SuperKEKB to search for new sources of flavor mixing and CP violation

SuperKEKBSuperKEKBto search for new sources of flavor mixing and CP violationto search for new sources of flavor mixing and CP violation

- Introduction- Introduction - Motivation for L=10- Motivation for L=1035-3635-36

- Precise test of KM scheme of CP violation- Precise test of KM scheme of CP violation - - Search for new physics in Search for new physics in BB and and decaysdecays

- - Identification of SUSY breaking mechanism in Identification of SUSY breaking mechanism in BB decaysdecays - - Upgrade of KEKB and BelleUpgrade of KEKB and Belle

- - Summary and conclusionsSummary and conclusions

Daily int. lum.

580pb-1/day

Integrated luminosity

147 fb-1

sin21=0.719±0.074±0.035Xsee Xs

Xsll Xsec.c.

Mbc distr. after E cut

BelleJuly 2002

Achievement and the consequence

High Luminosity Time dep. CP meas. Inclusive bsll meas.

We, probably, know how toaccumulate >109 B decays.

Time dependent CP can be measured with verysmall systematic error.

FCNC decays can bemeasured inclusively.

Search for new sources of flavor mixing and CP violation.

Mission 1

Precision test of KM unitarity.

Mission 2

Mission 3

Search for new physics in B and decays.

Identify SUSY breaking mechanism.

Bread’nd butterfor B factories.

See quantum effect in penguin and box loop.

Very important if New physics = SUSY.

Mission of Super B Factory(ies)

KEKB in near futureKEKB in near future

Measurements of the KM Elements

Measurements of the Angles

TrianTrianggle in the futurele in the future

300fb-1 3000fb-1

Conclusion 1

Super B Factory is useful for the precision test of KM scheme.

CPV in penguin decays

Belle (July 2002)

ACP(KS)=0.73±0.64

ACP(’KS)=0.76±0.36

ACP(J/KS)=0.719±0.074

Expected errors in ACP’s

ACP(KS, ’KS) = ACP(J/KS)

In SM,

New phase in penguin loop may change this relation.

KEKB

PEPII

Next B factory

SUSY effect in B K*

A.Ali

m()2 distribution F/B asymmetry

SM

These measurements are excellent probe to search for SUSY.

Inclusive decay, bsll, is much less model dependent. An ee

B factory provides a unique opportunity to measure this by pseudo-

reconstruction technique.

SUSY models with various parameters

Charged Higgs in tree decay

BD(*)vsD

- Large BF of O(1)%- Uncertainty in form factor cancels in the ratio (BD)/(BD).- polarization is more sensitive to H±.

M.Tanaka

Comparison with a LHC experimentComparison with a LHC experiment

(BD)/(BD)at B factory with5,000 fb-1

Conclusion 2

Super B Factory is useful to search for new source of flavor mixing and CP violation.

SUSY is an asymmetric symmetry!?

Mass matrix : Yukawainteraction

Yukawainteraction

+ SUSY

SM sector SUSY sector

mass spectrumquark mixingCP

of SM particles

mass spectrumscalar quark mixingCP

of SUSY particles

SUSY : mSUGRA or SU(5) SUSY GUT or U(2) flavor symmetry or … ???

Flavor structure of SUSY must be studied.

T.Goto et al.,PRD:035009,02

(|Vub|/|Vcb|)= 0.02 (now)0.005(1ab-1)

3

10°(1ab-1)

mS will be measuredat Tevatron soon.

sin21

=0.082 (now)0.02 (1ab-1)

SUSY scenario vs. B decays (1)

SUSY scenario vs. B decays (2) T.Goto et al.,PRD:035009,02

md/mdSM

md

=0.489±0.008 ps-1

Estimated fromsin21, Vcb, Vub and3 using the unitarityrelation.

mdSM~5%

(3ab-1)

T.Goto et al.,hep-ph/0211143

SUSY scenario vs. B decays (3)

ACP(BMS) vs. stop mass

ACP(BMS) ~ 0.05 (3ab-1)

Conclusion 3

Super B Factory is useful to study the flavor structure of SUSY, and to identify the SUSY breaking mechanism.

The ee B factories are competitive!!

KEKB upgrade strategy

Present KEKB L=1034

2002 03 04 05 080706 09 10 11

L=2x1035

L~1036

∫Ldt =350fb-1ILER=1.5A

ILER=9.4A

ILER=20AConstraint: 8GeV x 3.5GeV wall plug pwr.<100MW crossing angle<30mrad

L=2x1034

ILER=1.5A

Crab crossing

One year shutdown to:install ante chamberincrease RFmodify IR

Increase RF

New vacuum chamber

KEKB luminosity is limited by photo-electron instability.

Antechamber in solenoidal magnetic field

Luminosity 1034 (now) 1035 5-10x1035

Number of bunches 1223 5018 5018

Vertical beta at IP (mm) 7 3 1~3*

Beam-beam parameter 0.05 0.05 0.07*

Bunch length (mm) 5.6 3 3~5*

Horizontal beta at IP (cm) 60 30 15*

Horizontal emittance (nm) 18 33 6~33*

Half crossing angle (mrad) 11 15 20*

Vertical beam size at IP (m) 2.6 2.5 ~2*

HER current (A) 0.9 4.1 8

LER current (A) 1.5 9.4 20

Machine parameters

* These parameters are under study.

Higher luminosity collider will lead to:

Higher background

Higher event rate

Require special features to the detector.

- low p identification s reconstruction eff.

- hermeticity “reconstruction”

Detector uDetector upgpgraderade

- radiation damage and occupancy in the vtx. detector

- fake hits in the EM calorimeter

- radiation problem in the tracker and KL detector

- higher rate trigger, DAQ and computing

/ KL detection 14/15 lyr. RPC+Fe

Tracking + dE/dx small cell + He/C2H5

CsI(Tl) 16X0

Aerogel Cherenkov counter + TOF counter

Si vtx. det. 3 lyr. DSSD

SC solenoid1.5T

8GeV e

3.5GeV e

Detector upgrade: an example

2 pixel lyrs. + 3 lyr. DSSD tile scintillator

pure CsI (endcap)

remove inner lyrs.

“TOP” + RICH

New readout and computing systems

What will haWhat will happppen nexten next

We have a series of workshops. The 5We have a series of workshops. The 5thth one will be on one will be on September 24-26, 2003 in Izu, Japan. September 24-26, 2003 in Izu, Japan.

LoI will be submitted to KEK/LCPAC/HEP community afLoI will be submitted to KEK/LCPAC/HEP community after the workshop.ter the workshop.

We will continue R&D for machine and detector.We will continue R&D for machine and detector.

PEP-II/BaBar – KEKB/Belle joint workshop is scheduled PEP-II/BaBar – KEKB/Belle joint workshop is scheduled on January 19-22, 2004 in Honolulu.on January 19-22, 2004 in Honolulu.

Summary and ConclusionsSummary and Conclusions

Next generation B factories with L=10Next generation B factories with L=1035-3635-36 is usef is useful for:ul for:– Precise test of KM scheme of CP violationPrecise test of KM scheme of CP violation– Search for new physics in B and t decaysSearch for new physics in B and t decays– Identify mechanism of SUSY breaking.Identify mechanism of SUSY breaking.

Design of the accelerator and detector is going oDesign of the accelerator and detector is going on at Belle.n at Belle.LoI will be submitted by the end of this year.LoI will be submitted by the end of this year.