Two-photon, two-gluon and radiative decays of heavy flavoured mesons

Here we present the two-photon and two-gluon decay widths of the S-wave (eta(Q is an element of c,b)) and P-wave (chi(Q is an element of c,bJ)) charmonium and bottonium states and the radiative transition decay widths of c (c) over bar., b (b) over bar and c (b) over bar systems based on Coulomb plus power form of the inter-quark potential (CPP nu) with exponent v. The Schrodinger equation is solved numerically for different choices of the exponent nu. We employ the masses of different states and their radial wave functions obtained from the study to compute the two-photon and two-gluon decay widths and the El and MI radiative transitions. It is found that the quarkonia mass spectra and the El transition can be described by the same interquark model potential of the CPP nu with nu = 1.0 for c (c) over bar and nu = 0.7 for b (b) over bar systems, while the Ml transition (at which the spin of the system changes) and the decay rates in the annihilation channel of quarkonia are better estimated by a shallow potential with v < 1.0. (C) 2010 Elsevier B.V. All rights reserved.