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Dimuon CP asymmetry and new physics in Bs-Bsbar mixing

Dimuon CP asymmetry and new physics in Bs-Bsbar mixing. Seungwon Baek (Korea U) LHC Workshop, Konkuk U. Aug 11, 2010 Work in progress with A. Alok, D. London. Outline. Introduction D0 anomaly and NP in Bs-Bsbar mixing Non-universal Z’ model Flavor changing Z model with vector-like b’

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Dimuon CP asymmetry and new physics in Bs-Bsbar mixing

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  1. Dimuon CP asymmetry and new physics in Bs-Bsbar mixing Seungwon Baek (Korea U) LHC Workshop, Konkuk U. Aug 11, 2010 Work in progress with A. Alok, D. London

  2. Outline • Introduction • D0 anomaly and NP in Bs-Bsbar mixing • Non-universal Z’ model • Flavor changing Z model with vector-like b’ • Conclusions

  3. B physics in the LHC era • The SM CKM paradigm has been strongly reinforced in B, D, and K decays. • Several rare decays sensitive to NP also support the SM: ΔMd, ΔMs, B→Xsγ, εK, … • However, ν-oscillations, evidence for DM, the hierarchy problem of the SM suggests NP, hopefully at TeV scale

  4. Lunghi, Soni (2009) sin2β measurements involving b→s penguins are ~2σ different from S(B→J/ψ KS).

  5. ● ● Forward-backward asymmetry in http://www.kek.jp/intra-e/press/2009/BellePress14e.html

  6. deviates from the SM by 2.2σ ● HFAG (2008)

  7. All these deviations are in b→s transitions • These will be much more precisely measured at LHCb • Bs→μ+μ- • .

  8. Bs-Bsbar mixing • Mass eigenstates: • Time evolution: • Mass and width difference:

  9. D0 like-sign charge asymmetry • With 6.1 fb-1 data, D0 measured • Wrong sign charge asymmetry : 2.5σ difference

  10. If NP only in M12s, • then, imposing from , • NP in can solve the problem ! ???

  11. With NP in the decay … • No more

  12. Mixing induced CPA in B-decay • Indirect CPA • Exp • SM

  13. Non-universal Z’ model • Tree-level FCNC • M12Γ12

  14. M12 • Γ12 • Γ12(Z’): considered c, τ-loop only, can compete with the SM when

  15. L couplings only • After imposing constraints

  16. Flavor changing Z with VL b’ • Introduce vector-like isosinglet b’ • 4x4 down-quark mass matrix • 3x4 “CKM” matrix V • U≡V†V≠1 → Z-mediated FCNC at tree-level

  17. Conclusions • Explained semileptonic charge asymmetry as well as , • In non-universal Z´-model, all the three observables can be accommodated with non-standard operators • In FC Z-model with VL b´, large , marginal but cannot explain 1σ of

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