collaboration

collaborationLCPAC 2006 Status Report

S.L. Olsen U. of Hawai’i

KEK B-factory

Highest possible grade2 consecutive years

Sekkyokuteki suishin“push aggressively”

Publications

• 164 journal papers published or submitted– All reporting important, high impact results

• ~42 papers submitted since LCPAC-2005

• ~9 currently in “authorship confirmation”

• …

Notable recent results

• Observation of bd• Evidence for BKK• Large direct CPV in B+K+0 decays• Observation of a FB asymm in BK*l+l-

• Observation of a c1’ candidate in DD• A new charmonium-like state, X(3940)• New csu baryons, cx(2980) and cx(3077)• …

Collaboration is stable

•Institutions:•Nat’l Kaohsiung Normal U.•Utkal University•Aomori University•Tsukuba University

•~30 individuals

•Institutions:•Illinois•Nova Gorica Inst, Slovenia

•~40 individuals

Withdrawals: New members:

Spokesperson changes

Aihara Olsen Yamauchi

Iijima Browder

Yamauchi

ふにきがいれ , ぉにがそと

New spokespersons all ran on platforms promising major

reorganization of Belle

elle continues to perform very well

SVD-2 team continue their heroics

Belle’s long march

SVD2

SVD performance

A.Kibayashi

4 layers + improved coverage better tracking effic

October Meltdown!!

Quick fix

Solder wires directlyto the repeater board

Beam off: 10/20

Resume Data taking 11/4

(connector establishedoutside the detector

during this past month)

more details from Uno-san

SVD Occupancy

Present : layer 1 of SVD

~10% occupancy / 200 Krad.yr-1

L~1.6x1034 → L~5x1034 cm-2s-1 ???

~10% ~4%

~2% ~2%SVD2

Need to upgrade the inner layers: SVD2.5

Tracking continues to improve

0.3%

Pt resolution ( in %)

(B: 21MeV)

New “Global” track finder

Standard track finder

Tracking effic.improvements:+7% for J/y KS; +60% for D*+D*-

3xBkg

…as does0 detection

M(0) resolution ( in MeV)

4.5MeV

100MeV 1 GeV

(B: 8MeV)

0 line shapeData vs MC

0 detection effic is sensitiveto bkg conditions; ECL reconcode.is being improved

~87%

~8% ACC dead tubes

Particle ID performance remains high

Last yr

w/o Event Builder

Upgrade

DAQ and computing are still keeping up

albeit just barely

Present operation

Faster signal processingwith CMS chip in SVD(Silcon vertex det.)

New pipelined dataAcquisition system (COPPER)

Plan to implement this on the CDC this summer

We have a new computing system

Katayama’s talk this afternoon

1200 Dell servers

The Belle Physics Program

1) Measure of Fundamental SM Params:

CKM elements & phases

2) Search for New Physics:

look for evidence of new particles in loops

3) Unanticipated new phenomena:

large (e+e-cccc), X(3872),X(3940),Y(3940),..

4) + lots of “bread & butter”

c’, c2’, D**,c*, cx,-physics, spin frag-fcn,…

I can only give a few small tastes from this rich & flavorful menu

BB00 J/ J/ K K00 sin21= 0.652 ±0.039 (stat) ±0.020 (syst) A = 0.010 ±0.026 (stat) ±0.036 (syst)

B0 tag_

B0 tag

Precis

ion measu

rement

well underst

ood meth

od

E-Mbc 2D fits to individual time intervals

B0 tagged B0 tagged

t (ps)

+−

AC

P

+−

Yie

ld2005 results: Bkg subtracted B+ - projections

06.016.067.0

06.012.056.0

S

A

4signal for Direct CPV

& 18071 2

190 2

2005: Status of B+ -

Belle 275M

BABAR 227M

A

~2.3 difference between Belle and BABAR

S

S

- A(C)

275M BBbar pairs

62.04.03.05.0

00 10)3.2()( Br

17.044.0)( 53.052.0

00 CPA

Chao, Chang et al,

PRL 94 181803

Belle’s measurement of ACP(B0 0 )

CPV in B0 +

B VV: not a single CP eigenstate + +0: wide resonance, two 0’s in the final state.

