3,161 research outputs found

    The Schreier refinement theorem for categories

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    Counting contact terms in B→VγB\to V\gamma decays

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    We clarify the origin and cancellation of contact terms in the weak annihilation amplitudes contributing to B→VγB\to V \gamma. It is demonstrated that the photon emission from the final-state quarks vanishes in the chiral limit of massless quarks. The contact terms in the QCD light-cone sum rule evaluation of the weak annihilation amplitudes are also discussed.Comment: 16 pages, 2 figures, Latex, ws-p8-50x6-00.cls, to be published in Sergei Matinian Festschrift ``From Integrable Models to Gauge Theories.'', Eds. V. Gurzadyan, A. Sedrakyan, World Scientific, 200

    Indirect search for supersymmetry in rare B decays

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    QCD corrections to the gluino induced contribution to b --> s gamma are shown to be important in order to extract reliable bounds on the off-diagonal elements of the squark mass matrices.Comment: 4 pages including 2 postscript figure
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