https://doi.org/10.1140/epjc/s10052-017-4818-5
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
* e-mail: yanliang.shi@stonybrook.edu
Received:
10
March
2017
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
