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New Physics in B decays

Explore the search for evidence of New Physics in B decays based on topological diagrammatic decomposition and CP asymmetry analysis post 3rd International Conference on Flavor Physics.

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New Physics in B decays

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  1. New Physics in B decays Tadashi Yoshikawa (Nagoya U. ) This talk is based on C.S.Kim, Y.J.Kwon,Jake Lee and T. Y. hep-ph/0509015 . 3rd International Conference on Flavor Physics Oct.3-8, 2005 National Central University, Taiwan

  2. Before LP05 • There were quite large discrepancies in CP asymmetries. After LP05

  3. After LP05 • The discrepancies were substantially reduced !! • Almost consistent with the SM !! Our task is to find the evidence of New Physics if they are cleverly hiding behind the SM.

  4. Where is the origin ? Using the topological diagrammatic decomposition: P : QCD Penguin, S: QCD Singlet Penguin C : color suppressed tree, PEW : EW penguin Ps, Ss, PEWs : bssspenguin processes

  5. Gronau, Hernandez, London, Rosner B decays b Ｔｒｅｅ QCDＰｅｎｇｕｉｎ Color suppressed tree ElectroWeak Penguin (PEW) Annihilation Color suppressed EWPenguin (PCEW) Singlet QCD Penguin

  6. Almost 0!! Af direct CP violation Sf mixing CP violation : fM (phase of B-B mixing)　～f１ fＤ(phase of A(Bf) ) Comparison by CP asymmetry Time-dependent CP asymmetry:

  7. New Physics window is still remaining !

  8. How to get ? • SＪ/y KVS bｓ　penguin processes • Among bｓ　penguins: SfK, Sh’ K, SKp • Between Bd decays and Bs decays • bｓ penguin VS bｄ　penguin processes. You can distinguish where the origin comes from!!

  9. For example

  10. Case B : B-1 ) The difference comes from the weak phase for C . Time-dependent CP asymmetry are To reduce both Sf s from sin2f1 ~ 0.69 is Slightly difficult because of the different of the sigh!!

  11. B-2 ) case B-1 + new weak phase . Lower bound of ShK under Ah’K = 0.08 0.07, AKp = 0.02  0.13 , SKp = 0.31 0.26 EXP. bound r > 0.1, q > 80 Need large r (~ C / P) !! Other hand , In SM, r ~ O(0.01)

  12. In Case D: SfK　～　 Sh’ K　 ～　SKp How to distinguish ? Consider using Bs decays !! We can get information because no phase in Bs mixing .

  13. s Bd decays + Bs decays S, d b S, d

  14. Pure EW penguin process ( if C is negligible ) Pure penguin process We will extract each information about New phase including each diagram.

  15. Bs fh’, Bs h’p, BsK0K0 will give us some very important information where the new CP phases come from. Conclusion • Time-dependent CP asymmetries may include some fruitful information about New Physics. • Comparing among Sf s, one may find the type of New Physics. • Several Bs decays may help resolve to distinguish the origin of New Physics!

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