The B -> Xs gamma Photon Spectrum
Abstract
The photon energy spectrum in inclusive weak radiative B -> Xs gamma decay is computed to order alphas2 beta0. This result is used to extract a value for the HQET parameter from the average <1-2Eγ/mB>, and a value of the parameter λ1 from <(1-2Eγ/mB)2>. An accurate measurement of <1-2Eγ/mB> can determine the size of the nonperturbative contributions to the Upsilon(1S) mass which cannot be absorbed into the b quark pole mass.
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