B(00) << B(+), B(+0) < 1.1 30 6 (26 6 ) x 10-6 (HFAG Winter05)

small Penguin pollution () 2A00

A+0

A+-/ 2

fL ~ 100% CP +1

Similar to B+, but in principle more complicated …

Three miracles:

B()NR and int. small

CPV in BCPV in B++--

)(08.0)(42.009.0

)()(30.000.0 10.009.0

syststatS

syststatA

Results:

Low quality tag

High quality tag

q=1 q=-1

(274 106 BB pairs)

No CPV φ2 is near 900

Somov, Schwartz et al hep-ex/0601024

Belle Constraints on Belle Constraints on 2 2 ((αα))

B [hep-ex/0502035] & combined

11375

93

2

12112

at 90% CL

3 () measurement

1

2

3

Vtd Vtb

Vcd Vcb

Vud Vub*

*

*

u

b

u

uc

sW

B+d

D0

Vcs

Vub

u

b

u

su

c

W

B+d D0

+Vus

Vcb _fCOMfCOM

Interference of bc and bu diagrams

Simple mixing CPV 3 (with Bd )+

Tree

3) 3)

Tree

Belle method for 3: Dalitz 3) fCOM = D KS

B+:

B-:

m+=m(Ks+), m=m(Ks) CPV: Asymmetry in Dalitz dist.:

r

r |A2|

|A1|r =

2m

2m

0 D 2m

2m

0 D obtainfromtagged D0

(D*+ D0+)sample

Poluektov, Bondar et al hep-ex/0504013

Constraints of the Unitarity Triangle

World average as of summer 2005

from GLW, ADS, Dalitz and sin(2φ1+φ3): γ/φ3=70 -14°+12

Simplistic(?) summation: 1+ 2+ 3 182o ~20o

CP angles only

1~20o

1~70o

sin21

1

?

Disfavored>2

Simplistic(?) summation: 1+ 2+ 3 182o ~20o

2-fold ambiguity21 -21

Ambiguity removed by Dalitz analysis of B0D0(Ks)h

Krokovny etal hep-ex/0507065

How about the CKM triangle’s sides?

1

2

3

Vtd Vtb

Vcd Vcb

Vud Vub*

*

*

md

& b d

b c l

b u ℓ-

ℓ

Belle Inclusive |Vub|Electron energy

at endpoint • Pth = 1.9 GeV/c

• Systematic limited

Hadronic and leptonic

invariant mass (Mx, q2) • Use full recon tag.• P+ also measured.

Non-experimental error dominated by errors of shape function parameters.

0.14 30.15(4.09 0.19 0.20 0.18) 10ubV

PDG 2002:(3.6 0.7) x 10-3

Limosani et al PLB 621, 28

Bizjak et al PRL 95, 141801

Bℓ Decay Search

Upper limits at EPS05

SM prediction

B search close to SM expectation

Measures fB|Vub|2

Ikado et al, hep-ex/0507034Results with 450 fb-1

expected next month

First Observation of bd

Addresses the same physics issue as Bs- Bs mixing (future Tevatron RunII goal).

_

signal

qq

K*other B

Mohapatra. Nakao, Nishida et al hep-ex/0506079

Current status

CPV angles only:η=0.321±0.027=0.193±0.57

sides only:η=0.342±0.022

=0.216±0.036

SM with KM ansatz works remarkably well for tree-level

processes

Next step: Look for new physics in penguin loops

Example: bsss

Example: no KM phase

SM: sin21 = sin21 from BJ/ KS (bc c s)

unless there are other, non-SM particles in the loop

eff

Vtd

Vtd

+

1

B B

, (’,

1

or’,

_

*

*

_

00

0

1"sin(2 )( )" 0.44 0.27 0.05B K

hep-ex/0507037

(180±16) (78±13)

Significant CP Violation in a bs penguin mode!!

