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      Evidence for an Excess of\(\overline{B}\to {D}^{(*)}{\tau }^{-}{\overline{\nu }}_{\tau }\)Decays

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      Physical Review Letters
      American Physical Society (APS)
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          Review of Particle Physics

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            Estimate of\(\mathcal{B}(\overline{B}\to {X}_{s}\gamma )\)at\(O({\alpha }_{s}^{2})\)

            Combining our results for various O(alpha[s]) corrections to the weak radiative B-meson decay, we are able to present the first estimate of the branching ratio at the next-to-next-to-leading order in QCD. We find B(B[over ]-->X[s]gamma)=(3.15+/-0.23) x 10(-4) for Egamma>1.6 GeV in the B[over ]-meson rest frame. The four types of uncertainties:nonperturbative (5%), parametric (3%), higher-order (3%), and m(c)-interpolation ambiguity (3%) have been added in quadrature to obtain the total error.
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              The BABAR detector

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                Author and article information

                Journal
                PRLTAO
                Physical Review Letters
                Phys. Rev. Lett.
                American Physical Society (APS)
                0031-9007
                1079-7114
                September 2012
                September 6 2012
                : 109
                : 10
                Article
                10.1103/PhysRevLett.109.101802
                e4cdb8ee-bfd0-4629-a6a9-0d00ff4532d5
                © 2012

                http://link.aps.org/licenses/aps-default-license

                http://link.aps.org/licenses/aps-default-accepted-manuscript-license

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