B-Factories: Physics Reach

B-Factories: Physics Reach

Luminosity

CPV and CKM

Rare B decays

Conclusions

Livio Lanceri – Univ. and INFN TriesteINFN-CSNI – LNF, February 4, 2003

February 4, 2003 L.Lanceri - B-Factories: Physics Reach - CSNI 2

Discovery potential at the B factories• CKM and Unitarity Triangle

– SM predicts a pattern of CPV, from phase in the CKM matrix– B factories can measure both angles and sides of the

Unitarity Triangle– New phases from New Physics may reshape the UT

• Rare B Decays– CKM suppressed (tree b u), Radiative Penguins (QCD, EM,

EW), leptonic B decays– Common feature (Penguins, leptonic): New Physics

signatures from rates and asymmetries (new virtual particles in the loops)

• Charm, tau– Examples: D mixing and lepton number violating decays– Very small in SM windows for New Physics


Asymmetric B factories optimized for measurements of time-dependent CP violating asymmetries

OK also for other measurements (rare B decays, …)Open trigger! No B physics losses at trigger levelHigh efficiencies, small bkgdUnique tool at B factories: exclusive B tagging with fully rec. B (“single B beam”)Luminosity is a key factor

Experimental ingredients

z(CP)z(tag)

Inclusive tag (lepton, K, …): tag(1-2w)2 28%

00)4( BBsee

ctagzCPzt )()(

rec 1540%

(Exclusive tag: tag 0.10.2%)

28.0;nb1 had

bbbb

< z > 260 mz (RMS) 190 m


B-Factories: experiments and luminosityBABAR/PEP-II• Record peak luminosity:

– 4.6 x 1033cm-2s-1 (~5 BB/s)

• max lumi/24h: 303 pb-1

• total recorded lumi to date: ~0.1 ab-1 (~10% off-peak)

• Restarted end Nov.2002 after 4 months shutdown (Forward IFR upgrade)

Belle/KEK-B• Record peak luminosity:

– 8.2 x 1033cm-2s-1 (~8 BB/s)

• max lumi/24h: 433 pb-1

• total recorded lumi to date: ~0.1 ab-1 (~10% off-peak)

• Restarted in January 2003 after vacuum loss forced stop in December

c.f. integrated luminosity for •Argus (1983-1987): ~100 pb-1

•CLEO (1981-2000): ~16 fb-1


0

200

400

600

800

1000

1200

Year

Inte

grat

ed L

umin

osity

( fb

-1)

0

5

10

15

20

25

30

Peak

Lum

inos

ity [1

0**3

3]

Yearly Integrated Luminosity [fb-1]

Cumulative Integrated Luminosity [fb-1]

Peak Luminosity [10**33]

Yearly Integrated Luminosity [fb-1] 3 23 41 39 62.6 66.1 120.1 151 160.1 217 216

Cumulative Integrated Luminosity [fb-1] 3 26 67 106 168.6 234.7 354.8 505.8 665.9 882.9 1098.9

Peak Luminosity [10**33] 1 2 4.4 5 7.5 10 13 16 20 22 25

1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009

PEP-II without upgrades

0.5 ab-1

2006

1.6 x 1034

integrated

peak

2009

1.1 ab-1


PEP-II upgrade scenariosFrom J.Seeman/SLAC

New IR, present rings New IR, New LER, Constant LER injection

New IR, New rings, Constant injection

# bunches 1700 3400 3400 Beam currents HER: 2A, LER: 4.5A HER: 2A, LER: 24.5A HER: 8.5A, LER:24.5A IP functions x: 18cm, y:0.45/0.5cm x: 15/23cm, y: 0.4cm x: 15cm, y: 0.15cm Beam-beam 0.075 0.075 0.112 Luminosity (cm-2 s-1) 4 1034 1 1035 1 1036

NO

(Super-KEKB?)

