Time-Dependent CP violation in bsqq and bs decays

Lake Louise Winter Institute

Feb.21, 2005

Yutaka Ushiroda (KEK)

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• Introduction– Time-Dependent CP asymmetry (TCPV)– Belle & KEKB

• Results– TCPV in charmonium modes– TCPV in hadronic bs penguins– TCPV in radiative bs penguin

• Summary

OutlineOutline

b sqqb ccs

b s

0 0

0 0

sin cos

d CP d CP

CP

d CP d CP

B t f B t fA t

B t f B t f

S m t A m t

Time dependent amplitudes are different because of the KM phase

=ｆｃｐ

B0

B0mixing B0

B0 ｆｃｐ

Mixing-induced time-dependent CPV

Direct CPV

Time-Dependent CP violation (TCPV)

mixing

V*td

Vtd_ _

t

dt

b

b

d _ww B0B0

__

d

b_ c

c

sd

_wB0J/

K0

b ccs

Mixing (1) + Decay w/o KM phase

In tree, no room that a NP steps in SM anchor point

1sin 2 , 0fS A 1

:f CP eigenvalue

d

b_ _

sssd

_gtB0

K0

, ’...w

V*td

Vtd_ _

t

dt

b

b

d _ww B0B0

_

b sqq

Extra CPV phase (NP)1 1"sin 2 " sin 2 0.73

0b sqq b ccs

A A

_ _

d

b s

ssd

_gbR~_

sR~_

g~

Experimental technique

electron(8GeV)

positron(3.5GeV)

(4S)

+

-

KS

J/B1

B2

+-

K+

-0

D

B0_

B0

t z c

z ~ 200m

fCP

Flavor tag

~1 km in diameter

Mt. Tsukuba

KEKBBelle

KEKB accelerator

3.5 GeV e X 8.0 GeV e

crossing angle = 11 mrad.

34 2 1

1

6

1.5 10

360

# 1 10

peakL cm s

Ldt fb

BB day

Belle

World Records

World Records

Results based on 140fb-1 or 253fb-1

KL detector14/15 layer RPC+Fe

Electromagnetic Calorimeter

CsI(Tl) 16X0

Aerogel Cherenkov Counter n = 1.015~1.030

Si Vertex Detector4-layer DSSD

TOF counter

3.5 GeV e+

Central Drift Chamber momentum, dE/dx 50-layers + He/C2H6

charged particle tracking

K/ separation

K/ separation

B vertexMuon / KL identification

, 0 reconstructione+-, KL identification

8.0 GeV e-

Belle Detector

hep-ex/0408111

4347 signal events

sin21 result

6152 10 BB

poor flavor tag

good flavor tag

qCP=+1qCP=-1

1sin 2 0.728 0.056 0.023

b ccs

Good tag

Poor tag

S = 0.73fit

0

Eve

nts

/(50

MeV

/c) Nsig=3615

purity = 0.17

sig + bkg_sumbkg_sumsig + B-bkgB-bkg

Nsig = 13914purity = 0.63

[hep-ex/0409049]

B0K0

preliminary

~1.9 away

_275M BB

1"sin 2 " 0.06 0.33 0.09

0.08 0.22 0.09A

b sqq

[hep-ex/0409049]

B0KS

~0.0 away

_275M BB

Nsig = 31 7purity = 0.56

Good tagRaw

Asy

mm

etry

10.13"sin 2 " 0.75 0.640.16

0.26 0.48 0.15A

S = 0.73fit

preliminary

b sqq

[hep-ex/0409049]

B0KSKSKS

~2.8 away

_275M BB

Good tagRaw

Asy

mm

etry

1"sin 2 " 1.26 0.68 0.18

0.54 0.34 0.08A

S = 0.73fit

Nsig = Purity =

preliminary

b sqq

[hep-ex/0409049]

B0’KS

~0.4 away

_275M BB

Good tag

Raw

Asy

mm

etry

1"sin 2 " 0.65 0.18 0.04

0.19 0.11 0.05A

S = 0.73fit

Nsig = 512 27purity = 0.61

preliminary

b sqq

[hep-ex/0409049]

B0KKKS

~0.9

_275M BB

Good tagR

aw A

sym

met

ry

1"sin 2 " 0.49 0.18 0.04

0.08 0.12 0.07A

S = 0.73fit

preliminary

Nsig = 399 28purity = 0.56

1 1.03 0.15 0.05f Mixture of CP even/odd

[PRL 91, 261602 (2003)]

b sqq

[hep-ex/0409049]

B0KS0

~0.7

_275M BB

Good tagRaw

Asy

mm

etry

1"sin 2 " 0.30 0.59 0.11

0.12 0.20 0.07A

S = 0.73fit

preliminary

Nsig = (high LHR) (low LHR)purity = 0.55 (high LHR), 0.17 (low LHR)

high LHR only

b sqq

[hep-ex/0409049]

B0f0(980)KS

~2.9

_275M BB

Good tagRaw

Asy

mm

etry

1"sin 2 " 0.47 0.41 0.08

0.39 0.27 0.08A

S = 0.73fit

preliminary

Nsig = 94 14purity = 0.53

b sqq

Deviation from SM expectation !?

w/o theory error

“sin21” from hadronic bs penguins

1"sin 2 ( )" 0.39 0.11b sqq Belle

1sin 2 ( ) 0.726 0.037 . .b ccs W A

~2.7

V*td

Vtd_ _

t

dt

b

b

d _ww B0B0

_

d

b_ _

s

d

tB0 K0

w

b s

Introduction

1

2sin 2 4%s

CPb

mS

m

AGS [Phys.Rev.Lett. 79, 185 (1997)]TCPV in B0M0 decayM0 : self-conjugate state (K*0(KS0), K1(KS0)) : polarized in the SM. Carries the flavor information.

b

b

Ls

Rs

s

b

m

m (Helicity flip)

Due to , the final state is (almost) flavor specific

A large CPV New Physics

An effect that unpolarizes the

~10% according to B.Grinstein, Y.Grossman, Z.Ligeti, D.Pirjol [PRD 71, 011504 (2005)]

Nsig=57 9purity 0.65

S = 0fit

Poor tag

Good tag

0.630.79 0.090.50

0 ( )

S

A fixed

B0K*0(KS0)

[hep-ex/0409049]

preliminary

_275M BB

K2*(1430)

K*(892)

Extended AGS (AGHS)

57 9 105 14

AGHS [hep-ph/0410036]TCPV in B0P0Q0 decayP0,Q0: self-conjugate spin-0 neutral particle (KS0,KS))

Nsig=105 14purity 0.50

S = 0fit

Poor tag

Good tag

0.460.58 0.110.38

0.03 0.34 0.11

S

A

[hep-ex/0410036]prelim

inary

_275M BB

B0KS0

0 1.8SK

M GeV

TCPV in b ccs We know well about SM

TCPV in hadronic b s penguins 2.7 away from SM expectations with all the

Belle results combined

TCPV in radiative b s penguins SM prediction is S~A~0

measured with B0 Ks0 (M(KS0)<1.8GeV) consistent with 0

Summary

0.460.58 0.110.38

0.03 0.34 0.11

S

A

1sin 2 0.728 0.056 0.023

1"sin 2 " 0.39 0.11

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