Two-Loop Matrix Element of the Current-Current Operator in the Decay B -> X_s gamma

Details Two-Loop Matrix Element of the Current-Current Operator in the Decay B -> X_s gamma Two-Loop Matrix Element of the Current-Current Operator in the Decay B -> X_s gamma

2001-05-16

arxiv.org/abs/hep-ph/0105160v1

Nucl.Phys.B611:488-502,2001

Physics

High Energy Physics

High Energy Physics - Phenomenology

18 pages, 6 figures, 1 table

Scientific paper

10.1016/S0550-3213(01)00336-4

We evaluate the important two-loop matrix element of the operator (cbar gamma^mu P_L b) (sbar gamma_mu P_L b) contributing to the inclusive radiative decay B -> X_s gamma. The calculation is performed in the NDR scheme, by means of asymptotic expansions method. The result is given as a series in z = m_c^2/m_b^2 up to O(z^6). We confirm the result of Greub, Hurth and Wyler obtained by a different method up to 0(z^3). Higher-order terms are found to be numerically insignificant.