SuperPEP/SuperBaBar

Year 20...?New collider,(and new detector…)Snowmass: 370M$

Minimal upgrade

Feasible from 2005Shut-down 3 months0.40.5 ab-1/yearLimited cost

2ab-1

in 2009


Path to higher PEP-II luminosity

Luminosity 4.6E331E34 2E34 4E34 UnitsI+ 1800 2700 3600 4500 mAI- 950 1400 1760 2000 mABeta y* 11.5 9 7 4.5 mmBeta x* 50 50 50 50 cmBunch Length 1.3 1.0 0.8 0.5 cm# bunches 792 1300 1500 1600Vert. Emitt. 2.5 1.4 1.1 0.7 nmHoriz. Emittance40/50 30/45 32/47 40/48 nm (+/-)Crossing angle 0 0 0 ~+/-8 mradTune shifts (x/y) 7.5/4.58.0/5.78.2/6.08.4/6.3x100Number RF stations 7 10 13 15Date hardware ready Jan 02 Dec 02Dec 04Nov 05Date for luminosity Jun 02 July 03 Dec 05Dec 06

(J.Seeman, BaBar Collaboration meeting, Sept.2002)


For the 4x1034 PEP-II upgrade:We studied the physics reach in some channels for:

0.5 ab-1 (2006), 2.0 ab-1 (end of the decade)

And: Interest/need of an accompanying BaBar detector upgrade ?

(Conclusion: only Barrel IFR)

Most extrapolations reported here come from the preliminary report of the TF

BaBar Long Term Planning TF


EoI (January 2002): Super KEK-B, L = 1035cm-2s-1

- LER: e- , I = 10A; HER: e+, I = 3A Linac upgrade (e- e+)- Vacuum system (ante chambers); RF system (52 cavities,

12SC)- 15 mrad crossing, final focussing

Total cost (KEK-B + Belle): 400 M$

EoI preliminary plan:

Present plans: … ??Workshop at KEK, Feb.2003

What about KEK-B/Belle upgrades ?

year activity By mid 2006 500 fb-1 mid 2002 - mid 2006 Construction mid 2006 - 2007 Installation 2008 Commissioning > 2008 1 ab-1 / year

CPV and CKM: phases

sin2

sin2


CPV in mixing-decay interference direct CPV

dN exp(–|t|/B) ( 1 ± D (S sin(mt) - C cos(mt)) ) R

CP asymmetry: Time Dependence

2

2

2 1

1

12

CS

Amplitude ratio B0fcp/B0fcp

CP eigenvalueMi

tdtb

tdtb eVVVV

pq 2

*

*

B mixing

Measured from data (Flavour sample)!D mis-tag dilutionR time resolution

Flavour tag


BaBar, sin2results

11

CP

CP

sccb

sin2 = 0.741 0.067 0.034

sin2 = 0.755 0.074 sin2 = 0.723 0.158

12609.025.098.013.043.031.0

20303.022.010.003.034.002.0

4009.041.038.016.049.005.0

5109.019.02sin

**

0

0

52.050.0

0

DD

CSK

CSJ

K

S

S

030.0051.0948.0

2sin

Charmonium modes

Modes with Penguins Yield

2sinS in Standard Model

on-peak: 81.9 fb-1

off-peak: 9.6 fb-1

89 M BB pairstagged CP sample: 2631flavor sample: 25375

(pure Penguin!)


BaBar, sin2systematics decays with charmonium:

0.034Total0.003md

0.004B lifetime

0.010Fit bias correction

0.012Signal Dilutions

0.017t meas. and RF

0.015Klong BG

0.017

0.008

CP and Mix BG

DCS decays, tag side

sin2Source0.004

0.008

0.003

0.010

0.010

0.003

0.003

0.0030.018

Asymptotic

Using onlylepton tags:

0.01


sin2: projected errors (BaBar)• Extrapolated statistical and systematic

uncertainties

Statistical uncertaintyFor “golden” modes only

Param. Channel (stat)/(syst) 0.08 ab-1

(stat)/(syst) 0.5 ab-1


sin2 Im(+) S S S

J/KS Golden D*D* J/0 KS ’ KS

0.08 / 0.03 0.07 / 0.03 0.43 / 0.13 0.49 / 0.16 0.50 / 0.09 0.34 / 0.03

0.037 / 0.018 0.031 / 0.018 0.16 / 0.07 0.20 / 0.20 / 0.14 /

0.018 / 0.018 0.015 / 0.018 0.08 / 0.03 0.10 / 0.10 / 0.07 /

21 L1

syststat ab2at L


sin2eff from B0+-

b

d d

ud

u

+

-

B0Mixing + T:

b

d d

d

u

u -

+

t

B0

P:

