Eur. Phys. J. C (2007) 50: 801-808
https://doi.org/10.1140/epjc/s10052-007-0255-1

Regular Article - Theoretical Physics

Two-loop QCD corrections to the leptonic constant of the B_c-meson

¹ II. Institut für Theoretische Teilchenphysik, Universität Hamburg, 22761, Hamburg, Germany
² Institute for High Energy Physics, Protvino, Russia

^* e-mail: veretin@mail.desy.de

Received: 18 October 2006
Revised: 31 January 2007
Published online: 15 March 2007

Abstract

We present results for two-loop QCD corrections to the short-distance coefficient that governs leptonic decay of the B_c-meson. After a brief discussion of the technicalities of the asymptotic expansion used to perform this calculation, we give comments on the numerical values of the two-loop corrections and their impact on the NRQCD description of the B_c-meson bound state.