Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1995-06-02
Phys.Lett. B355 (1995) 318-324
Physics
High Energy Physics
High Energy Physics - Phenomenology
13 pages, revtex
Scientific paper
10.1016/0370-2693(95)00762-A
The moments of the photon spectrum in the inclusive $B\to X_s\,\gamma$ decay can be calculated to order $\alpha_s$ accuracy at present, without knowing the $\alpha_s$ corrections to the effective Hamiltonian. We discuss the standard model predictions, and how the moments of the photon spectrum are related to certain matrix elements of the heavy quark effective theory. The sensitivity of these moments to new physics is small, and they provide a model-independent determination of the $b$ quark pole mass (at order $\alpha_s$), or equivalently, the matrix elements $\bar\Lambda$ and $\lambda_1$ of the effective theory.
Kapustin A. A.
Ligeti Zoltan
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