2 1 /

1 /

2effsin(

sin(

)1 2

)

i i

i iP T e e

P T e eie

C

C

S

Observables in +-CP asymmetry (time-dependent) Extra weak phase –

strong phase , and |P/T|, modify by

eff 22 : from isospin analysis


BaBar and Belle: S and C With incomplete information (no isospin analysis):• Measure S and Cfrom both

sinmt and cosmt terms .• Compare with predicted S and

Cvalues for given , , |P/T|, and . Assume for instance:

22

3021

28.0/26

)97(

TP

cf. Gronau and Rosner, Phys. Rev. D65, 093012 (2002)

BABAR

Belle 1

Belle 2


Results (0.08 ab-1)

Param. Channel (stat)/(syst) 0.08 ab-1



S C

+-

0.34 / 0.05 0.25 / 0.04

0.12 / 0.03 0.10 / 0.03

0.06 / 0.05 /

Results and extrapolations for sin2eff

Extrapolated errors (BaBar)

Param. BaBar Belle S C

0.02 0.34 0.05 -0.30 0.25 0.04

-1.23 0.41 (+ 0.05-0.07) -0.77 0.27 0.08


sin2: isospin analysis (Gronau & London)

Mode Yield BR (10-6) AB→

B →

2321125 10

1.00.95.5 0.6

0.180.170.03 0.02

eff 22

10923

)%90(6.3 CL6.03.0

7.06.06.1

Need flavor tagged rates for+-, 0, 00

BaBar:


Upper bounds on = 2eff-2

0

0002

BFBFsin

BB

Grossman-Quinn bound: BaBar, present data: 051

BaBar, extrapolations:vs BF(00), at fixed Luminosity

Small gainwith lumi

Most powerful at small BF


Isospin analysis: projections - 1• Sensitivity to : toy MC with BaBar detector• Assumptions (example):

L = 0.5 ab-1 L = 2.0 ab-1

BR(B) = 4.1x10-6

BR(B0) = BR(B0) = 4.7x10-6

NB: 4-fold ambiguity !

<BR(B)> = 2.0x10-6


Isospin analysis: projections - 2• BaBar sensitivity on : summary

– (4-fold ambiguity not included)

• Assumptions: 00 reconstruction efficiency: rec = 0.18– For each B tagging category:

• Tagging performance , D = 1-2w• Bkgd effective cross sect. B (106)

Model BF 106 B 00

BF 106 Bbar 00

() 0.5 ab-1

() 2.0 ab-1

() 10 ab-1

A B C (no bkgd) D

2.5 1.5 2.5 0.6

1.5 0.5 1.5 0.4

0.409 0.452 0.286 0.436

0.177 0.258 0.106 0.316

0.075 0.132 0.045 0.175

Tag

D B

1 0.09 0.93 2.02 0.16 0.82 4.03 0.20 0.56 5.04 0.20 0.41 6.0


Quasi-2-body B0 analysis

3433413

N

Acp

0.080.080.22 ( ) 0.07( )CPA stat syst

0.180.19

0.250.25

0.45 ( ) 0.09( )

0.16 ( ) 0.07( )

C stat syst

S stat syst

hep-ex/0207068

81.9 fb-1


3-body (+-0) Dalitz analysis for

B0+ – - B00 0 Interference

Region

B0+ – - B0 – + Interference

Region

00

00

, ,, ,

A A AA A A

11 parameters (“fundamental”):

remove overall phase & normalization: 9 parameters

00, , , , ,T P T P T

Suffers from mirror solutions

No mirror solutions. Does not depend on particular weak phase decomposition

10 parameters (“amplitudes”):

remove overall phase & normalization: 8 parameters

obtain fundamental parameters from subsequent fit.

…work in progress


at the B factories• sin(2) from fully/partially reconstructed B

D(*)– Analysis in progress

• Rates and asymmetries in B K, KK– Require theoretical assumptions

• Promising developments: 3-body decays, Dalitz analysis (work in progress)– B D(*)K(*), D(*)Ks, DKs, D(*)K(*), …

• Most advanced analysis in BaBar: B-D0(CP)K-

– Sensitivity extrapolations from preliminary results

0.1.2sin

0.1.2sin

yyxx

81.2 fb-1 ev.897195

ev.1008058*

D

D


from B-D0(CP)K-

)(21000 DDD 1||)(

0 ieAKDBA

ii eeAKDBA 2||)( 0

)( *uscbVV

)( *csubVV

(Gronau-London-Wyler)

