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PHENO2009SYMPOSIUMMay10!13,2009,Madison Newphysicssearches Newphysicssearches


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elisamanoni university&infn perugia PHENO2009SYMPOSIUMMay10!13,2009,Madison

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Newphysicssearches Newphysicssearches Newphysicssearches Newphysicssearches Newphysicssearches Newphysicssearches Newphysicssearches Newphysicssearches atB atB atB atB atB atB atB atB! ! ! ! ! ! ! !factories factories factories factories factories factories factories factories

PHENO 2009SYMPOSIUM,May 10!13,2009,Madison

Elisa Elisa Elisa Elisa Elisa Elisa Elisa ElisaManoni Manoni Manoni Manoni Manoni Manoni Manoni Manoni

(Universityand (Universityand (Universityand (Universityand (Universityand (Universityand (Universityand (UniversityandINFN INFN INFN INFN INFN INFN INFN INFN Perugia Perugia Perugia Perugia Perugia Perugia Perugia Perugia) ) ) ) ) ) ) )

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  • nbehalfofthe
  • nbehalfoftheBaBar

BaBar BaBar BaBar BaBar BaBar BaBar BaBar collaboration collaboration collaboration collaboration collaboration collaboration collaboration collaboration

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elisamanoni university&infn perugia PHENO2009SYMPOSIUMMay10!13,2009,Madison

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Outline Outline Outline Outline Outline Outline Outline Outline

NewPhysicssearches:howto B!factoriesanddatasets kinematicsconstraintsandraredecaysearch BelleandBaBar resultson

B+→τ+ν

B0(+)→K(*)0(+)l+l!

B0(+)→K*0(+)νν

B0

s→ϕγ,γγ

Conclusions

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RaredecaysandNewPhysics RaredecaysandNewPhysics RaredecaysandNewPhysics RaredecaysandNewPhysics RaredecaysandNewPhysics RaredecaysandNewPhysics RaredecaysandNewPhysics RaredecaysandNewPhysics

  • 2complementaryapproachestodetectNewPhysics(NP)effects

“shakethebox”where..

NPeffectsareofthesameorderofSMcontributions

physicalquantitiesarepredictedwithsmalltheoreticaluncertaintiesintheSM

→ RAREDECAYBranchingFractions,ASYMMETRIES(ACP,AFB)

  • whatcanbelearnt:

claimevidenceforNP or constraintNPparametersif measurementsareinconsistent withtheSMexpectation 10!5 Bs

0→ϕγ

10!4 B+ →τ+ν 10!6 B0(+)→K*0(+)νν 10!6 B0(+)→K*0(+)l+l! O(BRSM) decay

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Belleand Belleand Belleand Belleand Belleand Belleand Belleand BelleandBaBar BaBar BaBar BaBar BaBar BaBar BaBar BaBar :detectorsanddatasets :detectorsanddatasets :detectorsanddatasets :detectorsanddatasets :detectorsanddatasets :detectorsanddatasets :detectorsanddatasets :detectorsanddatasets

Belle@KEK B!factory

Ee+ =3.5GeV,Ee! =8.0GeV Y(4S)boost:βγ

γ γ γ=0.425

Datasamples:

∼ 900fb!1 @Y(4S)→ 980MBB ∼ 23.6fb!1 @Y(5S)→ 2.8MBsBs (datatakingongoin) BaBar @PEPII B!factory

Ee+ =3.1GeV,

Ee! =9.0GeV

Y(4S)boost:βγ

γ γ γ=0.56

Datasample@Y(4S):

∼ 430fb!1 → 471MBB

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Ingredientstoraredecaysearches Ingredientstoraredecaysearches Ingredientstoraredecaysearches Ingredientstoraredecaysearches Ingredientstoraredecaysearches Ingredientstoraredecaysearches Ingredientstoraredecaysearches Ingredientstoraredecaysearches

HowtoExploitthekinematics

  • RECOILANALYSIS:

fullyreconstructoneBintheeventin semileptonic orhadronicmodes(Btag)andconstraintitskinematics

searchintherestoftheeventforthesignalsignature(Bsig)

→ usedwhenthereareundetectableparticlesinthe signalside;efficiencyO(10!2 ÷ 10!3),verycleansample

  • EXCLUSIVEANALYSIS:

reconstructthealltheBsig and decayproductsandconstraint itskinematics

→ higherefficiencyandbackgroundcontamination

Y(4S Y(4S Y(4S Y(4S) ) ) )

