More about excited bottomonium radiative decays

TL;DR

This paper revisits bottomonium radiative decays, emphasizing higher-order relativistic effects, especially the leading correction to the magnetic spin-flip operator, which aligns lattice results with experimental data.

Contribution

It identifies the significance of the leading relativistic correction to the magnetic spin-flip operator and incorporates O(v^6) effects to improve lattice decay predictions.

Findings

Relativistic corrections are crucial for accurate decay predictions.

Inclusion of O(v^6) effects aligns lattice results with experiments.

Leading correction to the magnetic spin-flip operator is particularly important.

Abstract

Radiative decays of bottomonium are revisited, focusing on contributions from higher-order relativistic effects. The leading relativistic correction to the magnetic spin-flip operator at the photon vertex is found to be particularly important. The combination of O(v^6) effects in the nonrelativistic QCD action and in the transition operator moves previous lattice results for excited Upsilon decays into agreement with experiment.