)cos(2

1)()( 2

0

11

rrKDBKDBn

)cos(2

1)()( 2

0

11

rrKDBKDBp

)cos(2

1)()( 2

0

22

rrKDBKDB

n

)cos(2

1)()( 2

0

22

rrKDBKDBp

Observables: n1, p1, n2, p2

Theor. parameters: , r,

)1.0(

)()(

0

0

O

KDBAKDBAr


r=0.2 (2ab-1), sin2fit: sin2

from B-D0(CP)K-: projections

Recent experimental results (BaBar)

Toy MC projections:(Fit unreliable for r = 0.1)

02.029.002.1)()(

0

11

KDBKDBn

)02.026.072.0()()(

0

11

KDBKDBp

r=0.3 (0.5 ab-1), sin2fitsin2

08.023.017.0 CPA

ACP=0.174 0.031

r=0.2 =60o =30o

(2ab-1)

KKD0500

CKM Triangle: sides

Vcb (Vub) (u)

(,…)|Vtd/Vts|2


|Vub| from fully tagged SL decays

Brecoil

BrecoD(*)

Y(4S) l

Xu

Semileptonic decayson the recoil of fully rec. B (~1KB0 /fb-1,~2KBch. /fb-1)

To separate bulMX (< MD)( ~ 60-80%)(or other variables:P*l, q2)


projected errors for |Vub|Selection:

One B reconstructed in D(*)XLepton momentum and neutrino massKaon veto, charge balanceFit Mx with constraints

MX distribution fit: bul, bcl, background

Errors:Statistical L(ab-1) = 0.08 0.5 2.0 10 stat(%) = 7.0 2.8 1.4 0.6

Experim. Systematic ~5% (now) 2.5% (bcl bkgd)

Theoretical ~ 9% ((mb)=90MeV) 5% (bulabove cut)Mx cut, b quark Fermi motion from b s, Mx binsFurther improvements from lattice QCD, restricted phase space

Mx (GeV)


Towards Vtd/Vts

10% error due to long range effectsto be compared to 6% for md/ms

From experience gained with present data 6

60600

103.2)(B

102.1)(B,104.1)(B

Br

BrBr

Significant gain if one can reduce the background by factor 2

0.5 ab-1

0.5 ab-1

2 ab-1

2 ab-1

Extrapolation

Rare B decays

bu tree QCDpenguin

EMpenguin

EWpenguin

leptonic


Charmless decays: Direct CP violation?Time-integrated CP asymmetries:No evidence for direct CPV yetTheoretical expectations:Tree + Penguin: ACP 10%Pure Penguin: ACP 1%

Present sensitivity (most channels)statACP 10% systACP 12%

Charge asym.


EW Penguins (BaBar): 85M BB pairs

60.110.240.180.20 10)(0.78)lKl(B

B

C.L. 90% @103.0

100.28)(1.68)llK(B6

60.680.58

*

B

Preliminary

Exclusive measurements:

Inclusive (bsl+l-)in progress

Remaining neutral Energy (GeV)

m(D

0 )Rec

-m(D

0 )PDG (

m(D

0))

SignalBox

Sideband

Theory (SM): B(B+K+) 3.8 x 10-6

56M BB pairs, fully reco. SL tag

B(B+K+) 9.410-5 (90% CL) 2 events observed (2.2 bkgd expected)


Leptonic decays (BaBar)• Already published, to be updated (Run1+2)

– BF(B ) < 1.7 10-6 (90% CL); int.lumi. 19.4 fb-1

• ICHEP 2002 (Run1+2):– BF(B e+e-) < 3.3 10-7 , BF(B +-) < 2.0 10-7 ,– BF(B +e-) < 2.1 10-7 (90% CL)

• New analyses on B+ + (Run1+2), with:– Lepton tag or Fully reconstructed hadronic tag– Sensitivity competitive with existing exptal limits (LEP: 5.7

10-4)


Some extrapolated yields (BaBar)• Extrapolated yields for B+ + and B+K+

Channel

sig tagTheor.pred.

