Regular Article - Theoretical Physics
Revisiting radiative decays of heavy quarkonia in the covariant light-front approach
C. N. Yang Institute for Theoretical Physics, Stony Brook University, Stony Brook, NY, 11794, USA
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Accepted: 7 April 2017
Published online: 19 April 2017
We revisit the calculation of the width for the radiative decay of a heavy meson via the channel in the covariant light-front quark model. We carry out the reduction of the light-front amplitude in the non-relativistic limit, explicitly computing the leading and next-to-leading order relativistic corrections. This shows the consistency of the light-front approach with the non-relativistic formula for this electric dipole transition. Furthermore, the theoretical uncertainty in the predicted width is studied as a function of the inputs for the heavy-quark mass and wave function structure parameter. We analyze the specific decays and . We compare our results with experimental data and with other theoretical predictions from calculations based on non-relativistic models and their extensions to include relativistic effects, finding reasonable agreement.
© The Author(s), 2017