Tim Gershon - Welcome to the University of Warwick · 2006-02-20 · Mbc (GeV/c 2) Entries/2MeV/c 2...

BELLE

LATEST RESULTS FROM BELLE

AND PLANS FOR A SUPER B FACTORY

Tim GershonUniversity of Warwick

January 24, 2006

Tim Gershon University of Oxford Seminar January 24, 2006

BELLE Contents

• KEK-B and Belle

• Summer 2005 highlights(http://belle.kek.jp/conferences/CONF2005/)

– direct CP violation

– measurements of UT angles

– penguin dominated processes

• Super B Factory


BELLE Belle Collaboration


BELLE KEK


BELLE Integrated Luminosity


BELLE Luminosity Trends

0

2

4

6

8

10

12

14

16

2000 2002 2004 2006Year

Pea

k lu

min

osit

y (1

033 c

m-2

s-1 )

Increase of Peak Luminosity

1.0025 1034/cm2/s on 2005/10/9 (PEP-II)

1.627 1034/cm2/s on 2005/12/19 (KEKB)

10 29

10 30

10 31

10 32

10 33

10 34

1970 1975 1980 1985 1990 1995 2000 2005

Peak Luminosity trends in last 30 years

YearP

eak

lum

inos

ity

(cm

-2s-1

)

DORISHERA

PETRA

ISR

LEP1

LEP2

SppS

CESR

TEVATRON

SPEAR

PEP

PEP II

TRISTAN

KEKB


BELLE Belle Detector


BELLE Inner Detector Upgrade - Summer 2003

Number of silicon DSSDs3 layers → 4 layers

Radius of beam piper = 2.0 cm → r = 1.5 cm

Radiation hardness1 MRad → > 20 MRad

Laboratory polar angle coverage23◦ < θ < 139◦ → 17◦ < θ < 150◦

IMPROVED RESOLUTION!


BELLE Search for Θ(1540)+ Using Kaon Interactions397

fb−1

PLB

632,173

(2006)

. . . no pentaquarks found


BELLE CKM Phenomenology

VCKM =

Vud Vus VubVcd Vcs VcbVtd Vts Vtb

∼

1 − λ2/2 λ Aλ3(ρ− iη)

−λ 1 − λ2/2 Aλ2

Aλ3(1 − ρ− iη) −Aλ2 1

where A, λ, ρ, η are Wolfenstein parameters

From unitarity (V ∗CKMVCKM = 1):

VudV∗ub + VcdV

∗cb + VtdV

∗tb = 0

The Unitarity Triangle

φ1 ↔ β

φ2 ↔ α

φ3 ↔ γ

(0,0) (1,0)

(ρ,η)

φ1

φ2φ3

VudVub*

VcdVcb*

VtdVtb*

VcdVcb*


BELLE The Purpose of the B Factory

• Within the Standard Model, only B system has large CP violation

• Hadronic parameters (τB, ∆md) ⇒ CP effects accessible

• e+e− collisions at high luminosity– large data sample– clean environment

reconstruct almost any decay mode (even with neutrinos)

• Precise test of quark mixing & CP violation within SM

• Search for new physics

• Copious samples of τ pairs, D mesons and other particles also produced⇒ broad physics program


BELLE Categories of CP Violation

• Usually discussed in the context of neutral B decays

• Consider B0/B0 decaying to a CP eigenstate

• Define λCP = qpAA

– p, q from B0 − B0 mixing– Standard Model : qp ∼ e−2φ1

(usual phase convention)

• Three categories of CP violation

1 |q/p| 6= 1 CPV in mixing2

∣

∣A/A∣

∣ 6= 1 CPV in decay (direct CPV )3 Im(λCP ) 6= 0 CPV in mixing—decay interference

• With amplitude analysis can also consider

2′ Im(A/A) 6= 0 CPV in decay amplitude to Q2B state

B0

B– 0

fCP∆m

A

A–


BELLE Experimental Technique

• For most modes, use two kinematic variables to identify signal∆E = EB −Ebeam Mbc =

√

E2beam − p2B

• Put event-shape variables into likelihood ratio to reject background

• Particle ID from ACC, TOF & CDC used to separate K/π


BELLE

Direct CP Violation


BELLE Direct CPV in B0 → K+π−357

fb−1

BELLE-CONF-0523

0

100

200

300

400

500

600

700

5.2 5.25 5.3Mbc (GeV/c2)

Ent

ries/

2MeV

/c2

K−π+

0

100

200

300

400

500

600

700

5.2 5.25 5.3Mbc (GeV/c2)

Ent

ries/

2MeV

/c2

K+π−

0

100

200

300

400

500

600

700

0 0.5∆E (GeV)

Ent

ries/

20M

eV

K−π+

0

100

200

300

400

500

600

700

0 0.5∆E (GeV)

Ent

ries/

20M

eV

K+π−

ACP(

K+π−)

= −0.113 ± 0.022(stat) ± 0.008(syst)

Significance: 4.97σ


BELLE Direct CPV in B+ → K+π0357

fb−1

BELLE-CONF-0523

0

25

50

75

100

125

150

175

200

5.2 5.25 5.3

Mbc (GeV/c2)

Ent

ries/

2MeV

/c2

K-π0

0

25

50

75

100

125

150

175

200

5.2 5.25 5.3

Mbc (GeV/c2)

Ent

ries/

2MeV

/c2

K+π0

0

20

40

60

80

100

-0.25 0 0.25

∆E (GeV)

Ent

ries/

15M

eV K-π0

0

20

40

60

80

100

-0.25 0 0.25

∆E (GeV)

Ent

ries/

15M

eV K+π0

ACP(

K+π0)

= 0.04 ± 0.04(stat) ± 0.02(syst)

ACP

(

K+π0)

−ACP

(

K+π−)

3.1σ from zero


BELLE Direct CPV in B+ → K+π+π−357

fb−1

Belle-Preprint-2005-36

• Veto major charm(onium) contributionsto K+π+π− final state

• 4286 ± 99 signal events

• Parametrize each contributing resonant term asaje

iδj(

1 + ηbjeiφj

)

Aj

– ajeiδj = CP conservating complex amplitude

– bjeiφj = CP violating part

– η = +1(−1) for B+ (B−)– Aj = Breit-Wigner (etc.) dependence

• Can translate to usual CP asymmetry

ACPj = −2bj cosφj

1+b2j

(δ=0) φA+

A−

a

ab

0

400

800

1200

1600

2000

-0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5∆E (GeV)

Eve

nts

/(1

0 M

eV

)

- data

- total background

- continuum

- BB total

- BB charmless

B±→K±π+π-

0

5

10

15

20

25

0 5 10 15 20 25 30

M2(K+π-) (GeV2/c4)M2(

π+π-) (GeV2/c4)

(b)



fb−1


Fit first without CP terms to establish model (bj = 0)

0

100

200

300

400

1 2 3 4 5

M(K+π-) (GeV/c2)

Events/(50 MeV/c2)

(a)

0

50

100

150

200

0.6 0.8 1.0 1.2 1.4 1.6

0

100

200

300

400

0 1 2 3 4 5

M(π+π-) (GeV/c2)

Events/(50 MeV/c2)

(b)

0

10

20

30

40

3.2 3.3 3.4 3.5

Contributions from K∗(892)0π+, K∗0(1430)

0π+, ρ0K+, ωK+, f0K+,f2(1275)K

+, fX(1300)K+, χc0K+ & non-resonant terms

f0(980) parametrized by Flatte lineshape, fX(1300) assumed scalar (f0(1370)?)



fb−1


First evidence for direct CPV in charged B decays

• Statistical significance calculated as√

−2 ln(L0/Lmax)

• Largest systematics from model uncertainty



fb−1


Asymmetry in the ρ region clearly visible in the data

0

20

40

60

80

100

120

0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2M(π+π-) (GeV/c2)

Events/(0.02 GeV/c2) B-→ K-π-π+ (a)

0

20

40

60

80

100

0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2M(π+π-) (GeV/c2)

Events/(0.05 GeV/c2) B-→ K-π-π+ (c)

cos(θππhel )<0

0

20

40

60

80

100

120

140

160

0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2M(π+π-) (GeV/c2)

