Two-Photon, Two-gluon and Radiative Decays of Heavy Flavoured Mesons

Abstract

Here we present the two-photon and two-gluon decay widths of the S-wave (${\eta }_{Q\in c,b}$) and P-wave (${\chi }_{Q\in c,bJ}$) charmonium and bottonium states and the radiative transition decay widths of $c\bar{c}$, $b\bar{b}$ and $c\bar{b}$ systems based on Coulomb plus power form of the inter-quark potential ($CP{P}_{\nu }$) with exponent $\nu$. The Schr$\ddot{o}$dinger 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 E1 and M1 radiative transitions. It is found that the quarkonia mass spectra and the E1 transition can be described by the same interquark model potential of the $CP{P}_{\nu }$ with $\nu =1.0$ for $c\bar{c}$ and $\nu =0.7$ for $b\bar{b}$ systems, while the M1 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 $\nu <1.0$.

27 Pages, 8 figures

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Cited by in corpus (10)

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• Magnetic properties of ground-state mesons
• Decay rates of charmonia within a quark-antiquark confining potentials
• $B_c$ meson spectroscopy motivated by general features of pNRQCD
• Decay rates and electromagnetic transitions of heavy quarkonia
• Purely leptonic decays of the ground charged vector mesons
• Tetraquark states in the bottom sector and the status of the $Y_b$(10890) state
• Bottomonium spectroscopy motivated by general features of pNRQCD
• Annihilation Rates of ${}^3{D}_2(2^{--})$ and ${}^3{D}_3(3^{--})$ Heavy Quarkonia