1. SuperKEKB to search for new sources of flavor mixing and CP violation - Introduction - Introduction - Motivation for L=10 35-36 - Motivation for L=10 35-36 - 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 M.Yamauchi FPCP03, Paris June 2003

2. KEKB in near future

3. 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)

4. Triangle in the future 300fb -1 3000fb -1

5. 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

6. Comparison with a LHC experiment  (B  D  )/  (B  D  ) at B factory with 5,000 fb -1

7. 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.

8. 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)

9. 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 )

10. T.Goto et al., hep-ph/0211143 SUSY scenario vs. B decays (3) A CP (B  M S  ) vs. stop mass  A CP (B  M S  ) ~ 0.05 (3ab -1 )

11. KEKB upgrade strategy Present KEKB L=10 34 2002030405080706091011 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

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

13. Luminosity10 34 (now)10 35 5-10x10 35 Number of bunches12235018 Vertical beta at IP (mm)731~3* Beam-beam parameter0.05 0.07* 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) 2.62.5~2* HER current (A)0.94.18 LER current (A)1.59.420 Machine parameters * These parameters are under study.

14. 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

15.  / 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

16. 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.

17. Summary and Conclusions Next generation B factories with L=10 35-36 is useful for: –Precise test of KM scheme of CP violation –Search for new physics in B and  decays –Identify mechanism of SUSY breaking. Design of the accelerator and detector is going on at KEK and other places. LoI will be submitted by the end of this year.