Sin2 f 1 sin2 b via penguin processes
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sin2 f 1 /sin2 b via penguin processes. Beauty 2006 Sep.25-29, Univ. of Oxford Yutaka Ushiroda (KEK). _. _. b. b. c. J/ Y. c. B 0. w. d. d. _. s. _. w. K 0. d. s. f , h ’. t. g. B 0. s. _. s. K 0. d. Introduction. Time-Dependent CP asymmetry in B 0 decays. _.

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sin2 f 1 /sin2 b via penguin processes

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Sin2 f 1 sin2 b via penguin processes

sin2f1/sin2b via penguin processes

Beauty 2006

Sep.25-29, Univ. of Oxford

Yutaka Ushiroda (KEK)


Introduction

_

_

b

b

c

J/Y

c

B0

w

d

d

_

s

_

w

K0

d

s

f, h’...

t

g

B0

s

_

s

K0

d

Introduction

Time-Dependent CP asymmetry in B0 decays

_

Extra CPV phase from New Physics


Sm contamination

Long distance effect

2

Tree (Vub) contamination

2

P

P’

T

T’

mode

CP

P

P’

T

T’

Ks

1

4

KsKsKs

+1

K+KKs

~+1

Ks



f0Ks



Ks



4

Ks



SM Contamination

Need to know the size to claim NP

a Positive Dsin2f1

u-quark penguin

~Vub*Vus


Theoretical estimates of d sin2 f 1 b

QCDF

-0.1

0.1

0.2

0

Dsin2f1/b

Theoretical estimates of Dsin2f1/b

Short distance effect

QCDF:

Beneke, PLB 620, 143 (2005)

Cheng, Chua, Yang, PRD 73, 014017 (2006)

pQCD:

Mishima, Sanda, PRD 72, 114005 (2005)

SCET:

Williamson, Zupan, PRD 74, 014003 (2006)

Long distance effect (is small)

Cheng, Chua, Soni, PRD 72, 014006 (2005)

Lazzaro’s talk

at ICHEP06

Three theoretically-clean modes

Reviewed in hep-ph/0605301 (talk by Chua in FPCP06)


Status before summer

Status before summer


Reconstruction modes

KS+- : KSgp+p-

KS00 : KSgp0p0

Reconstruction modes


Reconstruction modes1

KS+- : KSgp+p-

KS00 : KSgp0p0

Reconstruction modes


B g k k k 0 time dependent dalitz

Obtain CP parameters for 2-body and 3-body modes simultaneously

hep-ex/0607112

BgK+K-K0 Time-dependent Dalitz

Intermediate resonances ( f(1020)K0, f0(980)K0, X0(1550)K0, cc0K0, D+K-, Ds+K-) and NR

K+K-KS+-

K+K-KS00

K+K-KL

151665

K+K-K0signal


Sin2 f 1 sin2 b via penguin processes

hep-ex/0607112

b measurement (not sin2b)

exclude

at 4.6s

Fit to low K+K- mass region (<1.1GeV)

First in f0gK+K-

Preliminary

fK0: sin2beff = +0.12  0.31(stat)  0.10 (syst)

Cf. BaBar 2005


B 0 g f k 0

hep-ex/0608039

B0gfK0

fgK+K-, KSgp+p-

fgK+K-, KSgp0p0

fgKSKL, KSgp+p-

24618

409

227

30721 fKS signal

fgK+K-

11417

fKLsignal

B0 momentum

New mode

B0 mass

(bkg subtracted)


T cp v in b 0 g f k 0

hep-ex/0608039

TCPV in B0gfK0

Preliminary

“sin2f1” = +0.50  0.21(stat)  0.06(syst)

A = +0.07  0.15(stat)  0.05(syst)

Dt distribution and asymmetry

  • Consistent with the SM (~1s lower)

  • Consistent with Belle 2005 (Belle2005: “sin2f1” = +0.440.270.05)

  • fKS and fKL combined

  • background subtracted

  • good tags

  • Dt g –Dt for fKL

unbinned fit

SM


T cp v in b 0 g f 0 k s

hep-ex/0609006

TCPV in B0gf0KS

Preliminary

f0gp+p-

Raw Asymmetry

B0 mass

377  25f0KSsignal

p+p- mass

good tags

“sin2f1” = +0.18 0.23(stat)  0.11(syst)

A = -0.15  0.15(stat)  0.07(syst)


T cp v in b 0 g k k k s

hep-ex/0609006

“sin2f1” = +0.68 0.15(stat)  0.03(syst) (CP-even)

A = -0.09  0.10(stat)  0.05(syst)

