 4 5 6 7 8 9 10

) 0-2

ln (

L/L

0

1

2

3

4

5

6

)-610×BR(0 1 2 3 4 5 6 7 8 9 10

) 0-2

ln (

L/L

0

1

2

3

4

5

6

Pure b sss penguin transition Vub SM pollution only via rescatteringCP eigenstate no dilution of CP asymmetry

No significant evidence

B(B0 Ks0Ks0KL0) = (2.4 ±0.6)x10-6 (


BaBar

Search for BSearch for B ηη’’ρ/ρ/K*K*

E (GeV)∆-0.2 -0.1 0 0.1

Eve

nts

/ ( 0

.025

GeV

)

02468

10121416

E (GeV)∆-0.2 -0.1 0 0.1

Eve

nts

/ ( 0

.025

GeV

)

02468

10121416 BABAR

preliminary

*0 Kππη

’η

)-6) (10*0’ Kη→BR(B0 2 4 6 8 10 12 14 16 18 20

) 0-2

ln (

L/L

0

10

20

30

40

50

60

70

80

90

)-6) (10*0’ Kη→BR(B0 2 4 6 8 10 12 14 16 18 20

) 0-2

ln (

L/L

0

10

20

30

40

50

60

70

80

90 BABARpreliminary

New results

3.8 ± 1.1 ± 0.5 (4.5σ)4.9+1.9−1.7 ± 0.8 (3.6σ) < 7.9

0.4+1.2−0.9+1.6−0.6 (0.3σ) < 3.7

6.8+3.2−2.9+3.9−1.3 (2.3σ) < 14

0.1+0.6−0.4+0.9−0.4 (0.2σ) < 1.5

Decay mode Theoretical predictions

SU(3) flavour QCD fact.

B0 → η′K∗0 3.0+1.2−0.3 3.9+9.2−5.1B+ → η′K∗+ 2.8+1.2−0.3 5.1+10.3− 5.9B0 → η′ρ0 0.07+0.10−0.05 0.01+0.12−0.06B+ → η′ρ+ 4.9+0.7−0.7 6.3+4.0−3.3B0 → η′f0(→ π+π−)

Decay mode B(10−6)η′ η

B0 → η′K∗0 3.8 ± 1.1 ± 0.5 (4.5σ) B0 → ηK∗0 18.7 ± 1.7K∗

B+ → η′K∗+ 4.9+1.9−1.7 ± 0.8 (3.6σ) B+ → ηK∗+ 24.3+3.0−2.9B0 → η′K0 63.2 ± 3.3 B0 → ηK0 < 1.9

KB+ → η′K+ 69.4 ± 2.7 B+ → ηK+ 2.5 ± 0.3

Phys.Rev.D69,034001(2004)

Nucl. Phys. B675,333(2003)

(GeV)ESm5.25 5.26 5.27 5.28 5.29

Eve

nts

/ ( 0

.002

GeV

)

02468

1012141618

(GeV)ESm5.25 5.26 5.27 5.28 5.29

Eve

nts

/ ( 0

.002

GeV

)

02468

1012141618 BABAR

preliminary

*0 Kππη

’η


e.g.

)-6) (10*+’ Kη →BR(B0 2 4 6 8 10 12 14 16 18 20

) 0-2

ln (

L/L

0

5

10

15

20

25

30

)-6) (10*+’ Kη →BR(B0 2 4 6 8 10 12 14 16 18 20

) 0-2

ln (

L/L

0

5

10

15

20

25

30 BABARpreliminary

∆E

mES

NLL scan

NLL scan

Observation of B0 η’K*0, evidence for B+ η’K*+;significantly improved limits for the other modes

η’ηππK*0

η’ηππK*0

Β+ η’K*+

Β0 η’K*0


BaBar

ConclusionConclusion

Rare hadronic B decays continue to be a rich and active field of research and provide essential information on the details of hadronic interactions.

We keep looking for the needle in the haystack which could turn into a key to physics beyond the Standard Model.

Rare Hadronic B DecaysOutlineB→D(*)D(*) : MotivationB→D(*)D(*) : ResultsW Exchange Decays B0→D(*)s+D(*)s-Annihilation Decays BDS(*)Charm Production in Recoil: MethodCharm Production in Recoil: ResultsTesting Factorization with B0 D*wpBaryonic B DecaysCharmless B Decaysbqqs Penguin DecaysConstraining SM Pollution (I)Constraining SM Pollution (II)Avoiding SM Pollution: B0 Ks0Ks0KL0Search for Bη’r/K*Conclusion

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rare hadronic b decaysmoriond.in2p3.fr/qcd/2006/sundaymorning/kroseberg.pdf · 2006. 3. 18. ·...

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