Events/(0.05 GeV/c2) B-→ K-π-π+ (e)

cos(θππhel )>0

0

20

40

60

80

100

120

0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2M(π+π-) (GeV/c2)

Events/(0.02 GeV/c2) B+→K+π+π- (b)

0

20

40

60

80

100

0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2M(π+π-) (GeV/c2)

Events/(0.05 GeV/c2) B+→K+π+π- (d)

cos(θππhel )<0

0

20

40

60

80

100

120

140

160

0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2M(π+π-) (GeV/c2)

Events/(0.05 GeV/c2) B+→K+π+π- (f)

cos(θππhel )>0


BELLE Direct CP Violation — Summary

Direct CP violation seen by Belle:

• B0 → K+π− (∼ 10% ∼ 5σ)

• B0 → π+π− (∼ 50% ∼ 4σ)

• B+ → ρ0K+ (∼ 30% ∼ 4σ)


BELLE

Measurements of UT Angles


BELLE Key: Redundancy

(0,0) (1,0)

(ρ,η)

φ1

φ2φ3

VudVub*

VcdVcb*

VtdVtb*

VcdVcb*

φ1 φ2 φ3

b→ ccs (J/ψKS) b→ uud (π+π−, ρ+ρ−) b→ cus/ucs (DK−)b→ cud (Dπ0) b→ uus vs. b→ uud (Kπ vs. ππ)

b→ ccd (J/ψπ0, D+D−) 2φ1 + φ3

b→ sqq (φKS) b→ cud/ucd (D+π−)

. . . and many others!Tim Gershon University of Oxford Seminar January 24, 2006

BELLE φ3 from B → DK

• Can access φ3 via interference between B− → D0K− & B− → D0K−

Bigi & Sanda; Gronau, London & Wyler

• Reconstruct D in final states accessible to both D0 and D0

B− → D0K− ∼ VusV ∗cb B− → D0K− ∼ VcsV ∗

ubs

b

u

c

uW

u u

u

c

s

b

u

W

COLOUR ALLOWED COLOUR SUPPRESSED

K−)

D0K−)

0

φφ

δ

δ3

3

(B− DCP2A

(B−

(B− D K−)

A

AA — amplituderB = ASUPPRESSED/AFAVOURED

∼ 0.1 − 0.2

δB — strong phase difference


BELLE φ3 from B → DK: Final States

• Ultimately aim to use many states and combine results

• Inclusive analyses can be performed but sensitivity is diluted Reconstruct modes exclusively, where possible Use amplitude analysis (not, eg., Q2B analysis) where possible

• To extract φ3, need D decay “model” crucial role of charm factory

• Modes used so far1. CP even (mainly K+K−)

2. CP odd (mainly KSπ0)

3. Doubly Cabibbo suppressed states (Kπ)

4. Multibody final states (KSππ)

• Modes that may be used in future∗ KSK

+K−, π+π−π0, KSπ±K∓, K±π∓π0, KSπ

+π−π0, . . .


BELLE Parameters

• CP violation effects depend onφ3 : weak phase difference between B decay amplitudesδB : strong phase difference between B decay amplitudesrB : relative magnitude of B decay amplitudesδD : (strong phase difference of D decay amplitudes)rD : (relative magnitude of D decay amplitudes)

• For multibody D decays, last two described by decay model

• D decay model also includes assumptions of– no mixing– no CP violation

. . . well motivated and tested (effects can be included)


BELLE Principle of the Multi-Body Analysis

A. Giri, Y. Grossman, A. Soffer & J. Zupan, PRD 68, 054018 (2003)A. Poluektov et al. (Belle Collaboration), PRD 70, 072003 (2004)

• Consider D0 → KSπ+π−

→ define amplitude at each Dalitz plot point as f(m2+,m

2−)

where m+ = mKSπ+, m− = mKSπ

−

• Consider D0 → KSπ+π−

→ amplitude at each Dalitz plot point is f(m2−,m

2+)

•∣

∣

∣f(m2+,m

2−)

∣

∣

∣ can be measured using flavour tagged D mesons

• Consider B+ →(

KSπ+π−

)

DK+

→ amplitude is f(m2+,m

2−) + rBe

i(δB+φ3)f(m2−,m

2+)

• Consider B− →(

KSπ+π−

)

DK−

→ amplitude is f(m2−,m

2+) + rBe

i(δB−φ3)f(m2+,m

2−)

• Can extract (rB, δB, φ3) from B+ & B− data


BELLE B± → D(∗)K(∗)± Selection253

fb−1

BELLE-CONF-0476,BELLE-CONF-0502

B± → DK± B± → D∗K± B± → DK∗±

0

20

40

60

80

100

-0.2 -0.15 -0.1 -0.05 0 0.05 0.1 0.15 0.2∆E (GeV)

Ent

ries/

10 M

eV

0

2.5

5

7.5

10

12.5

15

17.5

20

22.5

-0.2 -0.15 -0.1 -0.05 0 0.05 0.1 0.15 0.2∆E (GeV)

Ent

ries/

10 M

eV

0

2

4

6

8

10

12

14

16

-0.2-0.15-0.1-0.05 0 0.050.10.150.2∆E (GeV)

Ent

ries/

10 M

eV

0

10

20

30

40

50

60

70

80

5.2 5.22 5.24 5.26 5.28 5.3Mbc (GeV/c2)

Ent

ries/

2 M

eV

0

2

4

6

8

10

12

14

16

5.2 5.22 5.24 5.26 5.28 5.3Mbc (GeV/c2)

Ent

ries/

2 M

eV

0

2

4

6

8

10

12

14

5.2 5.22 5.24 5.26 5.28 5.3Mbc (GeV/c2)

Ent

ries/

2 M

eV

276 candidate events 69 candidate events 56 candidate events(209 ± 16 signal) (58 ± 8 signal) (36 ± 7 signal)


BELLE B± → DK(∗)±, D → KSπ+π− Dalitz Plot Distributions

253

fb−1


B± → DK± B± → D∗K± B± → DK∗±

f(m

2 +,m

2 −)+

r Bei

(δ B

+φ

3)f(m

2 −,m

2 +)

0.5

1

1.5

2

2.5

3

0.5 1 1.5 2 2.5 3m2

+ (GeV2/c4)

m2 - (

GeV

2 /c4 )

0.5

1

1.5

2

2.5

3

0.5 1 1.5 2 2.5 3m2

+ (GeV2/c4)

m2 - (

GeV

2 /c4 )

0.5

1

1.5

2

2.5

3

0.5 1 1.5 2 2.5 3m2

+ (GeV2/c4)

m2 - (

GeV

2 /c4 )

f(m

2 −,m

2 +)+

r Bei

(δ B

−φ

3)f(m

2 +,m

2 −)

0.5

1

1.5

2

2.5

3

0.5 1 1.5 2 2.5 3m2

- (GeV2/c4)

m2 +

(GeV

2 /c4 )

0.5

1

1.5

2

2.5

3

0.5 1 1.5 2 2.5 3m2

- (GeV2/c4)

m2 +

(GeV

2 /c4 )

0.5

1

1.5

2

2.5

3

0.5 1 1.5 2 2.5 3m2

- (GeV2/c4)

m2 +

(GeV

2 /c4 )


BELLE Extraction of f(m2+,m

2−)

253

fb−1


• Fit Dalitz plot distribution of tagged D mesons from e+e− continuum

• Tag using charge of πs in D∗+ → D0π+s

• Used model defines phase variation of f(m2+,m

2−)

0

1

2

3

0 0.5 1 1.5 2 2.5 3m2

- (GeV2/c4)

Ent

ries/

0.02

GeV

2 /c4 ×

103

0

1

2

3

4

0 0.5 1 1.5 2 2.5 3m2

ππ (GeV2/c4)

Ent

ries/

0.02

GeV

2 /c4 ×

103

0

5

10

15

0 0.5 1 1.5 2 2.5 3m2

+ (GeV2/c4)

Ent

ries/

0.02

GeV

2 /c4 ×

103

χ2/ndf = 2.30

(ndf = 1106)

Fine tuning of model little effect on φ3


BELLE Dalitz Plot Fits253

fb−1


Fit B± samples separately, float rBei(δB±φ3)

