NNLL QCD contribution of the electromagnetic dipole operator to Gamma(anti-B ---> X(s) gamma)

We present an independent calculation of that part of the O(\alpha_s^2) contribution to the decay width \Gamma(\bar B -> X_s \gamma) which arises from the self-interference term of the electromagnetic dipole operator O_7. Using a different method, we find complete agreement with a previous calcul...

Descripción completa

Detalles Bibliográficos
Autores principales: Asatrian, H.M., Hovhannisyan, A., Poghosyan, V., Ewerth, T., Greub, C., Hurth, T.
Lenguaje:eng
Publicado: 2006
Materias:
Particle Physics - Phenomenology
Acceso en línea:https://dx.doi.org/10.1016/j.nuclphysb.2006.05.026
http://cds.cern.ch/record/944800
Descripción
Sumario:We present an independent calculation of that part of the O(\alpha_s^2) contribution to the decay width \Gamma(\bar B -> X_s \gamma) which arises from the self-interference term of the electromagnetic dipole operator O_7. Using a different method, we find complete agreement with a previous calculation. This NNLL contribution is an important ingredient for the complete NNLL prediction of \Gamma(\bar B -> X_s \gamma) which will resolve the charm quark mass ambiguity appearing at NLL accuracy.

Ejemplares similares