2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/177555We present results for two-loop QCD corrections to the short distance coefficient that governs leptonic decay of Bc-meson. After brief discussion of the technics of asymptotic threshold expansion used to perform this calculation, we give comments on the numerical value of two-loop corrections and its impact on NRQCD description of Bc-meson bound state dynamics.12 pages, 1 figure, v2: typos in appendix corrected; v3: Mathematica ant text files with results attachedHigh Energy Physics - Phenomenologytext