The B̄ → X s γ Photon Spectrum


The photon energy spectrum in inclusive weak radiative B̄ → Xsγ decay is computed to order αsβ0. This result is used to extract a value for the HQET parameter Λ̄ from the average 〈1 − 2Eγ/mB〉, and a value of the parameter λ1 from 〈(1 − 2Eγ/mB)〉. An accurate measurement of 〈1 − 2Eγ/mB〉 can determine the size of the nonperturbative contributions to the Υ(1S) mass which cannot be absorbed into the b quark pole mass.

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@inproceedings{Ligeti1999TheB, title={The B̄ → X s γ Photon Spectrum}, author={Zoltan Ligeti and Michael E. Luke and Aneesh V. Manohar and Mark B . Wise}, year={1999} }