-
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
-
Rare Hadronic B Decays J. Kroseberg (BaBar) Moriond QCD, March
19 '06 2SCIPP
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]
-
Rare Hadronic B Decays J. Kroseberg (BaBar) Moriond QCD, March
19 '06 3SCIPP
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
-
Rare Hadronic B Decays J. Kroseberg (BaBar) Moriond QCD, March
19 '06 4SCIPP
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
-
Rare Hadronic B Decays J. Kroseberg (BaBar) Moriond QCD, March
19 '06 5SCIPP
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
-
Rare Hadronic B Decays J. Kroseberg (BaBar) Moriond QCD, March
19 '06 6SCIPP
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
��������
�����
�
��� ��
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
212/fb, 234x106 BB pairs
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.
-
Rare Hadronic B Decays J. Kroseberg (BaBar) Moriond QCD, March
19 '06 7SCIPP
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
-
Rare Hadronic B Decays J. Kroseberg (BaBar) Moriond QCD, March
19 '06 8SCIPP
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.
-
Rare Hadronic B Decays J. Kroseberg (BaBar) Moriond QCD, March
19 '06 9SCIPP
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
211/fb, 232x106 BB pairs
BABARpreliminary
Also: ΓL/Γ=0.654 ±0.042 ±0.016 (from D* angular
analysis)consistent with predictions (factorization, HQET and
semi-lept. B decays)
-
Rare Hadronic B Decays J. Kroseberg (BaBar) Moriond QCD, March
19 '06 10SCIPP
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
-
Rare Hadronic B Decays J. Kroseberg (BaBar) Moriond QCD, March
19 '06 11SCIPP
BaBar
CharmlessCharmless B DecaysB Decays
-
Rare Hadronic B Decays J. Kroseberg (BaBar) Moriond QCD, March
19 '06 12SCIPP
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
__
__
-
Rare Hadronic B Decays J. Kroseberg (BaBar) Moriond QCD, March
19 '06 13SCIPP
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!
-
Rare Hadronic B Decays J. Kroseberg (BaBar) Moriond QCD, March
19 '06 14SCIPP
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
211/fb, 232x106 BB pairs
Similar for B η’ Ks :
B0 η’ ηππ π0
BABARpreliminary
datasignal MC (arbitrary scale)background MC sig.+bgrnd. MC
-
Rare Hadronic B Decays J. Kroseberg (BaBar) Moriond QCD, March
19 '06 15SCIPP
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 (
-
Rare Hadronic B Decays J. Kroseberg (BaBar) Moriond QCD, March
19 '06 16SCIPP
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
211/fb, 232x106 BB pairs
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
-
Rare Hadronic B Decays J. Kroseberg (BaBar) Moriond QCD, March
19 '06 17SCIPP
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
/ColorImageDict > /JPEG2000ColorACSImageDict >
/JPEG2000ColorImageDict > /AntiAliasGrayImages false
/DownsampleGrayImages true /GrayImageDownsampleType /Bicubic
/GrayImageResolution 300 /GrayImageDepth -1
/GrayImageDownsampleThreshold 1.50000 /EncodeGrayImages true
/GrayImageFilter /DCTEncode /AutoFilterGrayImages true
/GrayImageAutoFilterStrategy /JPEG /GrayACSImageDict >
/GrayImageDict > /JPEG2000GrayACSImageDict >
/JPEG2000GrayImageDict > /AntiAliasMonoImages false
/DownsampleMonoImages true /MonoImageDownsampleType /Bicubic
/MonoImageResolution 1200 /MonoImageDepth -1
/MonoImageDownsampleThreshold 1.50000 /EncodeMonoImages true
/MonoImageFilter /CCITTFaxEncode /MonoImageDict >
/AllowPSXObjects false /PDFX1aCheck false /PDFX3Check false
/PDFXCompliantPDFOnly false /PDFXNoTrimBoxError true
/PDFXTrimBoxToMediaBoxOffset [ 0.00000 0.00000 0.00000 0.00000 ]
/PDFXSetBleedBoxToMediaBox true /PDFXBleedBoxToTrimBoxOffset [
0.00000 0.00000 0.00000 0.00000 ] /PDFXOutputIntentProfile ()
/PDFXOutputCondition () /PDFXRegistryName (http://www.color.org)
/PDFXTrapped /Unknown
/Description >>> setdistillerparams>
setpagedevice