B B B Btag

tag tag tag

D D D D(*)

(*) (*) (*)

K K K K π π π π0

K K K K ν B B B Bsig

sig sig sig

ν

Y(4S Y(4S Y(4S Y(4S) ) ) )

B B B Btag

tag tag tag

1) 2)

*2 *2 ES beam B * B

m E p E E s / 2 ≡ − ∆ ≡ − K K K K B B B Bsig

sig sig sig

l

1)

l

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B B B B B B B B+

+ + + + + + +→τ

→τ →τ →τ →τ →τ →τ →τ+

+ + + + + + +ν

ν ν ν ν ν ν ν

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B B B B B B B B+

+ + + + + + +→τ

→τ →τ →τ →τ →τ →τ →τ+

+ + + + + + +ν

ν ν ν ν ν ν ν theoreticaloverview theoreticaloverview theoreticaloverview theoreticaloverview theoreticaloverview theoreticaloverview theoreticaloverview theoreticaloverview

SMpredictions:

fB =216± 22MeV (A.Grayetal.[HPQCD Collaboration],Phys.Rev.Lett.95212001(2005)) |Vub|=(4.39± 0.33)x10!3 (E.Barberio etal.(HeavyFlavorAveragingGroup)(2006))

NPmodels − SUSY :chargedHiggs canmediatetheannihilation

2 2 2 2 2 F B SM B ub B 2 B

G m m m (B ) 1 f |V | 8 m

+ + τ τ

  → τ ν = − τ   π  

  • 2

2 exp 2 B 2 SM H

(B ) m 1 tan (B ) m

+ + + +

→ τ ν   ≈ − β   → τ ν  

  • (W.S.Hou

Phy.Lett.D48,2342 (1993))

!4 SM

(B ) =(1.59 0.40)x10

+ +

→ τ ν ±

  • H+
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elisamanoni university&infn perugia PHENO2009SYMPOSIUMMay10!13,2009,Madison

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B B B B B B B B+

+ + + + + + +→τ

→τ →τ →τ →τ →τ →τ →τ+

+ + + + + + +ν

ν ν ν ν ν ν ν intheSLrecoil intheSLrecoil intheSLrecoil intheSLrecoil intheSLrecoil intheSLrecoil intheSLrecoil intheSLrecoil

  • B!

tag →D(*)0l!ν,l=e,µ

vs B+

sig →τ+ν

backgroundsuppressionbyusingeventshapeandkinematicalvariables mostdiscriminat variable:extraneutralenergyinthecalorimeter neither

associatedtoBsig nortoBtag (Eextra)

Results:

τ+ν e+νν,µ+νν π+νν,ρ+(π+π0)ν

BaBar only arXiv:0809.4027 417.6fb!1 arXiv:0809.3834 605fb!1

4

(B ) (1.8 0.8 0.1)x10

+ + −

→ τ ν = ± ±

  • 0.38 0.35

4 0.37 0.37

(B ) (1.65 )x10

+ + + + − − −

→ τ ν =

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B B B B B B B B+

+ + + + + + +→τ

→τ →τ →τ →τ →τ →τ →τ+

+ + + + + + +ν

ν ν ν ν ν ν ν andphenomenologicalc andphenomenologicalc andphenomenologicalc andphenomenologicalc andphenomenologicalc andphenomenologicalc andphenomenologicalc andphenomenologicalconstraints

  • nstraints
  • nstraints
  • nstraints
  • nstraints
  • nstraints
  • nstraints
  • nstraints
  • HPQCD05
  • 4

EXP

(B ) (1.51 0.34)x10

+ + −

→ τ ν = ±

  • !4

SM

(B ) =(1.59 0.40)x10

+ +

→ τ ν ±

  • (HFAG BaBar +Belleaverage,Summer2008)

+0.18 !4 SM fit !0.08

(B ) =(0.79 )x10

+ + −

→ τ ν

  • T.Lijima @Hints09

Vub tensionbetweenmeasuredresultandfitestimate

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B B B B B B B B→ → → → → → → →K K K K K K K K(*)

(*) (*) (*) (*) (*) (*) (*)ll

ll ll ll ll ll ll ll

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B B B B B B B B→ → → → → → → →K K K K K K K K(*)

(*) (*) (*) (*) (*) (*) (*)ll

ll ll ll ll ll ll ll theoreticaloverview theoreticaloverview theoreticaloverview theoreticaloverview theoreticaloverview theoreticaloverview theoreticaloverview theoreticaloverview

