The B -> X_s gamma Photon Spectrum

Details The B -> X_s gamma Photon Spectrum The B -> X_s gamma Photon Spectrum

1999-03-10

arxiv.org/abs/hep-ph/9903305v1

Phys.Rev.D60:034019,1999

Physics

High Energy Physics

High Energy Physics - Phenomenology

16 pages, RevTeX

Scientific paper

10.1103/PhysRevD.60.034019

The photon energy spectrum in inclusive weak radiative B -> X_s gamma decay is computed to order alpha_s^2 beta_0. This result is used to extract a value for the HQET parameter $\bar\Lambda$ from the average <1-2E_\gamma/m_B>, and a value of the parameter $\lambda_1$ from <(1-2E_\gamma/m_B)^2>. An accurate measurement of <1-2E_\gamma/m_B> 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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