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Future Prospects for B Physics at a Super B Factory

Future Prospects for B Physics at a Super B Factory. M. Hazumi M. Yamauchi T. Browder and many others. Thanks to:. Hitoshi Yamamoto Tohoku University DIF06, Frascati, March 2, 2006. Evidence for direct CP violation in B g K + p -. Observation of CP violation in B meson system.

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Future Prospects for B Physics at a Super B Factory

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  1. Future Prospects for B Physics at a Super B Factory M. Hazumi M. Yamauchi T. Browder and many others Thanks to: Hitoshi Yamamoto Tohoku University DIF06, Frascati, March 2, 2006

  2. Evidence for direct CP violation in B g K+p- Observation of CP violation in B meson system We have done quite well so far ... PEPII,KEK-B both exceeded design lum. ~0.8 ab-1total

  3. Main Aim of B-factories :To test the CKM mechanism of CPV CPV by the irreducible complex phases in quark-W coupling: V: CKM matrix Unitarity of V (Unitarity triangle) Measure the sides and angles in different modes

  4. Status of Unitarity Triangle (Normalized to the length of the bottom) Summer 2005 ‘Lines’ by sin2b, eK, Vub/Vcb. a, g, and Dms,d all cross at a single point! Striking confirmation of the CKM paradigm. A part of SM.

  5. Problems of Standard Model • Quadratic divergence of Higgs mass correction. • Indicates new physics in TeV scale. • SUSY? Little Higgs? • Pattern of CKM matrix is not explained. • Underlining mechanism by new physics implied. • Why 3 generations? • Cannot explain the matter excess of universe. • CKM not enough. Other source of CPV implied. • Does not have dark matter candidates WMAP :~1/4 of universe is dark matter • Implies new particles (e.g. SUSY has).

  6. New Physics : New Flavor Structure • Standard Model quark-W coupling • Left-handed coupling only • Pattern of Cabibbo suppressions in CKM matrix • No additional CPV phases • New flavor structures • Could be right-handed • Pattern of mixing matrix element different from CKM • New CPV phases High-luminosity Flavor physics Mass matrix (general) Energy frontiers (LHC, ILC)

  7. For example : MSSM Down type squark mass matrix Super B factory

  8. Need for a Super B Factory • New flavor physics would be likely to appear in loops of b→s,d transitions. • B→s,d transitions currently limited by statistics. • Increasing the statistics by ~100 (thereby reducing the error by 1/10) is imperative. • → Super B-factory. • Preparations/studies underway in Japan, US, and Europe.

  9. Super KEK-B • Luminosity ~ 4×1035/cm2s • 40×KEKB design luminosity (25×achieved peak) • 5×109 BB pairs/yr • 4×109tt pairs/yr, 5×109 cc pairs/yr A super B factory is a super tau-charm factory • LOI in 2004 • http://belle.kek.jp/superb/loi • “Physics at Super B Factory” hep-ex/0406071 • Official Budget request submitted to Japanese government in Aug 2005. (Not approved yet)

  10. SuperKEKB 41035 cm-2s-1

  11. In order to increase the luminosity. . .

  12. Super KEK-B Upgrades Interaction Region Crab crossing q=30mrad. by*=3mm New QCS New Beam pipe More RF power Damping ring Linac upgrade

  13. Probes for New Flavor Structure • New CPV phase in b→sqq Time-dependent CPV analsysis (tCPV) • Right-handed current in b→sg tCPV • Lepton AFB in b→sll • LFV in t decays • Charged Higgs in B→ Dtn, tn • ...and many more (b→snn, mm, nn, gg ....)

  14. Time-dependent decay distribution on Y4S H. Miyake A S A = -C S: Dt±asymmetry, A: tag area difference

  15. Current status of b→sqq S= -xfsin2f1for J/YKS,L (xf : CP eigenvalue) Define sin2f1eff= -xfS D sin2f1eff = sin2f1eff -sin2f1

  16. DSfK0(July 2005) DSfK0(SuperKEKB) SM predictions bsqq at Super B Factory summer 2005 50ab-1 assuming present WA ∆S(fKs) at 50ab-1 = XX 0.03(stat)  0.01(syst) 0.04(th)

  17. fKs How can it constrain theories? Summer 2005 Mass matrix elements between and are constrained. based on S.Khalil and E.Kou PRD67, 055009 (2003) and SuperKEKB LoI

  18. fKs Theory may need some mechanism to explain suppressed d or f

  19. Right-handed current in bsg • In SM, s is left-handed → g is left-handed. In the CP conjugate mode, g is right-handed. Flavor-specific →no tCPV. (suppression factor ~ms/mb) • In BSM, s may be right handed. → tCPV LRSM, SUSY, Randall-Sundrum, etc. * LRSM: SU(2)LSU(2)RU(1) S~0.5 is allowed s b g X X