+0.21

-0.13

TCPV in B0gK+K-KS

Preliminary

Raw Asymmetry

B0 mass

840  34

K+K-KSsignal

good tags

mixture of CP even and odd states

(2005)


Reconstruction modes2

KS+- : KSgp+p-

KS00 : KSgp0p0

Reconstruction modes


B 0 g h k 0

hep-ex/0608039

B0gh'K0

B0 mass

B0 momentum

(bkg subtracted)

h’ rg Ks(p+p-)794  36

 h(2g)pp Ks(p+p-)363  21

 h(3p)pp Ks(p+p-)100  11

rg Ks(p0p0)103  15

h(2g)pp Ks(p0p0) 62  9

Total1421 46

h’h(2g)pp KL 392  37

h(3p)pp KL 62  13

Total 454  39


T cp v in b 0 g h k 0

hep-ex/0608039

TCPV in B0gh'K0

Preliminary

“sin2f1” = +0.64  0.10(stat)  0.04(syst)

A = -0.01  0.07(stat)  0.05(syst)

Dt distribution and asymmetry

  • Consistent with the SM

  • Consistent with Belle 2005 (Belle 2005: “sin2f1” = +0.620.120.04)

  • First observation of TCPV

  • (5.6s) in a single bgs mode

  • h'KS and h'KL combined

  • background subtracted

  • good tags

  • Dt g –Dt for h'KL


Sin2 f 1 sin2 b via penguin processes

hep-ex/0607100

B0gh'K0

93641

h'KS signal

16821

h'KL signal


T cp v in b 0 g h k 01

hep-ex/0607100

TCPV in B0gh'K0

Preliminary

“sin2b” = +0.55  0.11(stat)  0.02(syst)

A = +0.15  0.07(stat)  0.03(syst)

“sin2b” 4.9s from zero.

Cf. BaBar 2005: “sin2b” = +0.36  0.13  0.03


Reconstruction modes3

KS+- : KSgp+p-

KS00 : KSgp0p0

Reconstruction modes


Vertex reconstruction with k s

Vertex Reconstruction with KS

Extrapolate KS track to the Interaction Point

Vertex reconstruction efficiency with a single KS :

30 to 45% (Belle), 60% (BaBar KSp0)

Events without the vertex can still be used for A-term measurement.

Ks track

p+ p-

IP profile

BCP vertex

J/yKS with the KS Vertexing

Validity confirmed with J/yKS as a control sample.

Raw asymmetry

good tag


T cp v in b 0 g k s k s k s

hep-ex/0608039

TCPV in B0gKSKSKS

Preliminary

“sin2f1” = +0.30  0.32(stat)  0.08(syst)

A = +0.31  0.20(stat)  0.07(syst)

Dt distribution and asymmetry

B0 mass

  • background

    subtracted

  • good tags

15714KS +-KS +-KS+-

289KS +-KS +-KS00

18517 total


T cp v in b 0 g k s k s k s1

hep-ex/0607108

TCPV in B0gKSKSKS

Preliminary

“sin2b” = +0.66  0.26(stat)  0.08(syst)

A = +0.14  0.22(stat)  0.05(syst)

Dt distribution and asymmetry

11612KS +-KS +-KS+-

6012KS +-KS +-KS00

17617 total

mB & mmiss

instead of

mES & DE


T cp v in b 0 g p 0 k s

hep-ex/0607096

TCPV in B0gp0KS

425  28

p0KSsignal

Preliminary

missing mass & mB

“sin2b” = +0.33  0.26(stat)  0.04(syst)

A = -0.20  0.16(stat)  0.03(syst)


T cp v in b 0 g p 0 k s1

hep-ex/0609006

TCPV in B0gp0KS

Raw Asymmetry

B0 mass

515  32

p0KSsignal

good tags

Preliminary

“sin2f1” = +0.33 0.35(stat)  0.08(syst)

A = -0.05  0.14(stat)  0.05(syst)


T cp v in b 0 g k s

hep-ex/0609006

TCPV in B0gKS

Raw Asymmetry

118  18

KSsignal

good tags

B0 mass

Preliminary

“sin2f1” = +0.11 0.46(stat)  0.07(syst)

A = -0.09  0.29(stat)  0.06(syst)


T cp v in b 0 g w k s

hep-ex/0607101

“sin2b” = +0.62 (stat)  0.02(syst)

A = +0.43 (stat)  0.03(syst)

+0.25

-0.30

+0.23

-0.25

TCPV in B0gwKS

142  17wKSsignal

Preliminary


Summary

Smaller than bgccs

in all of 9 modes

Summary

Theory tends to predict SM contamination in positive side

Naïve average of all b g s modes

sin2beff = 0.52 ± 0.05

2.6 s deviation

More statistics crucial for mode-by-mode studies


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