Radiative decays of hadronic molecules: From confusion to inspiration

TL;DR

This paper reviews radiative decays of hadronic molecules, clarifying misconceptions and emphasizing the importance of scale hierarchy in their interpretation, supported by illustrative examples.

Contribution

It provides a systematic review of radiative decays of hadronic molecules, highlighting the role of scale hierarchy and addressing interpretative confusions in the literature.

Findings

Clarified differences between types of radiative decays

Highlighted the importance of scale hierarchy in analysis

Provided instructive examples illustrating key points

Abstract

Radiative decays of hadronic states provide an essential source of information that can facilitate deciphering their nature and properties. However, a lot of confusion concerning radiative decays of hadronic molecules and their interpretation can be found in the literature. In this paper, we briefly review several types of such decays and pinpoint similarities and essential differences between them. In particular, we emphasise the crucial role played by the hierarchy of the scales relevant to the studied system and the resulting necessity of employing an approach that considers them appropriately. We illustrate the situation with several instructive examples.