Heavy hybrid decays to quarkonia

TL;DR

This paper calculates semi-inclusive decay rates of heavy quarkonium hybrids into conventional quarkonia using nonrelativistic effective field theories, providing updated theoretical predictions compared with experimental data.

Contribution

It extends previous calculations by including leading and subleading power corrections, offering refined decay rate predictions for heavy quarkonium hybrids.

Findings

Predicted decay rates align with experimental data for hybrid candidates.

Updated calculations improve understanding of hybrid decay mechanisms.

Provides a theoretical framework for identifying heavy quarkonium hybrids.

Abstract

The decay rates of the XYZ exotics discovered in the heavy quarkonium sector are crucial observables for identifying the nature of these states. Based on the framework of nonrelativistic effective field theories, we calculate the rates of semi-inclusive decays of heavy quarkonium hybrids into conventional heavy quarkonia. We compute them at leading and subleading power in the inverse of the heavy-quark mass, extending and updating previous results. We compare our predictions with experimental data of inclusive decay rates for candidates of heavy quarkonium hybrids.