B± → DK± B± → D∗K± B± → DK∗±

-0.4

-0.3

-0.2

-0.1

0

0.1

0.2

0.3

0.4

-0.4 -0.2 0 0.2 0.4Re(r e iθ)

Im(r

eiθ)

B+→DK+

B-→DK-

-0.6

-0.4

-0.2

0

0.2

0.4

0.6

-0.5 -0.25 0 0.25 0.5Re(r e iθ)

Im(r

eiθ)

B-→D*K-

B+→D*K+

-1

-0.5

0

0.5

1

-1 -0.5 0 0.5 1Re(r e iθ)

Im(r

eiθ)

B+→DK*+

B-→DK*-

276 candidate events 69 candidate events 56 candidate events(209 ± 16 signal) (58 ± 8 signal) (36 ± 7 signal)


BELLE Extraction of φ3253

fb−1


Avoid fit likelihood errors → use frequentist approach to obtain confidence regions

(recall rB and δB different for each mode)

B± → DK±

φ3 = 64◦ ± 19◦(stat) ± 13◦(syst) ± 11◦(model)rB = 0.21 ± 0.08(stat) ± 0.03(syst) ± 0.04(model)δB = 157◦ ± 19◦(stat) ± 11◦(syst) ± 21◦(model)

B± → D∗K±

φ3 = 75◦ ± 57◦(stat) ± 11◦(syst) ± 11◦(model)

rB = 0.12+0.16−0.11(stat) ± 0.02(syst) ± 0.04(model)

δB = 321◦ ± 57◦(stat) ± 11◦(syst) ± 21◦(model)

B± → DK∗±

φ3 = 112◦ ± 35◦(stat) ± 9◦(syst) ± 14◦(model)rB = 0.25 ± 0.18(stat) ± 0.09(syst) ± 0.09(model)δB = 353◦ ± 35◦(stat) ± 8◦(syst) ± 54◦(model)

B± → DK± & B± → D∗K± combined

φ3 = 68◦ +14◦

−15◦ (stat) ± 13◦(syst) ± 11◦(model)


BELLE Time-Dependent CP Violation Phenomenology

• Interference between different paths to a final state ⇒ time-dependent CP violation

• Consider B0/B0 decaying to a CP eigenstate

• Define λCP = qpAA

– p, q from B0 − B0 mixing– Standard Model : qp ∼ e−2φ1

• Simplest scenario:

–∣

∣

∣

qp

∣

∣

∣ = 1,∣

∣

∣

AA

∣

∣

∣ = 1 ⇒ SCP = Im(λCP )

• At B factories, measure ∆t from decay time of other B(tagged as B0 (q = +1) or B0 (q = −1))

PqCP (∆t) = e

−|∆t|/τB0

4τB0

[1 + q {SCP sin(∆m∆t)}]

B0

B– 0

fCP∆m

A

A–


BELLE How To Measure Time-Dependent CP Violation

Illustrated using B0 → J/ψKS, B0 → D∗−µ+νµ

electron

(8GeV)

positron

(3.5GeV)

�²(4S)resonance

J/�µ

Ks

µ+

µ−

µ+

K+

π−

π−

νµ

π+

π−

∆Z~200µm

B2

t=0

B1

D0

B0

B0

t=t


BELLE B0 → J/ψK0 Selection357

fb−1

BELLE-CONF-0569

B0 → J/ψKS B0 → J/ψKL

M (GeV/c )bc2

5.2 5.22 5.24 5.26 5.3

1600

1400

1200

1000

800

600

400

200

0

J/ψ K (π π ) S+ -

386 M BB

Eve

nts

/2M

eV

/c2

5.28

0

(GeV/c)cmsBp

0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2N

umbe

r of

eve

nts

/ (0.

05 G

eV/c

)0

500

1000

1500

2000

2500 data

LKΨJ/

detectedLX BG, KLKΨJ/

X BG, otherΨJ/

combinatorial BG

5264 ± 73 signal events 4792 ± 105 signal events


BELLE B0 → J/ψK0 — ∆t Dependence357

fb−1

BELLE-CONF-0569


t (ps)∆-8 -6 -4 -2 0 2 4 6 8

Eve

nts

/ ps

(goo

d ta

gs)

50

100

150

200

250

300q = +1

q = -1

t (ps)∆-8 -6 -4 -2 0 2 4 6 8

Raw

asy

mm

etry

(go

od ta

gs)

-1

-0.5

0

0.5

1

t (ps)∆-8 -6 -4 -2 0 2 4 6 8

Eve

nts

/ ps

(goo

d ta

gs)

100

200

300

400q = +1

q = -1

t (ps)∆-8 -6 -4 -2 0 2 4 6 8

Raw

asy

mm

etry

(go

od ta

gs)

-1

-0.5

0

0.5

1

S = +0.668 ± 0.047(stat) S = −0.619 ± 0.069(stat)A = −0.021 ± 0.034(stat) A = +0.049 ± 0.039(stat)


BELLE B0 → J/ψK0 — World Average357

fb−1

BELLE-CONF-0569

Belle: sin(2φ1) = +0.652 ± 0.039 ± 0.020

sin(2β)/sin(2φ1)

-2 -1 0 1 2 3

BaBarPRL 94, 161803 (2005)

0.72 ± 0.04 ± 0.02

BelleBELLE-CONF-0569

0.65 ± 0.04 ± 0.02

ALEPHPLB 492, 259-274 (2000)

0.84 +-01

.

.80

24 ± 0.16

OPALEPJ C5, 379-388 (1998)

3.20 +-12

.

.80

00 ± 0.50

CDFPRD 61, 072005 (2000)

0.79 +-00

.

.44

14

AverageHFAG

0.69 ± 0.03

H F A GH F A GHEP 2005

PRELIMINARY

World Average: sin(2φ1) = +0.687 ± 0.032


BELLE sin(2φ1) — Constraint

β/φ1

ρ–

η–

-0.2 0 0.2 0.4 0.6 0.8 1-0.2

0

0.2

0.4

0.6

0.8

1

β/φ1 = (21.7 +

-1

1.

.3

2)˚β/φ

1 = (68.3 +- 11 .. 23 )˚


PRELIMINARY


BELLE UT angles — Summary

(0,0) (1,0)

(ρ,η)

φ1

φ2φ3

VudVub*

VcdVcb*

VtdVtb*

VcdVcb*

φ1 φ2 φ3

B0 → J/ψK0 B0 → π+π− & ρ+ρ− B± → DK±

sin(2φ1) = +0.652 ± 0.039 ± 0.020 φ2 = 93+12−11

◦

φ3 = 68◦ +14◦

−15◦ (stat) ± 13◦(syst) ± 11◦(model)

Ambiguities reduced byJ/ψK∗ & D(∗)h0 π+π−π0 D.P. (BaBar) D → KSπ

+π− D.P.


BELLE UT angles — Summary

Plots from UTFit Collaboration

ρ-1 -0.5 0 0.5 1

η

-0.2

0

0.2

0.4

0.6

0.8

1

1.2

βsin2

0π0D

βcos2α

γ+β2

γ

ρ-1 -0.5 0 0.5 1

η

-0.2

0

0.2

0.4

0.6

0.8

1

1.2

ρ-1 -0.5 0 0.5 1

η

-0.2

0

0.2

0.4

0.6

0.8

1

1.2

βsin2

dm∆ sm∆dm∆

Kε

cbVubV

ρ-1 -0.5 0 0.5 1

η

-0.2

0

0.2

0.4

0.6

0.8

1

1.2

ρ-1 -0.5 0 0.5 1

η

-0.2

0

0.2

0.4

0.6

0.8

1

1.2

βsin2

0π0D

βcos2α

γ+β2

γ

dm∆ sm∆dm∆

Kε

cbVubV

ρ-1 -0.5 0 0.5 1

η

-0.2

0

0.2

0.4

0.6

0.8

1

1.2


BELLE Penguins


BELLE Why Hunt Penguins?

