Newphysicssearches Newphysicssearches Newphysicssearches - - PowerPoint PPT Presentation

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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• nbehalfoftheBaBar

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

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

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

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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

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

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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

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

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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

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

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 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+

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 =

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 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

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

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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

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

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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

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

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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

−

− ±

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

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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

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

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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)

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

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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))

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

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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

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

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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

+ − − −

→ = → = ±

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

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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

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

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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

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

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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

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

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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 <

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

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Conclusions Conclusions Conclusions Conclusions Conclusions Conclusions Conclusions Conclusions

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

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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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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

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