# Radiative decays in bottomonium beyond the long wave length approximation

## TL;DR

This paper improves the theoretical modeling of electromagnetic radiative decays in bottomonium by incorporating experimental mass and energy data, extending beyond the long wavelength approximation for more accurate predictions.

## Contribution

It introduces a new method to implement experimental energy dependencies in bottomonium radiative decay calculations beyond the long wavelength approximation.

## Key findings

- Calculated decay widths agree well with experimental data.
- The new method extends the applicability of models to higher energy transitions.
- Proper inclusion of experimental masses improves theoretical predictions.

## Abstract

We revisit the nonrelativistic quark model description of electromagnetic radiative decays in bottomonium. We show that even for the simplest spectroscopic quark model the calculated widths can be in good agreement with data once the experimental masses of bottomonium states and the photon energy are properly implemented in the calculation. For transitions involving the lower lying spectral states this implementation can be easily done via the Long Wave Length approximation. For transitions where this approximation does not apply we develop a new method of implementing the experimental energy dependencies.