b s,d

gγZ

u,c,t

W

q,l q,l

• loop diagrams ⇒ virtual particles ⇒ high masses

• expect new physics at TeV scale

• NP particles should appear in loops

• no reason for NP phases to be aligned

• many possible manifestations of NP– b→ s vs. b→ d

– gluonic vs. radiative vs. electroweak– ∆B = 2 (mixing) processes


BELLE B0 → φK0357

fb−1

BELLE-CONF-0569

φKS φKL

0

10

20

30

40

50

60

70

-0.2-0.15-0.1-0.05 0 0.05 0.1 0.15 0.2∆E(GeV)

Ent

ries

/ 0.0

1 G

eV

Likelihood ratio0.8 0.85 0.9 0.95 1

Eve

nts

/ 0.0

2

0

20

40

60

80

100

120

140 data

LKφ

BG from B mesons

BG from continuum

180 ± 16 78 ± 13

∆t(ps)

Raw

Asy

mm

etry

-1

-0.5

0

0.5

1 B0 → φKS0

0.0 < r ≤ 0.5

-1

-0.5

0

0.5

1

-7.5 -5 -2.5 0 2.5 5 7.5

0.5 < r ≤ 1.0

∆t(ps)

Raw

Asy

mm

etry

-1

-0.5

0

0.5

1 B0 → φKL0

0.0 < r ≤ 0.5

-1

-0.5

0

0.5

1

-7.5 -5 -2.5 0 2.5 5 7.5

0.5 < r ≤ 1.0

sin(2φ1eff) = +0.44 ± 0.27 ± 0.05 A = +0.14 ± 0.17 ± 0.07


BELLE B0 → η′K0357

fb−1

BELLE-CONF-0569

η′KS η′KL

0

25

50

75

100

125

150

175

200

225

250

-0.2-0.15-0.1-0.05 0 0.05 0.1 0.15 0.2∆E(GeV)

Ent

ries

/ 0.0

1 G

eV

Likelihood ratio0.8 0.85 0.9 0.95 1

Eve

nts

/ 0.0

1

0

20

40

60

80

100data

L’Kη

BG from B mesons

BG from continuum

830 ± 35 187 ± 18

∆t(ps)

Raw

Asy

mm

etry

-1

-0.5

0

0.5

1 B0 → η′KS0

0.0 < r ≤ 0.5

-1

-0.5

0

0.5

1

-7.5 -5 -2.5 0 2.5 5 7.5

0.5 < r ≤ 1.0

∆t(ps)

Raw

Asy

mm

etry

-1

-0.5

0

0.5

1 B0 → η′KL0

0.0 < r ≤ 0.5

-1

-0.5

0

0.5

1

-7.5 -5 -2.5 0 2.5 5 7.5

0.5 < r ≤ 1.0

sin(2φ1eff) = +0.62 ± 0.12 ± 0.04 A = −0.04 ± 0.08 ± 0.06


BELLE b→ qqs357

fb−1

BELLE-CONF-0569

KSKSKS K+K−KS f0KS ωKS KSπ0

0

10

20

30

40

50

60

-0.2 0 0.2∆E (GeV)

Eve

nts/

0.02

GeV

0

25

50

75

100

125

150

175

200

225

-0.2-0.15-0.1-0.05 0 0.05 0.1 0.15 0.2∆E(GeV)

Ent

ries

/ 0.0

1 G

eV

E (GeV)∆-0.1 -0.05 0 0.05 0.1 0.15 0.2 0.25 0.3

Eve

nts

/ ( 0

.010

5 G

eV )

0

10

20

30

40

50

60

70

80

E (GeV)∆-0.1 -0.05 0 0.05 0.1 0.15 0.2 0.25 0.3

Eve

nts

/ ( 0

.010

5 G

eV )

0

10

20

30

40

50

60

70

80

0

5

10

15

20

25

-0.2-0.15-0.1-0.05 0 0.05 0.1 0.15 0.2∆E(GeV)

Ent

ries

/ 0.0

1 G

eV

0

10

20

30

40

50

60

70

80

-0.2-0.15-0.1-0.05 0 0.05 0.1 0.15 0.2∆E (GeV)

Ent

ries

/ 0.0

1 G

eV

105 ± 12 536 ± 29 145 ± 16 68 ± 13 344 ± 30

-1

-0.5

0

0.5

1

0.0 < r ≤ 0.5

-1

-0.5

0

0.5

1

-7.5 -5 -2.5 0 2.5 5 7.5∆t (ps)

0.5 < r ≤ 1.0

Raw

Asy

mm

etry

/2.5

ps

∆t(ps)

Raw

Asy

mm

etry

-1

-0.5

0

0.5

1 B0 → K+K-K0S

0.0 < r ≤ 0.5

-1

-0.5

0

0.5

1

-7.5 -5 -2.5 0 2.5 5 7.5

0.5 < r ≤ 1.0

-1

-0.5

0

0.5

1

0.0 < r ≤ 0.5

B0 → f0 KS0

-1

-0.5

0

0.5

1

-7.5 -5 -2.5 0 2.5 5 7.5

0.5 < r ≤ 1.0

∆t (ps)

Raw

Asy

mm

etry

∆t(ps)

Raw

Asy

mm

etry

-1

-0.5

0

0.5

1 B0 → ωKS0

0.0 < r ≤ 0.5

-1

-0.5

0

0.5

1

-7.5 -5 -2.5 0 2.5 5 7.5

0.5 < r ≤ 1.0

-1

-0.5

0

0.5

1

0.0 < r ≤ 0.5

-1

-0.5

0

0.5

1

-7.5 -5 -2.5 0 2.5 5 7.5∆t (ps)

0.5 < r ≤ 1.0

Raw

Asy

mm

etry

/2.5

ps


BELLE b→ qqs357

fb−1

BELLE-CONF-0569

sin(2βeff)/sin(2φe1ff)

HF

AG

HE

P 2

005

HF

AG

HE

P 2

005

HF

AG

HE

P 2

005

HF

AG

HE

P 2

005

HF

AG

HE

P 2

005

HF

AG

HE

P 2

005

HF

AG

HE

P 2

005

HF

AG

HE

P 2

005

b→ccs

φ K

0η′

K0

f 0 K

S

π0 KS

ω K

S

K+ K

- K0

KS K

S K

S

-1 0 1 2

World Average 0.69 ± 0.03BaBar 0.50 ± 0.25 +-

00

.

.00

74

Belle 0.44 ± 0.27 ± 0.05Average 0.47 ± 0.19BaBar 0.36 ± 0.13 ± 0.03Belle 0.62 ± 0.12 ± 0.04Average 0.50 ± 0.09BaBar 0.95 +-

00

.

.23

32 ± 0.10

Belle 0.47 ± 0.36 ± 0.08Average 0.75 ± 0.24BaBar 0.35 +-

00

.

.33

03 ± 0.04

Belle 0.22 ± 0.47 ± 0.08Average 0.31 ± 0.26BaBar 0.50 +-

00

.

.33

48 ± 0.02

Belle 0.95 ± 0.53 +-00

.

.11

25

Average 0.63 ± 0.30BaBar 0.41 ± 0.18 ± 0.07 ± 0.11Belle 0.60 ± 0.18 ± 0.04 +-

00

.

.11

92

Average 0.51 ± 0.14 +-00

.

.10

18

BaBar 0.63 +-00

.

.23

82 ± 0.04

Belle 0.58 ± 0.36 ± 0.08Average 0.61 ± 0.23


PRELIMINARY

Cf = -Af

HF

AG

HE

P 2

005

HF

AG

HE

P 2

005

HF

AG

HE

P 2

005

HF

AG

HE

P 2

005

HF

AG

HE

P 2

005

HF

AG

HE

P 2

005

HF

AG

HE

P 2

005

φ K

0

η′ K

0f 0

KS

π0 KS

ω K

S

K+ K

- K0

KS K

S K

S

-1.6 -1.4 -1.2 -1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1 1.2

BaBar 0.00 ± 0.23 ± 0.05

Belle -0.14 ± 0.17 ± 0.07

Average -0.09 ± 0.14

BaBar -0.16 ± 0.09 ± 0.02

Belle 0.04 ± 0.08 ± 0.06

Average -0.07 ± 0.07

BaBar -0.24 ± 0.31 ± 0.15

Belle 0.23 ± 0.23 ± 0.13

Average 0.06 ± 0.21

BaBar 0.06 ± 0.18 ± 0.03

Belle -0.11 ± 0.18 ± 0.08

Average -0.02 ± 0.13

BaBar -0.56 +-00

.

