The photon energy spectrum in B-> X_s + γin perturbative QCD through O(α_s^2)

Details The photon energy spectrum in B-> X_s + γin perturbative QCD through O(α_s^2) The photon energy spectrum in B-> X_s + γin perturbative QCD through O(α_s^2)

2005-05-12

arxiv.org/abs/hep-ph/0505097v2

Phys.Lett.B620:69-79,2005

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages, 6 figures; references added

Scientific paper

10.1016/j.physletb.2005.06.015

We derive the dominant part of the O(\alpha_s^2) correction to the photon energy spectrum in the inclusive decay B-> X_s+gamma. The detailed knowledge of the spectrum is important for relating the theoretical calculations of the B-> X_s + \gamma decay rate and the experimental measurements where a cut on the photon energy is applied. In addition, moments of the photon energy spectrum are used for the determination of the b-quark mass and other fundamental parameters of heavy quark physics. Our calculation reduces the theoretical uncertainty associated with uncalculated higher orders effects and shows that, for B-> X_s+\gamma, QCD radiative corrections to the photon energy spectrum are under theoretical control.

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