OperatorProductExpansionframework:3effectiveWilsoncoefficients

governtheb→sll process

C7 :electromagneticpenguin(modulus fromb→sγ/sll,signfromb→sll)

C9 :vectorpartofelectroweakdiagrams

C10 :axial!vectorpartofelectroweakdiagrams

→ NPcanchangemagnitudeandrelativesign ofCi wrt SMpredictions

Allthefollowingresultsfrom:

PRL 102,091803(2009),PRD 79,031102(2009),350fb!1 → 384MBB

arXiv:0810.0335 ,597fb!1 → 657MBB

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  • e+e!/
  • +
  • ! pair+{K+,Ks,K+π

π π π!,K+π π π π0,Ksπ π π π+}

  • signalwindowdefinedbymES,∆

∆ ∆ ∆E andm(Kπ π π π)forK*

  • vetoB→(cc)Xs bycuttingon q2=mll

→ Belle(BaBar)fitsin 6(2)q2 bins halfthebinsinthelow!q2 regionandthe

  • therhalfinthehigh!q2 region
  • agreementbetweenthetwoexperiments
  • agreementwith SMexpectation

! theoreticalerror∼ 30%

B B B B B B B B→ → → → → → → →K K K K K K K K(*)

(*) (*) (*) (*) (*) (*) (*)ll

ll ll ll ll ll ll ll :signalyieldandbranchingfraction :signalyieldandbranchingfraction :signalyieldandbranchingfraction :signalyieldandbranchingfraction :signalyieldandbranchingfraction :signalyieldandbranchingfraction :signalyieldandbranchingfraction :signalyieldandbranchingfraction

B→K*ll B→Kll

data(dots); data(dots); data(dots); data(dots); signal; signal; signal; signal; peaking peaking peaking peaking; ; ; ; hadronic hadronic hadronic hadronic; ; ; ; combinatorial combinatorial combinatorial combinatorial; ; ; ; total total total total B+→K*+ll

relativeexpuncertainties: ∼ 13%(Belle) ∼ 18%(BaBar)

0.05 6 0.04

(0.48 0.03)x10

+ − −

±

6

(0.39 0.07 0.02)x10− ± ±

0.11 6 0.10

(1.08 0.09)x10

+ − −

±

0.19 6 0.18

(1.11 0.07)x10

+ − −

±

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  • predictedtobeO(10!3) bothforKandK*intheSM;

enhancementupto10% ingenericNPscenarios (Bobethet al.,JHEP0807,106(2008))

experimentalresultsinthecombinedq2 region:

consistentwithnulldirectCPviolation

B B B B B B B B→ → → → → → → →K K K K K K K K(*)

(*) (*) (*) (*) (*) (*) (*)ll

ll ll ll ll ll ll ll :directCPasymmetry :directCPasymmetry :directCPasymmetry :directCPasymmetry :directCPasymmetry :directCPasymmetry :directCPasymmetry :directCPasymmetry

(*) (*) CP (*) (*)

(B K l l ) (B K l l ) A (B K l l ) (B K l l )

+ − + − + − + −

Γ → − Γ → ≡ Γ → + Γ →

K*l+l! K*+l+l! K*0l+l! K+l+l!

0.20 0.20

0.02 0.02

±

0.18 0.18

0.18 0.01

− ±

0.26 0.24

0.01 0.02

±

0.16 0.15

0.01 0.01

±

0.10 0.10

0.04 0.02

− ±

0.12 0.12

0.08 0.02

− ±

0.17 0.16

0.13 0.01

− ±

0.10 0.10

0.10 0.01

− ±

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B B B B B B B B→ → → → → → → →K K K K K K K K(*)

(*) (*) (*) (*) (*) (*) (*)ll

ll ll ll ll ll ll ll :LeptonFlavorRatio :LeptonFlavorRatio :LeptonFlavorRatio :LeptonFlavorRatio :LeptonFlavorRatio :LeptonFlavorRatio :LeptonFlavorRatio :LeptonFlavorRatio

(*)

(*) (*) K

(B K ) R (B K e e ) µ µ

+ − + −

Γ → ≡ Γ →

intheSM:

RK ∼ 1, RK*∼ 1(0.75includingtheq2<2mµ regionwheretheechannelisenhanced);