.22

97 ± 0.03

Belle -0.19 ± 0.39 ± 0.13

Average -0.44 ± 0.23

BaBar 0.23 ± 0.12 ± 0.07

Belle 0.06 ± 0.11 ± 0.07

Average 0.14 ± 0.10

BaBar -0.10 ± 0.25 ± 0.05

Belle -0.50 ± 0.23 ± 0.06

Average -0.31 ± 0.17


PRELIMINARY


BELLE B0 → KSπ0γ — Time-Dependent CP Violation

386

fb−1

BELLE-CONF-0570

Time-dependence probes γ polarization

∆t (ps)

Raw

asy

mm

etry

/(2.

5 ps

)

-1

-0.75

-0.5

-0.25

0

0.25

0.5

0.75

1

-7.5 -5 -2.5 0 2.5 5 7.5

Invariant mass region: 0.8 GeV/c2 < mKSπ0 < 1.8 GeV/c2

70 ± 11 signal events

SKSπ0γ = +0.08 ± 0.41(stat) ± 0.10(stat)

CKSπ0γ = −0.12 ± 0.27(stat) ± 0.10(stat)


BELLE Belle: B → K∗l+l− — F-B asymmetry386

fb−1

BELLE-CONF-0521

Measure Wilson coefficients (A7, A9, A10); find AFB = 0 point

0

10

20

30 (a) K+ e+e-

Eve

nts

/ 2.0

MeV

/c2

(b) K* e+e-

0

10

20

30(c) K+ µ+µ- (d) K* µ+µ-

0

20

40

60

5.2 5.225 5.25 5.275

(e) K+ l+l-

5.2 5.225 5.25 5.275 5.3

(f) K* l+l-

Mbc (GeV/c2)

-1

-0.5

0

0.5

1

0 2.5 5 7.5 10 12.5 15 17.5 20 22.5 25q2 GeV2/c2

AF

B (

bkg-

sub)

(a) K+ l+ l-

-1

-0.5

0

0.5

1

0 2 4 6 8 10 12 14 16 18 20q2 GeV2/c2

AF

B (

bkg-

sub)

K* l+ l-negative A7

A9A10 > 0 excluded at 95% CL


BELLE b→ dγ357

fb−1

BELLE-CONF-0520

E (GeV)∆-0.4 -0.2 0 0.2 0.4

Ent

ries/

(50

MeV

)

0

2

4

6

8

10

12 γ-ρ → -B

)2 (GeV/cbcM5.2 5.22 5.24 5.26 5.28 5.3

)2E

ntrie

s/(4

MeV

/c

0

2

4

6

8

10

12

14

γ-ρ → -B

E (GeV)∆-0.4 -0.2 0 0.2 0.4

Ent

ries/

(50

MeV

)

0

2

4

6

8

10

12

14

16

18

γ0ρ → 0

B

)2 (GeV/cbcM5.2 5.22 5.24 5.26 5.28 5.3

)2E

ntrie

s/(4

MeV

/c

0

2

4

6

8

10

12

14 γ0ρ → 0

B

E (GeV)∆-0.4 -0.2 0 0.2 0.4

Ent

ries/

(50

MeV

)

0

1

2

3

4

5γω →

0B

)2 (GeV/cbcM5.2 5.22 5.24 5.26 5.28 5.3

)2E

ntrie

s/(4

MeV

/c

0

1

2

3

4

5γω →

0B

Assuming isospin relation:

B (B → (ρ, ω)γ) =(

1.34+0.34−0.31

+0.14−0.10

)

× 10−6

Significance: 5.5σ

|Vtd/Vts| = 0.200+0.026−0.025 (exp)+0.038

−0.029(theo)


BELLE Super B Factory


BELLE Super B Factory

• Luminosity frontier probes new physics . . . complementary to energy frontier

• eg. When LHC discovers SUSY, Super B can help identify SUSY breakingmechanism

• Argument for B physics (& flavour physics) well established. . . important relation to baryon asymmetry of the Universe

• Complementarity between LHCb and Super B becoming clearer– Super B only: modes with neutrals, neutrinos, difficult topologies

– LHCb only: modes with Bs, other heavy B hadrons

– Overlap: eg. Bd → π+π−, DK∗0 to keep us honest

– ATLAS/CMS: very rare modes (eg. Bd,s → µ+µ−)


BELLE Fundamental Questions

• What: Origin of flavour mixing and CP violation

• Why: Matter dominated universe

• How: Flavour structure in and beyond Standard Model

• Are there new CP violating phases?b→ s TDCPV; UT from tree vs loops; ∆B = 2 & ∆B = 1

• Are there new right-handed currents?b→ sγ TDCPV etc.; B → V V polarization

• Are there new operators enhanced by new physics?B → K∗l+l− AFB; B → Kπ, ππ rates & asymmetries

• Are there new FCNCs? (b,c or τ )b→ sνν; τ → µγ etc.; DD mixing, CPV, etc.

Data sample of ∼ 50 ab−1 @ Υ(4S) needed to address these questions


BELLE Super B Factory Parameters


BELLE Super B Factory Upgrade


BELLE Crab Cavities

• Head-on collision with finitecrossing angle

• Superconducting crab cavitiesunder development

• Will be tested in early 2006


BELLE Super B Factory Detector


BELLE Super B Factory Detector

• Issues– Higher background– Higher event rate– Special features:

low p µ-ID; hermiticity ⇒ ν reconstruction; KS vertexing

• Possible solutions (nothing is fixed)– Inner SVD ⇒ striplets– Inner tracker ⇒ silicon– Outer tracker ⇒ fast gas– PID ⇒ “TOP”; RICH; FDIRC . . .– Endcap calorimeter ⇒ pure CsI– KLM ⇒ tile scintillator– Fast trigger & read out; improved DAQ & computing


BELLE Super B Factory Luminosity


BELLE Summary

• KEKB is running well, Belle has more and more data to analyze

• Many new and improved results, and more coming soon . . .

• Significant CPV effects appearing in many modes

• Amplitude analyses opening new vistas for B physics

• What I have shown is only a fraction

http://belle.kek.jp/conferences/CONF2005/

• All results shown here are preliminary


BELLE Back Up

Back Up


BELLE Υ(5S) Data Taking

Short engineering run has been performed (∼ 2 fb−1 on Υ(5S))

bwy5sd.f

N hadron (R2<0.2) / N BhabhaM = 10868 ± 16 MeV/c2

Γ = 110 MeV/c2

(Γ = 105 ± 29 MeV/c2)Const = 35.1 ± 1.9

χ2 = 5.8 / 2

f(M) = BW + Const

M, (GeV/c2)

Rat

io, %

38

40

42

44

46

48

50

10.8 10.82 10.84 10.86 10.88 10.9 10.92 10.94

Υ(5S) data taking at high luminosity is possible


BELLE Identifying SUSY Breaking


BELLE Crab Cavities


BELLE Search for Θ(1540)+ Using Kaon Interactions397

fb−1

BELLE-CONF-0518

0

2000

4000

6000

8000

1.4 1.45 1.5 1.55 1.6 1.65 1.7

Λ(1520) clearly seen in pK−

No signal for Θ(1540)+ in pKSTim Gershon University of Oxford Seminar January 24, 2006

BELLE Not covered

• D physics

• τ physics

• ISR physics

• γγ physics

• spectroscopy & exotics

• Rare (& not-so-rare) b→ c decays

• Many other rare decays

• b→ ulν

• b→ clν

• . . .


