2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/143988Recent developements in the calculation of the NNLO QCD corrections to the charm quark mass dependent matrix elements in B -> X_s gamma are reported. Special emphasis is put on the new results of the virtual O(alpha_s^2) fermionic contribution to these matrix elements [1].6 pages, 2 figures, to appear in the proceedings of the 8th International Symposium on Radiative Corrections RADCOR, October 1-5 2007, Florence, ItalyHigh Energy Physics - Phenomenologytext