  20. tCPV in B→ Ksp0g Belle (386M BB pairs) : use Ks vertex for Dt S = 0.08±0.41±0.10 (MX<1.8 GeV) consistent with zero SM : S = -2 ms/mb sin2f1 ~ 0

  21. CPV in b g s and SUSY models (Super B) S[(Ksp0)K*g] error = 0.5(now) → 0.14(5ab-1) • Correlations are useful to differentiate new physics models T.Goto, Y.Okada, Y.Shimizu,T.Shindou, M.Tanaka (2002, 2004) + SuperKEKB LoI Expected precision at 5ab-1

  22. AFB(ll) in b→sll Polarization of ll system (or whatever is creating it) +L/R couplings to l → AFB(ll) l + l - b quark s quark ? sensitive to new physics : SUSY, heavy Higgs and extra dim. SM and SUSY models AFB SM also has large Asymmetry : Z-g interference S(ll) = q2

  23. AFB(ll) in b→sll : Sensitivities Sensitivity at Super KEKB Experimental results with 0.35 ab-1 Belle, 2005 Standard model MC, 50 ab-1 Zero-crossing q2 for AFB will be determined with 5% error. Belle, 2005 Control sample B→Kll Helicity(ll system) = 0 → No FB asymmetry.

  24. AFB(ll) in b→sll : now G(q2,cosq) : function of A7, A9, A10 These (radical) models are already excluded by recent data from Belle.

  25. BR(tgmg) ~10-6  tan2b ~ 1 TeV (mL2)32 mL2 ( ) 4 mSUSY ~ Search for LFV in t decays • SUSY + Seesaw, or GUT Large LFV possible Br(tmg)=O(10-7~9) mSUGRA

  26. Search for LFV in t decays Well within range! SUSY t→mg Present limit Super-B limit tlg tlp/h/h’ t3l tl Ks tBg/p Gaugino mass = 200GeV

  27. Br( tgmg) S(fKs) Br(b g sg) 50ab-1 A(b g sg) AFB(b g sll) S(K*g) S(fKs) A(b g sg) Br(b g sg) AFB(b g sll) More tests of SUSY breaking scenarios T.Goto, Y.Okada, Y.Shimizu,T.Shindou, M.Tanaka (2002, 2004) + SuperKEKB LoI

  28. Sensitivity for Charged Higgs Constraint from BXsg BDtn D(Form-factor) ~5% D(Form-factor) ~15% Btn (present) LHC 100fb-1

  29. Unitarity triangle at 50ab-1 It may not close. Something new in loops! Triangle closes, or...

  30. DNA Identification of BSMby Flavor Physics Unitarity triangle Rare decays ++: Large, +: sizable, -: small Okada et al (2004).

  31. Comparison with LHCb SuperKEKB 5ab-1 50ab-1 LHCb 2fb-1 CPV (b g s) FCNC w/ n CKM

  32. Vub Charged Higgs direct CPV f2(a) isospin analysis p+ p- Ks trajectory B vertex IP profile g g Advantages of Super B Factory • B decays with neutrinos BgDtn, tn, uln etc. • B decays with g, p0Bg Xsg, p0p0 etc. • B vertex reconstruction with Ks only ! BgKsp0, Ksp0g etc. Dtn etc. B meson beam ! B e- (8GeV) e+(3.5GeV) Υ(4S) p B full (0.1~0.3%) reconstruction BgDp etc.

  33. Summary • B-factories have been successful, and now beginning to probe new physics. • Many new physics are well within reach of Super B factory. • Super B factory can distinguish various BSM models. • New particles that would be discovered at LHC/ILC will be tested/measured in their flavor sector. • Super B factory is sensitive to mass scale beyond the reach of LHC/ILC.

  34. Back Ups

  35. ACP(B→Kπ) is equal between B± and B0. fL (B→VV) ~ 1 in SM tree B0 penguin B± Hint of Problems? Limited by statistics at the moment.

  36. Direct CP Violation

  37. 5 4 3 NBB (1010) 2 We are here. 1 NBB ~100  now ! in the LHC era Projection of integrated luminosity • Crab cavity installation in 2006 • ~2109 BB pairs by 2008 (4now) • Long shutdown (14months) in 2009-2010 • Constant improvement from 2010 • realistic and reliable plan based on experiences at KEKB • Crab cavities well tested before 2010: a big advantage !

  38. Bkg & TRG rate in future x20 Bkg x10 Bkg KEKB Bkg SVD CDC PID / ECL KLM Synchrotron radiation Beam-gas scattering (inc. intra-beam scattering) Radiative Bhabha

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