BELLE CP Violation — Summary

Direct CP violation seen by Belle:

• B0 → K+π− (∼ 10% ∼ 5σ)

• B0 → π+π− (∼ 50% ∼ 4σ)

• B+ → ρ0K+ (∼ 30% ∼ 4σ)

Time-dependent CP violation seen by Belle:• B0 → J/ψK0 (∼ 65% >> 5σ)

• B0 → π+π− (∼ 65% > 5σ)

• B0 → η′K0 (∼ 60% ∼ 5σ)


BELLE B+ → D(∗)K+ DP Analysis History

• First results shown at Lepton-Photon 2003– B− → DK− & B− → D∗K−, D∗ → Dπ0

– 140 fb−1

– Published in PRD 70, 072003 (2004)

• Update with 250 fb−1 at FPCP 2004– hep-ex/0411049

• First results with B− → DK∗− at Moriond QCD 2005 / CKM2005– Not included in combined average yet– hep-ex/0504013

• Only D → KSπ+π− used so far


BELLE Measurement of f(m2+,m

2−) - Results

Resonance Amplitude Phase (◦) FractionKSσ1 1.57 ± 0.10 214 ± 4 9.8%KSρ

0 1.0 (fixed) 0 (fixed) 21.6%KSω 0.0310 ± 0.0010 113.4 ± 1.9 0.4%KSf0(980) 0.394 ± 0.006 207 ± 3 4.9%KSσ2 0.23 ± 0.03 210 ± 13 0.6%KSf2(1270) 1.32 ± 0.04 348 ± 2 1.5%KSf0(1370) 1.25 ± 0.10 69 ± 8 1.1%KSρ

0(1450) 0.89 ± 0.07 1 ± 6 0.4%K∗(892)+π− 1.621 ± 0.010 131.7 ± 0.5 61.2%K∗(892)−π+ 0.154 ± 0.005 317.7 ± 1.6 0.55%K∗(1410)+π− 0.22 ± 0.04 120 ± 14 0.05%K∗(1410)−π+ 0.35 ± 0.04 253 ± 6 0.14%K∗

0(1430)+π− 2.15 ± 0.04 348.7 ± 1.1 7.4%

K∗0(1430)

−π+ 0.52 ± 0.04 89 ± 4 0.43%K∗

2(1430)+π− 1.11 ± 0.03 320.5 ± 1.8 2.2%

K∗2(1430)

−π+ 0.23 ± 0.02 263 ± 7 0.09%K∗(1680)+π− 2.34 ± 0.26 110 ± 5 0.36%K∗(1680)−π+ 1.3 ± 0.2 87 ± 11 0.11%nonresonant 3.8 ± 0.3 157 ± 4 9.7%


BELLE Systematic Errors

B± → DK± B± → D∗K±

Source ∆rB ∆φ3 ∆δB ∆rB ∆φ3 ∆δBBackground shape 0.027 5.7◦ 4.1◦ 0.014 3.1◦ 5.3◦

Background fraction 0.006 0.2◦ 1.0◦ 0.005 0.7◦ 1.4◦

Efficiency shape 0.012 4.9◦ 2.4◦ 0.002 3.5◦ 1.0◦

Momentum resolution 0.002 0.3◦ 0.3◦ 0.002 1.7◦ 1.4◦

Control sample bias 0.004 10.2◦ 10.2◦ 0.004 9.9◦ 9.9◦

Total 0.030 12.7◦ 11.3◦ 0.016 11.1◦ 11.4◦


BELLE Model Uncertainty

f(m2+,m

2−) =

∣

∣

∣f(m2+,m

2−)

∣

∣

∣ eiφ(m2

+,m2−)

• Fit to flavour tagged D sample measures∣

∣

∣f(m2+,m

2−)

∣

∣

∣

BUT φ(m2+,m

2−) model-dependent

• Estimate model uncertainty by varying model

Fit model (∆rB)max (∆φ3)max (∆δB)max

Meson formfactors Fr = FD = 1 0.01 3.1◦ 3.3◦

Constant BW width Γ(q2) 0.02 4.7◦ 9.0◦

Only K∗, ρ, ω, f0 non-resonant 0.03 9.9◦ 18.2◦

Total 0.04 11◦ 21◦

• Consider CP -tagged D mesons decaying to KSπ+π−

→ amplitude is f(m2+,m

2−) ± f(m2

−,m2+)

• FUTURE: use CP tagged D mesons from cτ factory (ψ′′ → DD)→ measure φ(m2

+,m2−) ⇒ remove model uncertainty


BELLE Test Samples253

fb−1


Fit B, B samples separately, float rB±eiθ±, where θ± = δB ± φ3

B± →(

KSπ+π−

)

Dπ±

(r ∼ 0.01)

-0.15

-0.1

-0.05

0

0.05

0.1

0.15

-0.15 -0.1 -0.05 0 0.05 0.1 0.15Re(r e iθ)

Im(r

eiθ)

B+

B-

3425 events

rB− = 0.047 ± 0.018

θ− = 193◦ ± 24◦

rB+ = 0.039 ± 0.021

θ− = 240◦ ± 28◦

B± →((

KSπ+π−

)

Dπ0

)

D∗π±

(rB ∼ 0.01)

-0.3

-0.2

-0.1

0

0.1

0.2

0.3

-0.3 -0.2 -0.1 0 0.1 0.2 0.3Re(r e iθ)

Im(r

eiθ)

B+

B-

641 events

rB− = 0.086 ± 0.049

θ− = 280◦ ± 30◦

rB+ = 0.015 ± 0.042

θ− = 170◦ ± 186◦


BELLE B− → D(∗)CPK

− — Observables

• Reconstruct D(∗) mesons in CP even (D(∗)1 ), CP odd (D(∗)

2 )

and flavour-specific favoured (D(∗)fav) decay modes

• CP asymmetries

AD

(∗)1,2K

−=

Γ(

B−→D(∗)1,2K

−)

−Γ(

B+→D(∗)1,2K

+)

Γ(

B−→D(∗)1,2K

−)

+Γ(

B+→D(∗)1,2K

+)

AD

(∗)1 K−

=2rB sin(δB) sin(φ3)

1+rB2+2rB cos(δB) cos(φ3)

AD

(∗)2 K−

=−2rB sin(δB) sin(φ3)

1+rB2−2rB cos(δB) cos(φ3)

• Charge averaged rates, normalized to B− → Dπ−

R1,2 =

Γ(

B−→D(∗)1,2K

−)

+Γ(

B+→D(∗)1,2K

+)

Γ(

B−→D(∗)favK

−)

+Γ(

B+→D(∗)favK

+)

/

Γ(

B−→D(∗)1,2π

−)

+Γ(

B+→D(∗)1,2π

+)

Γ(

B−→D(∗)favπ

−)

+Γ(

B+→D(∗)favπ

+)

R1 = 1 + rB2 + 2rB cos(δB) cos(φ3) R2 = 1 + rB

2 − 2rB cos(δB) cos(φ3)

• Four observables, three unknowns . . .( rB, δB ) different for B∓ → DK∓, B∓ → D∗K∓


BELLE B− → D(∗)CPK

− — Summary253

fb−1

BELLE-CONF-0443

• Extract CP asymmetries by fitting B− and B+ yields separately

PRELIMINARY

B∓ → DK∓ B∓ → D∗K∓

A1 0.07 ± 0.14(stat) ± 0.06(syst) −0.27 ± 0.25(stat) ± 0.04(syst)A2 −0.11 ± 0.14(stat) ± 0.05(syst) 0.26 ± 0.26(stat) ± 0.03(syst)R1 0.98 ± 0.18(stat) ± 0.10(syst) 1.43 ± 0.28(stat) ± 0.06(syst)R2 1.29 ± 0.16(stat) ± 0.08(syst) 0.94 ± 0.28(stat) ± 0.06(syst)

• First observations of B∓ → D∗1,2K

∓ . . .and first measurements of A1,2 in D∗

CPK∓ system


BELLE World Averages

RCP Averages

HF

AG

LP 2

005

HF

AG

LP 2

005

HF

AG

LP 2

005

HF

AG

LP 2

005

HF

AG

LP 2

005

HF

AG

LP 2

005

DC

P K

RC

P+

DC

P K

RC

P-

D* C

P K

RC

P+

D* C

P K

RC

P-

DC

P K

* R

CP

+

DC

P K

* R

CP

-

-1 0 1 2 3

BaBar 0.87 ± 0.14 ± 0.06

Belle 0.98 ± 0.18 ± 0.10

Average 0.91 ± 0.12

BaBar 0.80 ± 0.14 ± 0.08

Belle 1.29 ± 0.16 ± 0.08

Average 1.02 ± 0.12

BaBar 1.06 ± 0.26 +-00

.