  • SUSY withlargetanβ :enhancementupto10%(Higgspreferentiallycouplestoµ)

(Yan al.,Phys.Rev.D62,094023(2000)) experimentalresults:

consistencybetweenthetwoexperimentandagreementwiththeSMprediction 1.10+0.42

!0.32±0.07

0.82±0.17±0.01 RK* 0.56+0.29

!0.23±0.04

RK* (includingq2<(2mµ)) 0.96+0.44

!0.34±0.05

1.03±0.19±0.06 RK

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B B B B B B B B→ → → → → → → →K K K K K K K K(*)

(*) (*) (*) (*) (*) (*) (*)ll

ll ll ll ll ll ll ll : : : : : : : :Isospin Isospin Isospin Isospin Isospin Isospin Isospin Isospin Asymmetry Asymmetry Asymmetry Asymmetry Asymmetry Asymmetry Asymmetry Asymmetry

(*)

(*)0 (*) K I (*)0 (*)

(B K l l ) ( / ) (B K l l ) A (B K l l ) ( / ) (B K l l ) τ τ τ τ

+ − ± ± + − + + − ± ± + − +

Γ → − Γ → ≡ Γ → + Γ →

SMexpectation:verysmallasymmetry,

reachesO(%)atlowestq2

experimentalresults:

noisospin violationathighq2

atsmallq2 ! significance from null AI(B→K(*)ll):σ =2.24 ! difference fromnullAI(B→K(*)ll):3.9σstat+syst

!0.30+0.12

!0.11±0.04

AI(B→K(*)ll) !0.31+0.17

!0.14±0.05

AI(B→Kll) !0.29±0.16±0.03 AI(B→K*ll) !1.43+0.56

!0.85±0.05

AI(B→Kll) !0.56+0.17

!0.15±0.03

AI(B→K*ll)

Feldmann andMatias, JHEP0301,074(2003)

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B B B B B B B B→ → → → → → → →K K K K K K K K* * * * * * * *ll ll ll ll ll ll ll ll :angular :angular :angular :angular :angular :angular :angular :angularfits(I fits(I fits(I fits(I fits(I fits(I fits(I fits(I) ) ) ) ) ) ) )

θK :anglebetweenKandBin K*restframe fittocosθK: → determinationofFL

2 2 L K L K

3 3 F cos (1 F )(1 cos ) 2 4 θ θ + − −

0.11±0.09 0.53±0.14 Belle 0.71+0.20

!0.22

0.35±0.16 BaBar Highq2 Lowq2 FL SMC7=!CSM

7

  • longitudinalK*polarization FL :

sensitivetoNPatlowq2

(Krüger etal.PRD 71,094009(2005))

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  • forward!backwardasymmetry :
  • experimentalresults :

2 * 1 l l 1 l FB *

d (B K l l ) dcos Sign(cos ) dcos ds A (s) d (B K l l )/ds θ θ θ

+ − − + −

Γ → = Γ →

(s≡q2/m2

B ,θl anglebetweenl+(l!)andB(B)inll restframe)

B B B B B B B B→ → → → → → → →K K K K K K K K* * * * * * * *ll ll ll ll ll ll ll ll :angularfits(II) :angularfits(II) :angularfits(II) :angularfits(II) :angularfits(II) :angularfits(II) :angularfits(II) :angularfits(II)

Alietal.PRD61,074024(2000) Buchalla etal.PRD63,014015(2001) Alietal.PRD66,034002(2002) Krüger etal.PRD 61,114028(2002) Krüger etal.PRD 71,094009(2005)

0.58±0.11 0.30±0.15

Belle

0.76+0.52

!0.32

0.24+0.18

!0.23

BaBar Highq2 Lowq2 AFB

SM C7=!CSM

7

C9C10=!CSM

9CSM 10

C7=!CSM

7 C9C10=!CSM 9CSM 10

fittocosθl: → determinationofAFB

2 L l 2 L l FB l

3 F (1 cos ) 4 3 (1 F )(1 cos ) 8 A cos θ θ θ − + − + +

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B B B B B B B B→ → → → → → → →K K K K K K K K*

* * * * * * *νν

νν

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B B B B B B B B→ → → → → → → →K K K K K K K K(*)

(*) (*) (*) (*) (*) (*) (*)νν

νν:theoreticaloverview :theoreticaloverview :theoreticaloverview :theoreticaloverview :theoreticaloverview :theoreticaloverview :theoreticaloverview :theoreticaloverview