Chen et al PRD 72012

>>all systematically below sin(2)

>>QCD corrections : sin2(penguin)>sin2(tree)

[Beneke, hep-ph/0505075][Cheng,Chua,Soni, hep-ph/0506268]

recent QCD factorization estimates :

sin2φ1(penguin)-sin2φ1(tree)

Many bs modes were studied:

sin21(penguin) = 0.50 0.06

(HFAG’s “naïve average”)

0.4-

AFB for B K*ℓ+ℓ-

(loops with virtual t’s, W’s, & Z’s)

new physics in

EW penguins? Interference btw and Z

AFB (Kℓ+ℓ -) = 0.09 0.14 (stat)AFB(K*ℓ+ℓ - ) = 0.56 0.13 (stat)3.4 from 0

Ishikawa et al hep-ex/0603018

Not just beauty

• Charm physics• Tau physics• Hadron spectroscopy

– Charmed mesons & baryons

– Charmonium states c’ , c1’

– Mystery states X(3872), X(3940), Y(3940)

• Fragmentation functions• Bs• Dark matter search

D0-D0 mixing

Shipsey @ DIF06

Belle 2006

Zhang, Li et al hep-ex/0601029

High precision -Fujikawa, Hayashii et al hep-ex/0502171

bonuses: new mesons, many puzzles!

c’X(3872)

Z(3931)c2’?

e+e-cccc Y(3940)J/

M(J/) MeV

??

Choi et al, PRL 89 112001Choi et al , PRL 91 262001

Choi et al , PRL 94 182002

Uehara et al , PRL 96 082003

Pakhlov et al , hep-ex/0507019

more bonuses: charmed baryons

D0’0(2427)

D0*(2308)

c+-

c0(2800

c+0

c+(2800

c++

c(2800

Kuzmin et alPR D69 112002

Mizuk et alPRL 94 122002

& mesons

(5S) “engineering” rundetails from Alan Schwartz this PM

CLEO PRL 54, 381

(5S)

(4S)

Bs(*)Bs(*)Bq(*)Bq(*)BqBq(*)πBqBqππ

100%BqBq

3-day, 1.86 fb-1 test run

Bf(Bs)< 0.56 x 10-4 (90%CL) ~factor 3 improvement on on world best limit

E M

bc Bs*Bs*

BsBs*

BsBs

Dark matter search

DAMA NaI 3Region

CDMS 04

CDMS 05

Direct dark-matter searches cannot see M<10 GeV region

McElrath, PRD 72, 103508:

Br((1S))~0.4% M < 4.7 GeV

Experimental signature:

(3S)s) nothing

Belle (with optimized trigger):

McElrath prediction

3fb-1 engineering run data@ the (3S) under analysis

Summary

CPV in B decays

BK*ℓ+ℓ- EW penguin

Direct CPV in BK

bd penguins(bd BKK)

|Vub| error <10%

B+

2 error~100

c’ & e+e-cccc

D0*0 & D1*0 mesons

X(3872)

c* baryon triplet

DD-mixing(world’s best limit)

X(3940), Y(3940)

c2’

3 error ~100 ??

Conclusion

• The Belle collaboration remains strong– Our publishing is nearing 1 paper/week– We have two new & energetic spokespersons

• Our detector continues to perform well– Continuously improvements to handle increased luminosity (&bkg)

• We have shown that the CKM ansatz works well for tree processes

– Verified with high precision– Provides “anchor point” for new physics searches

• CPV in penguins provide us with sensitive probe for new physics

– Theoretically and experimentally clean– We are measuring Bf~10-6 penguin processes with high precision

• We have made a number of “unexpected discoveries”– And expect many more in the future

Backup Slides

.“Observation” of Direct CP violation in BK- +

One more nail in the Superweak coffin.

Evidence for BK0 K (hadronic bd s s processes)

Belle@250 fb-1

_

Measurements of B K0 K0 CPV at Super B will be possible.