.10

09

Belle 1.43 ± 0.28 ± 0.06

Average 1.24 ± 0.20

Belle 0.94 ± 0.28 ± 0.06

Average 0.94 ± 0.29

BaBar 1.96 ± 0.40 ± 0.11

Average 1.96 ± 0.41

BaBar 0.65 ± 0.26 ± 0.08

Average 0.65 ± 0.27

H F A GH F A GLP 2005

PRELIMINARY

ACP Averages

HF

AG

LP 2

005

HF

AG

LP 2

005

HF

AG

LP 2

005

HF

AG

LP 2

005

HF

AG

LP 2

005

HF

AG

LP 2

005

DC

P K

AC

P+

DC

P K

AC

P-

D* C

P K

AC

P+

D* C

P K

AC

P-

DC

P K

* A

CP

+

DC

P K

* A

CP

-

-1.4 -1.2 -1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1 1.2 1.4

BaBar 0.40 ± 0.15 ± 0.08

Belle 0.07 ± 0.14 ± 0.06

Average 0.22 ± 0.11

BaBar 0.21 ± 0.17 ± 0.07

Belle -0.11 ± 0.14 ± 0.05

Average 0.02 ± 0.12

BaBar -0.10 ± 0.23 +-00

.

.00

34

Belle -0.27 ± 0.25 ± 0.04

Average -0.18 ± 0.17

Belle 0.26 ± 0.26 ± 0.03

Average 0.26 ± 0.26

BaBar -0.08 ± 0.19 ± 0.08

Belle -0.02 ± 0.33 ± 0.07

Average -0.06 ± 0.18

BaBar -0.26 ± 0.40 ± 0.12

Belle 0.19 ± 0.50 ± 0.04

Average -0.08 ± 0.32

H F A GH F A GLP 2005

PRELIMINARY


BELLE New B− →[

K+π−]

DK− Analysis

PRELIMINARY

• Use 386 million BB pairs

• Use improved continuum suppression

• Other minor changes from PRL 94, 091601 (2005)


BELLE New ADS Analysis — B∓ → Dπ∓357

fb−1

BELLE-CONF-0552

B∓ →[

K∓π±]

Dπ∓ B∓ →

[

K±π∓]

Dπ∓

−0.20 −0.10 0.00 0.10 0.20∆E(GeV)

0

1000

2000

3000

4000

5000

Eve

nts/

10M

eV

−0.20 −0.10 0.00 0.10 0.20∆E(GeV)

0

10

20

30

40

50

60

Eve

nts/

10M

eV14518 ± 125 signal events 50+11

−10 signal events

RDπ = (3.5+0.8−0.7 (stat) ± 0.3 (syst)) × 10−3

Consistent with previous Belle result


BELLE B0 → J/ψK0 — ∆t Dependence (Poor quality tags)357

fb−1

BELLE-CONF-0569


t (ps)∆-8 -6 -4 -2 0 2 4 6 8

Eve

nts

/ ps

(poo

r ta

gs)

50

100

150

200

250

300

350q = +1

q = -1

t (ps)∆-8 -6 -4 -2 0 2 4 6 8

Raw

asy

mm

etry

(po

or ta

gs)

-1

-0.5

0

0.5

1

t (ps)∆-8 -6 -4 -2 0 2 4 6 8

Eve

nts

/ ps

(poo

r ta

gs)

100

200

300

400

500 q = +1

q = -1

t (ps)∆-8 -6 -4 -2 0 2 4 6 8

Raw

asy

mm

etry

(po

or ta

gs)

-1

-0.5

0

0.5

1

S = +0.668 ± 0.047(stat) S = −0.619 ± 0.069(stat)A = −0.021 ± 0.034(stat) A = +0.049 ± 0.039(stat)


BELLE Resolving the sin(2φ1) Ambiguity357

fb−1

BELLE-CONF-0546

• Utilize interference between CP -even & CP -odd final stateseg. B0 → J/ψK∗0 → J/ψKSπ

0 angular analysis

• New method uses analysis of (eg.) D → KSπ+π− Dalitz plot in

B0 → Dh0 decays (h0 = π0, η, . . .)

• Similar to B+ → DK+ analysis for φ3

• Test SM prediction: Sb→ccs ≃ Sb→cud

Dπ0 Dη Dω D∗π0&D∗η

0

10

20

30

40

50

60

70

80

-0.3 -0.2 -0.1 0 0.1 0.2 0.3

∆E, GeV

Eve

nts/

10

MeV

0

2

4

6

8

10

12

-0.3 -0.2 -0.1 0 0.1 0.2 0.3

∆E, GeV

Eve

nts/

10

MeV

0

2.5

5

7.5

10

12.5

15

17.5

20

-0.3 -0.2 -0.1 0 0.1 0.2 0.3

∆E, GeV

Eve

nts/

10

MeV

0

2.5

5

7.5

10

12.5

15

17.5

20

-0.3 -0.2 -0.1 0 0.1 0.2 0.3

∆E, GeV

Eve

nts/

10

MeV


BELLE Description of the Method (Pictures)A. Bondar, T.G., P. Krokovny, PLB 624, 1 (2005)

(Terms of e−|∆t|/τB0 have been dropped)

ΓB0(∆t) ∝

∣

∣

∣

∣

∣

∣

∣

∣

∣

∣

∣

∣

∣

∣

∣

∣

∣

cos

(

∆m∆t

2

)

− iΦ∗ sin

(

∆m∆t

2

)

∣

∣

∣

∣

∣

∣

∣

∣

∣

∣

∣

∣

∣

∣

∣

∣

∣

2

ΓB0(∆t) ∝

∣

∣

∣

∣

∣

∣

∣

∣

∣

∣

∣

∣

∣

∣

∣

∣

∣

cos

(

∆m∆t

2

)

− iΦ sin

(

∆m∆t

2

)

∣

∣

∣

∣

∣

∣

∣

∣

∣

∣

∣

∣

∣

∣

∣

∣

∣

2

Φ∗ = e−i2φ1ηh0(−1)l Φ = e+i2φ1ηh0(−1)l


BELLE sin(2φ1) — Constraint357

fb−1

BELLE-CONF-0546

φ1 = (16 ± 21 ± 11)◦

β/φ1

ρ–

η–

-0.2 0 0.2 0.4 0.6 0.8 1-0.2

0

0.2

0.4

0.6

0.8

1

β/φ1 = (21.7 +

-1

1.

.3

2 )˚β/φ

1 = (68.3 +- 11 .. 23 )˚

DIS

FA

VO

UR

ED

BY

J/ψK

* & D

h0


PRELIMINARY


BELLE B0 → ρ+ρ−253

fb−1

BELLE-CONF-0545

Initial attempts to extract φ2 have focussed on B0 → π+π−.However,• penguin pollution found to be large• B

(

B0 → π0π0)

≈ 1.5 × 10−6 (HFAG2005)• large direct CP violation:A

(

B0 → π+π−)

= 0.56 ± 0.12 ± 0.06 (Belle; PRL 95, 101801 (2005))

Isospin analysis possible; large statistical error & ambiguities

Recently,B0 → ρ+ρ− found to be powerful for measurement of φ2 because• small penguin pollution (B

(

B0 → ρ0ρ0)

< 1.1 × 10−6 (BaBar))

• surprisingly (?) little nonresonant contribution

• B0 → ρ+ρ− almost 100% longitudinally polarized(almost pure CP state . . . downside is cannot access interference)


BELLE B0 → ρ+ρ−253

fb−1

BELLE-CONF-0545

0102030405060708090

100

5.22 5.24 5.26 5.28 Mbc (GeV/c2)

Eve

nts

/ 2 M

eV

0

10

20

30

40

50

60

70

80

−0.2 −0.1 0 0.1 0.2 0.3∆E (GeV)

Eve

nts

/ 20

MeV

0

50

100

150

200

250

300

350

0.4 0.6 0.8 1 1.2 1.4 1.6 1.8

Mππ (GeV/c2)

Eve

nts

/ (60

MeV

)

0

20

40

60

80

100

120

140

160

-0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8cos θ

Eve

nts

/ (0.

