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Unique New Physics Search at Belle II

Unique New Physics Search at Belle II. Paoti Chang National Taiwan University. arXiv: 1002.5012. Select a few channels that BelleII/SuperB can probe new physics better than LHC. Adrian will highlight the strength of SuperB New ideas, comments and suggestions are welcome.

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Unique New Physics Search at Belle II

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  1. Unique New Physics Search at BelleII Paoti Chang National Taiwan University NP in BelleII

  2. arXiv: 1002.5012 NP in BelleII

  3. Select a few channels that BelleII/SuperB can probe new physics better than LHC. • Adrian will highlight the strength of SuperB • New ideas, comments and suggestions are welcome. • Slides are selected from the talk slides given by Bostjan Golob at BPAC meeting. NP in BelleII

  4. Charged Higgs on B →t n BsigBtag (tn)(Xln) (Ynn)(Xln) ECL: new electronics background reduction Nsig=154 ± 36 signal Belle 50 ab-1: semil. + hadr. tag; main syst. reducible: bkg. ECL shape, e Btag Vub ±3%,fB ±3% NP in BelleII

  5. Similar study for B→D(*)tn • B →mn: 4.3 ab-1 for 5sdiscovery (SM Br); Charged Higgs Search 5 s discovery sensitivity Atlas Belle II, 5 ab-1 Belle II, 50 ab-1 tan b excluded currently (Br(Btn)) @ 95.5% 5s discovery, Belle II, 5 ab-1 5s discovery, Belle II, 50 ab-1 mH+ [GeV] Belle II Br(Btn)) sensitive to H+ at large mH+ and tan b at low tan b B  Xsg constraints the parameters Belle II reach @ L can be parametrized: tan b 5 ·(0.5 ab-1/L) ·[1·10-4GeV-2· (m - 90 GeV)2 + 12.2] NP in BelleII

  6. MSSM searches Belle II mass insertion approximation, example of flavor observables A.G. Akeroyd et al., KEK Report 2009-12 excluded by B Xsg S(KSp0g) low tanb DSf DSf=sin2f1(ccs) – sin2f1(sss) two points in (DSf, S(KSp0g)) DSf= [-0.3,-0.2] S(KSp0g) ~ -0.4 DSf= [0,0.1] S(KSp0g) ~ 0.1 NP in BelleII

  7. Search for Right-Handed Neutral Currents Belle II DSSD Belle II PXD Belle DSSD t-dependent CPV in KSp0g (S(KSp0g)) B decay vtx from Ks and IP; vertex detector: e(KSp+p-), s(t) A.G. Akeroyd et al., KEK Report 2009-12 sBelle Design Group, KEK Report 2008-7 s(SCP(Ksp0g))= 0.09 @ 5 ab-1 0.03 @ 50 ab-1 6th layer at r=13 cm 6th layer at r=14 cm 6th layer at r=15 cm 5 ab-1 50 ab-1 s(DS(Ksf))= 0.10 @ 5 ab-1 0.05 @ 50 ab-1 worse e worse sz NP in BelleII

  8. MSSM searches Belle II Example points: shown with expected accuracy @ 5 ab-1 DSf= [-0.3,-0.2] S(KSp0g) ~ -0.4 DSf= [0,0.1] S(KSp0g) ~ 0.1 Belle II can distinguish various SUSY models A.G. Akeroyd et al., KEK Report 2009-12 NP in BelleII

  9. Search for New CP Phase t s K • : • Tree+penguin processes,B →Kp • DAKp= A(K+p-)- A(K+p0)= -0.147±0.028 • model independent sum rule: • A(K0p+)=0.009 ±0.025 • A(K+p0)=0.050 ±0.025 • A(K+p-)=-0.098 ±0.012 • A(K0p0)=-0.01 ±0.10 g b W u B u d p d HFAG, LP’09 penguin dominated A(K0p0) dA(K+p0) M. Gronau, PLB627, 82 (2005); D. Atwood, A. Soni, PRD58, 036005 (1998) measured (HFAG) A(K0p+) sum rule expected (sum rule) Belle II 50 ab-1 HFAG, LP’09 NP in BelleII

  10. Tree+penguin processes,B0 →Kpp0 K*p, Kr: T+PEW/PQCD larger than in Kp similar as in Kp: isospin sum rule M. Gronau, D. Pirjol, J. Zupan, arXiv:1001.0702 • B0Kpp0: A(K*+p- ) & A(K*0p0) should destructively interfere. : : : : : • Large Acp on B0K*+p-, r- K+ andB0K*+p0, r0K+ • Check three Acp sum rules: K*p , rK and Kp NP in BelleII

  11. Search for LFV in t decays t →lg, t→ l h, t→ l -t →lg : bkg from ee→ ttg (U.L.  1/L) - t→ l h, t→ lll : bgk free (U.L.  1/L) example: Higgs mediated LFV, t→ mh with 10 ab-1 constraints on tanb improved by 30 - 40% for all mA identification of specific models sensitivity 10-9 and 7x10-9 @ 50 ab-1 Belle, 10 ab-1 little Higgs T parity MSSM NP in BelleII

  12. Other Topics and Summary • B → K* nn,Charm mixing, AFB(ee→mm) ... •  Adrian’s talk • Possible polarized beam and run at charm threshold for SuperB. • NP search: Btn, right-handed neutral currents, • Acp(K(*)p)/A(rK) sum rule tests, • LFV in t decays NP in BelleII

  13. Physics on Super B Factory, 1 NP in BelleII

  14. Physics at Super B Factory, 2 NP in BelleII

  15. Physics on Super B Factory, 3 NP in BelleII

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