SuperKEKB to search for new sources of flavor mixing and CP violation - Introduction - Introduction - Motivation for L= Motivation for L= Precise test of KM scheme of CP violation - Precise test of KM scheme of CP violation - Search for new physics in B and  decays - Search for new physics in B and  decays - Identification of SUSY breaking mechanism in B - Identification of SUSY breaking mechanism in B decays decays - Upgrade of KEKB and Belle - Upgrade of KEKB and Belle - Summary and conclusions - Summary and conclusions

Daily int. lum. 580pb -1 /day Integrated luminosity 147 fb -1 sin2  1 =0.719±0.074±0.035 XseeXsee XsXs XsllXsll X s e     c.c. M bc distr. after  E cut Belle July 2002 Achievement and the consequence High LuminosityTime dep. CP meas. Inclusive b  s ll meas. We, probably, know how to accumulate >10 9 B decays. Time dependent CP can be measured with very small systematic error. FCNC decays can be measured 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 butter for 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 future

Measurements of the KM Elements

Measurements of the Angles

Triangle in the future 300fb fb -1

Conclusion 1 Super B Factory is useful for the precision test of KM scheme.

CPV in penguin decays Belle (July 2002) A CP (  K S )=  0.73±0.64 A CP (  ’ K S )=  0.76±0.36 A CP (J/  K S )=  0.719±0.074 Expected errors in A CP ’s A CP (  K S,  ’K S ) = A CP (J/  K S ) 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, b  s ll, is much less model dependent. An e  e  B factory provides a unique opportunity to measure this by pseudo- reconstruction technique. SUSY models with various parameters

Charged Higgs in tree decay B  D (*)  vs  D    - Large BF of O(1)% - Uncertainty in form factor cancels in the ratio  (B  D  )/  (B  D  ). -  polarization is more sensitive to H ±. M.Tanaka

Comparison with a LHC experiment  (B  D  )/  (B  D  ) at B factory with 5,000 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 : Yukawa interaction Yukawa interaction + SUSY SM sectorSUSY sector  mass spectrum  quark mixing  CP of SM particles  mass spectrum  scalar quark mixing  CP 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  (|V ub |/|V cb |) = 0.02 (now)  0.005(1ab -1 )  3  10°(1ab -1 )  m S will be measured at Tevatron soon.  sin2  1 =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  m d /  m d SM  m d =0.489±0.008 ps -1 Estimated from sin2  1, V cb, V ub and  3 using the unitarity relation.  m d SM ~5% (3ab -1 )

T.Goto et al., hep-ph/ SUSY scenario vs. B decays (3) A CP (B  M S  ) vs. stop mass  A CP (B  M S  ) ~ 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 e  e  B factories are competitive!!

KEKB upgrade strategy Present KEKB L= L=2x10 35 L~10 36 ∫Ldt =350fb -1 I LER =1.5A I LER =9.4A I LER =20A Constraint:  8GeV x 3.5GeV  wall plug pwr.<100MW  crossing angle<30mrad L=2x10 34 I LER =1.5A Crab crossing One year shutdown to:  install ante chamber  increase RF  modify IR Increase RF

New vacuum chamber KEKB luminosity is limited by photo- electron instability. Antechamber in solenoidal magnetic field

Luminosity10 34 (now) x10 35 Number of bunches Vertical beta at IP (mm)731~3* Beam-beam parameter * Bunch length (mm)5.633~5* Horizontal beta at IP (cm)603015* Horizontal emittance (nm)18336~33* Half crossing angle (mrad)111520* Vertical beam size at IP (  m) ~2* HER current (A) LER current (A) 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 upgrade - radiation damage and occupancy in the vtx. detector - fake hits in the EM calorimeter - radiation problem in the tracker and K L  detector - higher rate trigger, DAQ and computing

 / K L detection 14/15 lyr. RPC+Fe Tracking + dE/dx small cell + He/C 2 H 5 CsI(Tl) 16X 0 Aerogel Cherenkov counter + TOF counter Si vtx. det. 3 lyr. DSSD SC solenoid 1.5T 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 happen next We have a series of workshops. The 5 th one will be on September 24-26, 2003 in Izu, Japan. LoI will be submitted to KEK/LCPAC/HEP community after the workshop. We will continue R&D for machine and detector. PEP-II/BaBar – KEKB/Belle joint workshop is scheduled on January 19-22, 2004 in Honolulu.

Summary and Conclusions Next generation B factories with L= is useful for: –Precise test of KM scheme of CP violation –Search for new physics in B and t decays –Identify mechanism of SUSY breaking. Design of the accelerator and detector is going on at Belle. LoI will be submitted by the end of this year.