Super B Factories

1. Super B Factories • Some news about Super B Factories • Available physics studies for Super B Factories • Plan/proposals by SuperKEKB study group • Questions for discussions Masashi Hazumi (KEK)

2. Belle/KEKB Luminosity Milestone: 500 fb-1=0.5 ab-1 (Equivalent to > 500 million BB-pairs) - Current Total =546 fb-1 (as of Feb 6, 2006) Expect many new results by summer 2006 !

3. ξy ◊ ◊ ◊ ◊ ◊ Crab crossing: beginning of SuperB ! Crab crossing may increase the beam-beam parameter up to 0.19 ! K. Ohmi (Strong-weak simulation) Head-on (crab) (Strong-strong simulation) crossing angle 22 mrad Superconducting crab cavities are now being tested, will be installed in KEKB around March 2006.

4. 5 4 3 NBB (1010) 2 We are here. 1 NBB ~100  now ! in the LHC era SuperKEKB Luminosity Projection • 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 !

5. 2 GeV e+ injection 2 GeV e+ damping ring 4GeV e– 2x3km or 6km e– gun IP 5 GeV e+ SC Linac 4 GeV e– SC Linac e– dump 7GeV e+ transport lines for energy return A Linear SuperB Factory slide by A.Hoecker at CCSG symposium in Orsay, Jan.2006 • Recent workshop: http://www.lnf.infn.it/conference/superbf05/ ; publication: physics/0512235 • Promising new idea using synergy with ILC research P. Raimondi, WS Hawaii 2005 achieveL ~ 1036 cm–2s–1 through very small beam-spot size: (x,y) submicrons (ATF2-FF) (yields luminosity enhancement of >103 compared to original SLAC-Super-B design) Beam-beam “disruption” parameter achieve small transversal emittance in damping ring with short damping time (< 1.5ms) • Several design alternatives under examination SBF layout with one damping ring and superconducting linacs

6. Available physics studies • SuperKEKB: hep-ex/0406071 • SuperBaBar: hep-ph/0503261 • Additional SuperKEKB studies at the last CERN Flavor WS in Nov. 2005 • Plenary talk “Future prospects for B factories” by M. Hazumi • WG2 talk “Prospects for Measurements of b g sg, b g sll and b g ctn / tn at Super-B” by T. Iijima • Cf. Many other talks from Belle/BaBar on present results

7. Super B Physics Reach from SuperKEKB LoI B t 50ab-1 w/ improvement simple projection CPV (b g s) tlg tlp/h/h’ FCNC t3l w/ n tl Ks tBg/p CKM 10-9 10-8 10-7 10-6 10-5 Upper limit on Br

8. Radiative Decays • Inclusive Br(bsg) |C7|, SF for |Vub| • BK*g isospin asymmetry (D+-) sign of C7 • Mixing induced CPV • Direct CPV in BXsg • BXdg Summary by M.Nakao 1st Super-B workshop at Hawaii

9. K. Hara (KEK) M. Hazumi (KEK) fKs based on S.Khalil and E.Kou PRD67, 055009 (2003) and SuperKEKB LoI

10. CPV in b g s and SUSY breaking • Correlations are useful to differentiate new physics models Expected precision at 5ab-1 T.Goto, Y.Okada, Y.Shimizu,T.Shindou, M.Tanaka (2002, 2004) + SuperKEKB LoI

11. 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lg SUSY GUT relation Correlation to b g s DS0 implies lower bound on Br(tgmg) T.Goto, Y.Okada, Y.Shimizu,T.Shindou, M.Tanaka (2002, 2004) + SuperKEKB LoI

12. SUSY breaking at SuperKEKB TCPV in B -> K*g TCPV in B ->f Ks Direct asymmetry in b -> s g T.Goto, Y.Okada, Y.Shimizu,T.Shindou, M.Tanaka (2002, 2004) + SuperKEKB LoI

13. from slides by M. Endo at HL06 workshop, 2004 M. Yamaguchi at ICFP2005 Parity of new physics M. Endo, S. Mishima, M. Yamaguchi PLB609, 95 (2005) LL or LR RL or RR

14. R.Faccini Charged Higgs 2008 Approx… today 2HDM • Uncertain regions could be clarified by B-Factories • depends on all other SUSY parameters …

15. How to distinguish the m or At phase from the dd23 phase ? P. Ko, SuperBaBar physics book (hep-ph/0503261) p.400 (p.410 in printed version)

16. Plan/proposals by SuperKEKB study group • Update SuperKEKB sensitivities • This can be done locally. • Most likely after ICHEP2006 (can use present estimations for the time being) • Combined plots with model calculations, discovery potentials • Observables: a set of b g s observables, t LFV, b g ctn, tn • Benchmark models should include • EWBGEN-motivated SUSY with sizable effects in B decays (e.g. effective SUSY) • SUSY GUT (to demonstrate correlations b/w b g s and tgm) • Model(s) that (can) accommodate observed CKM hierarchy: e.g. SUSY + flavor symmetry • Models that (can) explain the number of generations ?: e.g. superstring-inspired ? • Extra dim. ? • Whatever else interesting • Synergy study 1 with LHCb: e.g. b g s observables from both exps. • Synergy study 2 with leptons (WG3): e.g. tgm and mg e • Synergy study 3 with high pt (WG1) • e.g. SUSY GUT, test of EWBGEN, narrowing down SUSY breaking scenarios, charged Higgs • More studies if time/manpower allows

17. Questions (for discussions) • How to show discovery potential ? • Some people want “energy/mass reach”, which is sometimes irrelevant for flavor physics (mass reach can be very high assuming a strong coupling) • Are models proposed in the previous slide reasonable ? • If so, is it possible for the theory community to come up with a reasonable set of benchmark models ? • What do we use for QCD engineering, QCDF, pQCD, anything else ? • Need to choose something as a standard tool • How can experimentalists access model calculations ? • SuperKEKB LoI: theorists provided a big table of outputs (observables as a function of input parameters) • Can we have “generators” that can be used by experimentalists ? • exp. gets more freedom • th. may get more citations • Better way ? • Additional observables that were not covered previously ? • e.g. B g Kp, B g VV triple-product correlations NOT included in SuperKEKB LoI

18. Backup Slides

19. LL RR LR RL G.L.Kane, P.Ko, Haibin Wang, C.Kolda, Jae-hyeon Park, Lian-Tao Wang, PRD70, 035015 (2004)

20. Mass reach in general is much higher than O(TeV). Caution ! This fig. does not take into account SUSY breakdown at large mass. Should be used only for illustration purpose. from Jae-hyeon Park