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    block this user An-Ping Li

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    Beijing 100085, P.R.China

    THEORY OF RARE B DECAYS

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    We discuss some selected topics in rare B decays in the context of the standard model and compare theoretical estimates with available data. Salient features of the perturbative-QCD and power corrections in the decay rate for B ? Xs + ? are reviewed and this framework is used to determine the Cabibbo-Kobayashi-Maskawa (CKM) matrix element |Vts|, yielding |Vts | =0.033 0.007 from the present measurements of the electromagnetic penguins. We review estimates of the ratio RK ? ? ?(B ? K ? + ?)/?(B ? Xs + ?) in a number of theoretical models, which give a consistent account of this quantity. Issues bearing on the photon energy spectrum in B ? Xs + ? are also discussed. The CKM-suppressed decays B ? Xd + ?, B ? ? + ?, andB 0 ?(? 0,?)+? are reviewed with particular emphasis on the long-distance contributions in the exclusive decays. The impending interest in these decays in determining the parameters of the CKM matrix is emphasized. Finally, the semileptonic decays B ? Xs? + ? ? are also discussed in the context of the SM. 1 B(B ? Xs + ?) and B ? K ? + ? in the Standard Model and experiment and determination of |Vts| 1.1 Experimental status Electromagnetic penguins were first sighted on the B territory in 1993 by the CLEO collaboration through the exclusive decay B ? K ? + ? 1.Thisfeatwas followed by the daunting measurement of the inclusive decay B ? Xs + ? in 1994 by the same collaboration 2. The present CLEO measurements can be summarized as 3: B(B ? Xs + ?) = (2.32 0.57 0.35) 10 ?4, B(B ? K ? + ?) = (4.20.80.6) 10 ?5, (1) which yield an exclusive-to-inclusive ratio: RK ? ? ?(B ? K ? + ?) =(18.16.8) %. (2) ?(B ? Xs + ?) Very recently, the inclusive radiative decay has also been reported by the ALEPH collaboration with a (preliminary) branching ratio4: B(Hb ? Xs + ?)=(3.29 0.71 0.68) 10 ?4. (3) Since the ALEPH measurement is done at the Z 0 peak in the process Z 0 ? b b ? Hb + X ? (Xs + ?)+X, the branching ratio in (3) involves a different

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    Title : THEORY OF RARE B DECAYS
    Abstract : We discuss some selected topics in rare B decays in the context of the standard model and compare theoretical estimates with available data. Salient features of the perturbative-QCD and power corrections in the decay rate for B ? Xs + ? are reviewed and this framework is used to determine the Cabibbo-Kobayashi-Maskawa (CKM) matrix element |Vts|, yielding |Vts | =0.033 0.007 from the present measurements of the electromagnetic penguins. We review estimates of the ratio RK ? ? ?(B ? K ? + ?)/?(B ? Xs + ?) in a number of theoretical models, which give a consistent account of this quantity. Issues bearing on the photon energy spectrum in B ? Xs + ? are also discussed. The CKM-suppressed decays B ? Xd + ?, B ? ? + ?, andB 0 ?(? 0,?)+? are reviewed with particular emphasis on the long-distance contributions in the exclusive decays. The impending interest in these decays in determining the parameters of the CKM matrix is emphasized. Finally, the semileptonic decays B ? Xs? + ? ? are also discussed in the context of the SM. 1 B(B ? Xs + ?) and B ? K ? + ? in the Standard Model and experiment and determination of |Vts| 1.1 Experimental status Electromagnetic penguins were first sighted on the B territory in 1993 by the CLEO collaboration through the exclusive decay B ? K ? + ? 1.Thisfeatwas followed by the daunting measurement of the inclusive decay B ? Xs + ? in 1994 by the same collaboration 2. The present CLEO measurements can be summarized as 3: B(B ? Xs + ?) = (2.32 0.57 0.35) 10 ?4, B(B ? K ? + ?) = (4.20.80.6) 10 ?5, (1) which yield an exclusive-to-inclusive ratio: RK ? ? ?(B ? K ? + ?) =(18.16.8) %. (2) ?(B ? Xs + ?) Very recently, the inclusive radiative decay has also been reported by the ALEPH collaboration with a (preliminary) branching ratio4: B(Hb ? Xs + ?)=(3.29 0.71 0.68) 10 ?4. (3) Since the ALEPH measurement is done at the Z 0 peak in the process Z 0 ? b b ? Hb + X ? (Xs + ?)+X, the branching ratio in (3) involves a different
    Subject : unspecified
    Area : Mathematics
    Language : English
    Affiliations
    Url : http://preprints.cern.ch/archive/electronic/hep-ph/9709/9709507.pdf
    Doi : 10.1.1.68.5571

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    An-Ping's Peer Evaluation activity

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