Yield(0.1ab-1)

Yield(0.5ab-1)

Yield(2ab-1)

B+ + 0.20.2

1 10-3

5 10-3

5 10-5 16

636

24144

B+K+ 0.30.2

1 10-3

5 10-3

4 10-6 0.10.4

0.72

39Present analysis: backgrounds:

280 events in 80fb-1K 2 events in 56MBB pairs


Rare decays - SummaryProjections from Snowmass 2001: reconstructed events

Efficiencies from BaBar/Belle; some numbers should be updated(*) “B exclusive tag” (assuming 0.2%)

Decay mode

BF

Nrec 0.5 ab-1

Nrec 3.0 ab-1

Nrec 10 ab-1

B Xs (3.3 0.3) 10-4 1.7K (*) 10K (*) 34K (*)

B0 K*0 B0

(4.23 0.40 0.22) 10-5 10-6

6K 150

36K 900

120K 3K

B Xs

B Xse

e

B K*

B K*ee

6 10-6

2 10-6

300 (*) 350 (*) 120 150

1.8K (*) 2.1K (*) 720 900

6K (*) 7K (*) 2.4K 3K

B Xs

B K* 4 10-5 5 10-6

8 (*) 1.5 (*)

50 (*) 10 (*)

160 (*) 30 (*)

B

B

B B

10-7 10-9 5 10-5 1.6 10-7

17 (*) 8

100 (*) 50

350 (*) 150

B 10-8 0.4 2.4 8

Asymmetries!

Rates…


Conclusions & Outlook • B factories discovered CP violation in B decays and are

measuring sin2 with increasing accuracy

• Each of the two B factories integrated a luminosity of about 0.1ab-1 and should integrate 0.5ab-1 by 2006; depending on the machine upgrade options, about 2ab-1 per experiment could be within reach by the end of the decade

• Such an increase in integrated luminosity will significantly extend the physics reach of the B factories, both for the Unitarity Triangle, and for rare B decays

• Other topics, including charm and tau physics, are part of the physics program (see backup slides)

Backup slides


An example: D mixingVery small in the S.M. 2 additional suppression

A window for new physics

Sensitivity estimate (BaBar)1, including statistical and

systematic uncertainties

Charm

limit3

005.0 222

SUmmm Wds

c

c

u

ud,s d,s

W-

W+

Vcd,cs

V*cd,csV*

ud,us

Vud,us

D0 D0

“long distance” -iy

“short distance” x

D0 D0K-,

K+,+

0.5 ab-1 5.0 ab-1

y 0.003 0.001(x2+y2)/2 0.0002 0.0001


Another example: lepton number violation

S.M., extended to include mixing and mass:

BR( O(10 - 34)

BaBar sensitivity, projections:

tau

lepton number is violated inmany extensions of the S.M.(present limits, O(10-6) are closeto some model predictions)

Channel 4 sensitivity 0.1 ab-1

4 sensitivity 1.0 ab-1

4 sensitivity 5 ab-1

(e) 10-6 3 10-7 1.4 10-7


Expt. Collider Beams Sqrt(s) (GeV)

Year Online

Lumi(1033

cm-2 s-1) (b-bbar) (nb)

bb pairs (107/yr)

c (m)

(b-bbar)/ (q-qbar)

CLEOIII CESR CESR-IV

e+e- 10 10

1999 ?

1.2 30

1 1

1.2 30

30 30

310-1

310-1 BaBar Belle

PEP-II KEK-B

e+e-

asymm 10 10

1999 1999

3-10 3-10

1 1

3-10 3-10

270 200

310-1

310-1 HERA-B HERA pN 40 1999 - 6-12 50-100 9000 110-6 CDF-II D0 BTeV

Tevatron ppbar 1800 2000 2004

0.2-1.0 0.2

100000 20000 500 5000

110-3

LHC-B Atlas CMS

LHC pp 14000 2007 0.15 500000 75000 7000 500

510-3

B physics: acceleratorsHadron colliders:

Higher cross sctions, but: higher bkgd, lower efficiency B-factories:

Luminosity is the critical factor


DIRC PID)144 quartz bars

11000 PMs

1.5T solenoid

EMC6580 CsI(Tl) crystals

Drift Chamber40 stereo layers

Instrumented Flux Returniron / RPCs (muon / neutral hadrons)

Silicon Vertex Tracker5 layers, double sided strips

e+ (3.1GeV)

e- (9GeV)

BaBar Detector

SVT: B vertex z resolution ~70 micronsTracking: (pT)/pT = 0.13% pT 0.45%DIRC: K- separation > 3.4 for P <

3.5GeV/cEMC: E/E = 1.33%E-1/4 2.1%


• Error on the diluted CP asymmetries (Aobs = DACP)

– Number of events:

– Efficiencies:

– Dilutions:

• B factories– Small cross section:– higher efficiencies and better dilutions D2

CP asymmetries: sensitivity

02 fLdtN bbprod

tagCPdec

bkgdtagmix dddD

.).(501 collhadrbnbbb

prodobsCP NBRDND

A

11


BaBar, sin2: “golden” modes, now

on-peak: 81.9 fb-1

off-peak: 9.6 fb-1

89 M BB pairsJ/ Ks (Ks +-)

J/ Ks (Ks 00)

J/ K*0 (K*0 Ks0)

c1 Ks

(2s) Ks

J/ KL

Bflav Mixing sample

Flavor states: to measure mixing and D,

R

CP states with charmonium: to measure sin2

cp

2641 tagged events

25375 events


CP violation: sin2

cp

sin2 = 0.741 0.067 (stat) 0.034 (syst)

cp

sin2 = 0.755 0.074 sin2 = 0.723 0.158

PRL 89 (2002) 201802


sin2 - K0S hep-ex/0207070

..%901056.0

109.05.17.1

7.8

108.00.12.9

pairs B1060

6

600

6*

6

LCBBF

KBBF

KBBF

S

Pure QCD Penguin, sensitive to New Physics contributions

In the SM, time-dependent asymmetry in K0

S measures sin2B K0

S

51 events

0.520.50sin 2 0.19 ( ) 0.09( )

stat systFrom 87 M B pairs:


sin2 - J/0 hep-ex/0207058

events

0 5( / ) (2.0 0.6 0.2) 10BR B J

0

0

/

/

0.05 0.49( ) 0.16( )

0.38 0.41( ) 0.09( )J

J

S stat syst

C stat syst

++ If no penguins: we measure -sin2

3cdcbVV 3


sin2 - ’K0S

Large Penguin contribution expected !

B ’K0S

203 events

03.022.010.003.034.002.0

011.0045.0037.0100.42.54.55'

104.45.39.76'600

6

CSA

KBBF

KBBF

CH

preliminary


sin2 - D*D* (b ccd) B0D*+ D*

•D*+D*-, is not a CP eigenstate (L=0,2 and L=1)

•CP odd fraction R R

•..Transversity analysis

2

2 2 20 ||

| || | | | | |

ARA A A

2 21 d 3 3(1 )sin cosd cos 4 2tr tr

tr

R R

CPCP-odd fraction-odd fractionRR = 0.07 = 0.07 0.06 0.06

0.030.03 mostly CP-even !

hep-ex/0207072


sin2 - D*D*

-sin-sin22 Small ( < 0.1 T) penguin contribution expected

++We measure :

•Im() •||

From 126 12 signal events

Im(+) = 0.31 0.43 (stat) 0.13 (syst)

-sin2 = -0.741 0.067

|| = 0.98 0.25 (stat) 0.09 (syst)

preliminary


BaBar, sin2: modes with Penguins, now

K0S

51 events

J/0 events

’K0S

203 events

D*D*++

126 12 events


BaBar, present sin2eff : S and C

0.02 0.34( ) 0.05( )

0.30 0.25( ) 0.04( )

S stat syst

C stat syst

B→

2 1 /

1 /

2effsin(

sin(

)1 2

)

i i

i iP T e e

P T e eie

C

C

S

PRL sub., hep-ex/0207055


Isospin analysis: projections - 2• Sensitivity to : toy MC with BaBar detector• Assumptions (example):

L = 0.5 ab-1 L = 2.0 ab-1

<BR(B)> = 1.0x10-6

BR(B) = 4.1x10-6

BR(B0) = BR(B0) = 4.7x10-6

4-fold ambiguity !


The theoretical errorof 10% should be further

reduced at the 5%level using all information

P*l, Q2 and Mx


Exclusive b d, from 78fb-1:(interesting for |Vtd/Vts|2)

Rare decays: EM Penguins

40.430.23

S

10(theory))0.37(sys)

0.36(stat)(3.88)XBF(

B

047.0*BFBF

102.1BF

103.2BF

..%90104.1BF

60

6

600

KBBB

B

LCB

SM expectation: 60 101BF B

Present analysis limited byphotons from Continuum bkgd:without improvements:3 sensitivity at 0.8 (0.25) ab-1

if bkgd x 0.5, then: 3 sensitivity at 0.4 (0.1) ab-1

for individual (combined) modes

BF(B )/BF(B K*)

|Vtd/Vts|2

Fully inclusive b s, lepton tag

B-Factories: Physics Reach

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Transcript of B-Factories: Physics Reach