  • b→sνν diagramsintheSMmodel
  • SMprediction:
  • NPeffects:

Non!standardZcoupling:enhancementofafactor10

Newsourcesofmissingenergy:productionoflightdarkmatter viaHiggs mediatedvertex,BRNP up50xBRSM

G.Altmannshofer etal., arXiv:0902.0160 C.Birdetal.Phys.Rev.Lett.93:201803 (2004) G.Buchalla etal.Phys. Rev.D63,014015(2000)

1.0 6 SM 1.1 6 SM

BR (B K* ) (6.8 )x10 BR (B K ) (4.5 0.7)x10 νν νν

+ − − −

→ = → = ±

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B B B B B B B B→ → → → → → → →K K K K K K K K*

* * * * * * *νν

νν fromBelle:analysisstrategy fromBelle:analysisstrategy fromBelle:analysisstrategy fromBelle:analysisstrategy fromBelle:analysisstrategy fromBelle:analysisstrategy fromBelle:analysisstrategy fromBelle:analysisstrategy

  • Belle:inclusivereconstructionofBtag in hadronicchannels (B→D(*)nKmπ)

BaBar:combinedresultsfromthesemileptonic andhadronic recoilanalyses

492fb!1 Phys.Rev.Lett.99:22180(2007)

K K K K*+

*+ *+ *+→

→ → →K K K Ks

s s sπ

π π π+

+ + +

K K K K*0

*0 *0 *0→

→ → →K K K K+

+ + +π

π π π!

8x10!5 B→K*νν 12x10!5 8x10!5 Combined 18x10!5 9x10!5 SL 11x10!5 21x10!5 HAD B0→K*0νν B+→K*+νν UL@90%CL PRD 78,072007(2008),413fb!1

34x10!5 14x10!5 B0→K*0νν B+→K*+νν

SL analysis HAD analysis

UL@90%CL

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B B B B B B B B→ → → → → → → →K K K K K K K K* * * * * * * *νν νν νν νν νν νν νν νν andlightdarkmatter andlightdarkmatter andlightdarkmatter andlightdarkmatter andlightdarkmatter andlightdarkmatter andlightdarkmatter andlightdarkmatter

  • lightscalardarkmattercandidateS (mS <2.5GeV)

b→s SStransitionmediatedbyaHiggsboson(h) withcouplingλ forlowmS,κ∼O(1)(Burgessetal.Nucl.Phys.B619,709(2001))

  • UsethemeasuredULtoconstraintmS vs κ

useBaBar ULandBuchalla etal PRD 63,014015forSMprediction

forhighκ:lighthiggs withstrongcouplingtoSS → h→SS cansaturatethehiggs decay ratemaking impossibletheHiggsdiscoveryatLHC

4 2 2 h

100GeV m κ λ   =    

relatedtothedark matterabundance intheuniverse mh =Higgsmass

excluded@ 95% CL excluded@ 68% CL

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B B B B B B B B0

s s s s s s s s→

→ → → → → → → ϕγ ϕγ ϕγ ϕγ ϕγ ϕγ ϕγ ϕγ, , , , , , , ,γγ γγ γγ γγ γγ γγ γγ γγ

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B B B B B B B Bs

s s s s s s s →

→ → → → → → → ϕγ ϕγ ϕγ ϕγ ϕγ ϕγ ϕγ ϕγ, , , , , , , ,γγ γγ γγ γγ γγ γγ γγ γγ:theoreticaloverview :theoreticaloverview :theoreticaloverview :theoreticaloverview :theoreticaloverview :theoreticaloverview :theoreticaloverview :theoreticaloverview

B0

s → ϕγ

  • SMprediction:BR(Bs→φγ)∼ 40x10!6

with30%theoreticaluncertainty (BalletalPhys.Rev.D75,054004 AlietalEur.Phys.J.C55:577!595)

  • isitconsistentwiththetheoretical

predictionforb→sγ transition,asinthe Bd sectoris ?

