B(s) --> eta, eta' and D(s) --> eta, eta' transitions from QCD light-cone sum rules

por Blazenka Melic (Boskovic Institute, Zagreb)

jueves 17 dic. 2015 12:00 → 13:00 Europe/Madrid

Seminar Room, 1.1.1 (IFIC)

In the framework of the QCD light-cone sum rules (LCSRs) we present the thorough analysis of B(s) --> eta, eta' and D(s) --> eta,eta' form factors (f_+,f_0,f_T) needed for predictions of nonleptonic and semileptonic B(s) and D(s) decays in eta and eta' mesons. The analysis is done beyond the leading order in QCD by including consistently efects of higher twists and two-gluon contributions in eta and eta' into account. The SU(3)-flavour breaking corrections and the axial anomaly contributions to the distribution amplitudes are also considered. The obtained results for the form factors are used to predict semileptonic  D(s) and B(s) --> eta(') e nu, eta(') l l , eta(')  nu nu  decays.