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Direct CP and Rare Decays. June 21, 2005 B Physics at Hadronic Machines, Assisi. Outline. Machine, Detector, Basic Method Direct CPV in K p Observation of p 0 p 0 Polarization in f K *, r + K * 0 Khh Dalitz Analysis Baryonic Modes. New Results only at LP05 and EPS.

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slide1

Direct CP and Rare Decays

June 21, 2005B Physics at Hadronic Machines, Assisi

outline

Outline

  • Machine, Detector, Basic Method
  • Direct CPV in Kp
  • Observation of p0p0
  • Polarization in fK*, r+K*0
  • Khh Dalitz Analysis
  • Baryonic Modes

New Results only at LP05 and EPS

kekb b factory

Electron 8 GeV

Positron3.5 GeV

KEKB B-Factory

Tsukuba Mt.

3Km

Υ(4S) (10.58GeV/c2)

 = 0.425

luminosity
Luminosity

1 fb–1

per day

peak luminosity = 15.81 /nb/sec (May 18, 2005)

slide6

e-

e-

e+

e+

B

B

B Signal Reconstruction

In Υ(4S) rest frame:

∆E

Mbc

1D-binned fit

2D-unbinned fit

background suppression
Main background for hadronic rare B is continuum qq events.

(q=u,d,s,c).

Topology of continuum events and B decays are different.

Choose |cosθThrust| S⊥ R2so R4so R2oo R3oo R4ooas input to Fisher,

and combine it with cosθBto calculate the Likelihood Ratio.

Define modified Fox-Wolfram moment:

Use Fisher discriminant to optimize the coefficients.

Υ(4S)

B decay

continuum events

Background Suppression
slide8

Likelihood Ratio (LR)

Optimize

uds

charm

off reson.

sideband

slide9

Evidence for DCPV in B Kp

Y. Chao, P. Chang et al. PRL 2004

CLEO 1999 (PRL 2000)

253 fb–1

214053 evts

ACP(K+p–) =

–10. 1 ± 2.5 (stat) ± 0.5 (syst) %

w/ BaBar > 5s

3.9s

slide10

AKp, AppSizable

Ali @ ICHEP2004

Belle

SU(3) relatesApp= -3AKp

(Gronau & Rosner)

BaBar

Sizable T-P Strong Phase

slide11

AKp0≠AKp?

Y. Chao, P. Chang et al. PRL 2004

253 fb–1

72834 evts

ACP(K+p0) = 4 5  2%

2.4s from K+p-

(3.6sw/ BaBar)

Large EWPenguin?

Large C ?

d

p0

_

d

b

s

B-

K-

u

u

slide12

Observation of B0p0p0

Y. Chao, P. Chang et al. PRL 2005

253 fb–1

8216 evts

B = (2.32 ) x 10-6

0.44

0.48

0.22

0.18

5.8 s

Use same flavor-tagging

as TCPV analysis

ACP = 4417%

53

52

Main limiting factor for

f2 program from pp

slide13

Polarization in B  fK*

fK* polarization anomaly?

But

…?

slide14

Polarization in B  fK*

K.F. Chen et al., hep-ex/0503013, to appear PRL

253 fb–1

slide15

fK* Polarization

transversity basis

Naively

slide16

Angular Analysis for fK* Polarization

Confirm fL ~ 0.5

4.3sevidence for FSI (strong phase)

slide17

New Physics Test with fK* Polarization

T-odd CPV

Datta & London 2004

slide19

Polarization in B  r+K*0

J. Zhang et al., hep-ex/0503013, submitted PRL

253 fb–1

(2-d unbinned fit projections)

Non-resonant r+K+p– Significant

Take into account in Angular Analysis

slide20

Angular (fL) Analysis for r+K*0

helicity basis

A0

NR-rKp

Another pure-PfL ~ 0.5

khh dalitz analysis summary

KhhDalitz Analysis Summary

A. Garmash et al., hep-ex/0412066, submitted PRD

140 fb–1

b k model fitting to signal

Model Kππ-AJ:

SAJ(Kππ) = A1(K*(892)) + A0(K*0(1430))

+ AJ(fX(1300)) + A0(cC0)

+ A1(ρ(770)) + A0(f0(980))

B+ K+π+π-: Model Fitting to Signal

L=140 fb-1

Model Kππ-A0

Model Kππ-A0

fit the data with different spin assumptions

b k k k model fitting to signal

Model KKK-BJ:

Helicity angle distributions:

SBJ(KKK) = A1(φ(1020)) + AJ(fX(1500))

+ A0(cC0) + ANR

ANR Parameterizations used:

ANR(s13,s23) = a1(e-βs13 + e–βs23)eiδ

fX(1500) is best fit with the scalar hypothesis

B+ K+K+K-: Model Fitting to Signal

L=140 fb-1

Model KKK-B0

ANR(s13,s23) = a1eiδ

ANR(s13,s23) = a1[(1/s13)b+ (1/s23)β]eiδ

Model KKK-B0

fX(1500)

φ(1020)

search for dcpv in b k

Null asymmetry tests:

  • qq related background: ACP(qq)=(-0.83±1.30)%
  • BB related background: ACP(BB)=(-1.15±2.18)%
  • B->Dπ->Kππ signal: ACP(Dπ)=(-1.16±0.86)%

Search for DCPV in B± K±π+π-

253 fb–1

3115±92 evts

N(B-) = 1637±68

N(B+) = 1492±65

preliminary

N(K-π-π+) – N(K+π+π-)

ACP(K±π+π-) = = (+4.6±3.0 ) %

+1.7

-1.2

N(K-π-π+) + N(K+π+π-)

Considered as a

systematic error

due to detector

asymmetry

dcpv hint in b 0 k

DCPV Hint in B+ ρ0K+

253 fb–1

A 2.4σ hint for Direct CP violation in B±->ρ(770)0K±

preliminary

ACP(ρ0K±) = 27 ± 12 ± 2 %

+59

- 3

slide26

Improved B+  ppK+ Measurement

M.Z. Wang et al., PLB 2005

140 fb–1

21717 evts

Threshold Peaking

BF: 4.59 ± 0.50 x 10-6

(4.89 x 10-6, PRL92, 131801, 2004)

Two-body not yet seen.

+0.38- 0.34

b 0 ll l p pp and other
B0 LL, Lp, pp and other

140 fb–1

M.C. Chang et al. PRD 2005

90% confidence level UL:

B0pp< 4.1 x 10-7

B0Lp< 4.9 x 10-7

B0LL< 6.9 x 10-7

Belle:B+ J/pL < 4.1 x 10-5

BABAR:B+ J/pL< 2.6 x 10-5

B+ J/pp<1.9 x 10-5

BABAR, 81fb-1

Belle, 78fb-1

slide28

threshold peaking

threshold peaking

Threshold Peaking: ppKs &pLp

slide29

Angular Distribution: ppK+

p

Өp

X

K+

bs dominant process

Fragmentation picture

p

at pp rest frame

s

u

K+

p

u

d

u

u

s

u

u

d

p

ppK signal

Proton against K- (p against K+) : flavor dependence!

(Expect symmetric distribution if effective 2-body)

outline1

Outline

  • Machine, Detector, Basic Method
  • Direct CPV in Kp
  • Observation of p0p0
  • Polarization in fK*, r+K*0
  • Khh Dalitz Analysis
  • Baryonic Modes

New Results only at LP05 and EPS

previous b ppk pp p measurement

Previous B+ ppK+,ppp+Measurement

M.Z. Wang et al., PRL 2004

78 fb–1

Threshold Peaking

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