B0

s → γγ

  • SMprediction:BR(Bs→γγ)∼(0.5!1.0)x10!6

(ChangetalPhys.Lett.B 451,395 Reina etalPhys.Rev.D56,5805 BoschetalJ.HighEnergyPhys.08,054)

  • severalNPmodelscanenhanceBRwrt

SMupto1orderofmagnitude

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B B B B B B B B0

s s s s s s s s →

→ → → → → → → φγ φγ φγ φγ φγ φγ φγ φγ, , , , , , , ,γγ γγ γγ γγ γγ γγ γγ γγ:results :results :results :results :results :results :results :results

ExperimentalsearchesperformedusingBelleY(5S)datasample B0

s → ϕγ

Nsig =18+6

!5

  • → firstobservationofradiative Bs

decay

CompatiblewithSMexpectation

B0

s → γγ

Noevidenceforsignal UL@90%CL: ∼ 10xSMexpectation

23.6fb!1 Phys.Rev.Lett.100:121801(2008)

Bothlimitedbystatistics

18 12 6 s 15 11

(B ) (57 )x10

+ + − − −

→ ϕγ =

  • 6

s

(B ) 8.7x10− → γγ <

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Conclusions Conclusions Conclusions Conclusions Conclusions Conclusions Conclusions Conclusions

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Conclusions Conclusions Conclusions Conclusions Conclusions Conclusions Conclusions Conclusions

Searchforraredecays:testfortheStandardModelandprobefor

NewPhysics

HighstatisticsandcleandatasamplesprovidedbyB!factories

indirectsearchforNP

complementary todirectsearch@highenergymachines

reachedsensitivityO(10!7)

ExperimentalmeasurementsallowtoconstraintparametersdefiningNP MuchmorecanbedoneatLHCb andataSuperFlavorFactory

  • nlyplacewherefurthersearchesforraredecayswithundetectable

particlesarefeasible

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back back back back back back back back! ! ! ! ! ! ! !upslides upslides upslides upslides upslides upslides upslides upslides

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V V V V V V V Vub

ub ub ub ub ub ub ub tension(2007)

tension(2007) tension(2007) tension(2007) tension(2007) tension(2007) tension(2007) tension(2007)

|Vub| [x10-3]

Br(τν) [x10 ]

  • 4

|Vub|fromCKM fit (meas.notinfit) Br=(3.64+0.19!0.18)x10!3 |Vub|fromSL Br=(4.39+/! 0.33)x10!3 Belleresult: Br=(1.79+0.72!0.71)x10!4 SMformulaw/ fB =0.216+/! 0.022GeV

Toru Iijima @ Hints09

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elisamanoni university&infn perugia PHENO2009SYMPOSIUMMay10!13,2009,Madison

29

V V V V V V V Vub

ub ub ub ub ub ub ub tension(2009)

tension(2009) tension(2009) tension(2009) tension(2009) tension(2009) tension(2009) tension(2009)

|Vub|fromCKM fit (meas.notinfit) Br=(3.51+/!0.15)x10!3 |Vub|fromSL Br=(4.32+0.36!0.31)x10!3 Belle/BaBar average: Br=(1.51+/!0.33)x10!4 SMformulaw/ fB =0.223+/! 0.024GeV

Goodprogres inexperiments!

Toru Iijima @ Hints09

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elisamanoni university&infn perugia PHENO2009SYMPOSIUMMay10!13,2009,Madison

30

Inclusivesearchfor Inclusivesearchfor Inclusivesearchfor Inclusivesearchfor Inclusivesearchfor Inclusivesearchfor Inclusivesearchfor InclusivesearchforB B B B B B B B+

+ + + + + + +→

→ → → → → → →l l l l l l l l+

+ + + + + + +ν

ν ν ν ν ν ν ν

  • Bsig =1withhighestmomentumlepton (tightparticleID)+Btag =extratracksandneutral
  • backgroundsuppression:

Btag ∆EandpT (Belleolny),Fisherdiscriminat tosuppressqq background,directionand moduleofthetransversemissing3!momentum(BaBar only) → mainbackgroundleft:qq,B→Xulν,Xh withmisidentifiedh,two!γ eventsfortheelectronch.

  • yieldextraction:

fittoBtag mES (Belle)or2!dimfit toBtag mES andpFIT =a0+a1pl

CM+a2 pl REST (BaBar)

426fb!1 arXiv:0903.1220 253fb!1 Phys.Lett.B,647,67(2007)

(Lumi &Ref) B→µν B→eν B→µν B→eν 1.0x10!6 1.9x10!6 9.8x10!6 1.7x10!6 UL90% 1.4±17.2 17.9±17.6 4.1±3.3 !1.8±3.3 Nsig (6.1±0.2)% (4.7±0.3)% (2.2±0.1)% (2.4±0.1)% εsig BaBar Belle

B→eν B→τν