Comment on nonperturbative effects in $B\to X_sγ$

Details Comment on nonperturbative effects in $B\to X_sγ$ Comment on nonperturbative effects in $B\to X_sγ$

1997-02-12

arxiv.org/abs/hep-ph/9702322v2

Phys.Lett.B402:178-182,1997

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages revtex, 2 figures included; minor changes, to appear in Phys. Lett. B

Scientific paper

10.1016/S0370-2693(97)00304-3

Uncertainties in the theoretical prediction for the inclusive $B\to X_s\gamma$ decay rate are discussed. We emphasize that there is no operator product expansion for this process. Nonetheless, some nonperturbative effects involving a virtual $c\bar c$ loop are calculable using the operator product expansion. They give a contribution to the decay rate that involves the B meson matrix element of an infinite tower of operators. The higher dimension operators give effects that are only suppressed by powers of $m_b\Lambda_{QCD}/m_c^2 \sim 0.6$, but come with small coefficients.

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