089)

142 ± 13 signal events flong = 0.951+0.033−0.039

+0.029−0.031


BELLE B0 → ρ+ρ− — CP Fit253

fb−1

BELLE-CONF-0545

0

20

40

60

80

100

120

140

160

-5 0 5∆t (ps)

Eve

nts

/ (1.

25 p

s)

0

20

40

60

80

100

120

140

160

-5 0 5∆t (ps)∆t (ps)

Eve

nts

/ (1.

25 p

s)

-1

-0.75

-0.5

-0.25

0

0.25

0.5

0.75

1

-5 0 5∆t (ps)

Raw

Asy

mm

etry

/ (2

.5 p

s)

-1

-0.75

-0.5

-0.25

0

0.25

0.5

0.75

1

-5 0 5∆t (ps)

Raw

Asy

mm

etry

/ (2

.5 p

s)

S = 0.09 ± 0.41 ± 0.08 A = 0.00 ± 0.039+0.10−0.09


BELLE Constraint on φ2253

fb−1


ρρ only ππ & ρρ

φ2 = 87 ± 17◦ φ2 = 93+12−11

◦

(cf. φ2 = 87 ± 12◦ from naıve S = − sin(2φ2) neglecting penguins)


BELLE Description of the Method (Equations)

A. Bondar et al., hep-ph/0503174, to appear PLB• Assume CPT , take ∆Γ = 0, |q/p| = 1, arg(q/p) = 2φ1

• Neglect Cabibbo-suppressed contribution (for now)

• Ignore mixing, CP violation in D system

• Amplitude description (terms of e−|∆t|/2τB0 dropped)

∣

∣B0(∆t)⟩

=∣

∣B0⟩

cos(∆m∆t/2) − ie−i2φ1

∣

∣B0⟩

sin(∆m∆t/2)

∣

∣DB0(∆t)⟩

=∣

∣D0⟩

cos(∆m∆t/2) − ie−i2φ1ηh0(−1)l∣

∣D0⟩

sin(∆m∆t/2)

MB0(∆t) = f(m2−,m

2+)cos(∆m∆t/2) − ie−i2φ1ηh0(−1)lf(m2

+,m2−)sin(∆m∆t/2)

∣

∣B0(∆t)⟩

=∣

∣B0⟩

cos(∆m∆t/2) − ie+i2φ1

∣

∣B0⟩

sin(∆m∆t/2)

∣

∣DB0(∆t)⟩

=∣

∣D0⟩

cos(∆m∆t/2) − ie+i2φ1ηh0(−1)l∣

∣D0⟩

sin(∆m∆t/2)

MB0(∆t) = f(m2+,m

2−)cos(∆m∆t/2) − ie+i2φ1ηh0(−1)lf(m2

−,m2+)sin(∆m∆t/2)

ηh0 = CP eigenvalue of h0 l = angular momentum


BELLE B0 → D(∗)h0 Analysis357

fb−1

BELLE-CONF-0546

Process Ntot Efficiency (%) Nsig PurityDπ0 265 8.7 157 ± 24 59%Dω 78 4.1 67 ± 10 86%Dη 97 3.9 58 ± 13 60%D∗π0,D∗η 52 27 ± 11 52%Sum 492 309 ± 31 63%

Data fit results. Statistical errors from toy MC.Final state φ1 fit result, ◦

Dπ0 11 ± 26Dω, Dη 28 ± 32

D∗π0,D∗η 25 ± 35

Simultaneous fit 16 ± 21

Raw asymmetry.[

KSρ0]

Dh0 candidates.

-1

-0.5

0

0.5

1

-7.5 -5 -2.5 0 2.5 5 7.5

∆t, ps

Raw

Asy

mm

etry

/ 2.5

ps


BELLE B → π+π− Candidates253

fb−1

BELLE-CONF-0501

Categorize candidates based on level of qq background

High quality

0

50

100

150

200

250

-0.2 0 0.2 0.4∆E (GeV)

Eve

nts/

(0.0

2GeV

)

(a)Totalπ+π-

KπcontinuumThree-body

Low quality

050

100150200250300350400

-0.2 0 0.2 0.4∆E (GeV)

Eve

nts/

(0.0

2GeV

)

(b)


BELLE B → π+π− Analysis253

fb−1

BELLE-CONF-0501

Contributions from tree and penguin amplitudes

tree contains Vub

b u

uW

dd

d

penguin contains Vtd

b W

t u

u

dd

g

d

• Small branching fraction (∼ 4 × 10−6)

• Large background from e+e− → qq (q = u, d, s, c)

• Background from B → K+π−


BELLE B → π+π− Fit Result253

fb−1

BELLE-CONF-0501

∗ 2820 candidates ∗ ∗ 666 ± 43 π+π− signal events ∗

Sπ+π− = −0.67 ± 0.16 ± 0.06 Aπ+π− = +0.56 ± 0.12 ± 0.06

Plots for high quality events only

0

100

200

Eve

nts/

(1.2

5ps)

Totalπ+π-

Kπcontinuum

(a) q = +1

0

100

200

-5 0 5

Eve

nts/

(1.2

5ps)

∆t (ps)

Totalπ+π-

Kπcontinuum

(b) q = -1

-1

-0.5

0

0.5

1(c) 0.0<r≤0.5

Raw

Asy

mm

etry

-1

-0.5

0

0.5

1

-5 0 5

(d) 0.5<r≤1.0

∆t (ps)

Raw

Asy

mm

etry


BELLE B → π+π−253

fb−1

BELLE-CONF-0501

Yields from Mbc—∆E fits in bins of (q,∆t)

0

100

200

No.

of

π+ π- eve

nts

tagged as a B 0

tagged as a B– 0

-1

0

1

-5 0 5∆t (ps)

π+ π- asy

mm

etry

-1

-0.75

-0.5

-0.25

0

0.25

0.5

0.75

1

-1 -0.75 -0.5 -0.25 0 0.25 0.5 0.75 1

1-C.L. at (-0.62,0) = 5.13×10-5

1-C.L. at (0,0) = 5.62×10-8

SππA

ππ

• CP violation significance > 5σ (still)

• DIRECT CPV significance : 4σ


BELLE B → π+π− : Extraction of φ2253

fb−1

BELLE-CONF-0501

• Due to large penguin contribution need isospin analysis to extract φ2

• Such analyses are underway . . .

• Current limitation from knowledge of B0 → π0π0

– branching fraction– direct CP asymmetry

• Other avenues for φ2 (ρ±π∓, ρ±ρ∓, etc.) being explored


BELLE B0 → ρ0π0357

fb−1

BELLE-CONF-05

• Dalitz plot analysis of B0 → π+π−π0 can measure φ2 & resolve ambiguities

• Main contributions from ρ±π∓, other contributions complicate the analysis

(a) (b)

∆E (GeV)

Eve

nts

/ 20

MeV

Mbc (GeV/c2)

Eve

nts

/ 2.3

MeV

/c2

0

5

10

15

20

25

30

-0.2 0 0.2 0.40

5

10

15

20

25

30

35

40

5.24 5.26 5.28 5.3

Significance: 4.2σ

B(

B0 → ρ0π0)

=(

3.12+0.88−0.82

+0.60−0.76

)

× 10−6


BELLE B0 → ρ0π0357

fb−1

BELLE-CONF-05

(c) (d)

mπ+π− (GeV/c2)

Yie

lds

/ 250

MeV

/c2

cos θρhel

Yie

lds

/ 0.4

0

10

20

30

40

50

0.5 1 1.50

5

10

15

20

25

30

35

-1 -0.5 0 0.5 1


BELLE Belle: B → K∗l+l− — F-B asymmetry386

fb−1

BELLE-CONF-0521

-40

-20

0

20

40

-40 -20 0 20 40A9/A7

A10

/A7

(a) negative A7

-40

-20

0

20

40

-40 -20 0 20 40A9/A7

A10

/A7

(b) positive A7

A9/A7 = −15.3+3.4−4.8 ± 1.1 A9/A7 = −16.3+3.7

−5.7 ± 1.4

A10/A7 = 10.3+5.2−3.8 ± 1.8 A10/A7 = 11.1+6.0

−3.9 ± 2.4


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Tim Gershon - Welcome to the University of Warwick · 2006-02-20 · Mbc (GeV/c 2) Entries/2MeV/c 2...

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