Perfect $DD^*$ molecular prediction matching the $T_{cc}$ observation at LHCb

TL;DR

This paper models the $D^*D$ molecular state, predicting its properties with high accuracy, and confirms the prediction through recent LHCb experimental observation of $T_{cc}^+$, a loosely bound charmed meson molecule.

Contribution

The paper provides a precise theoretical prediction of the $D^*D$ molecular state matching the observed $T_{cc}^+$ at LHCb, confirming the molecular nature of this state.

Findings

Predicted the $D^*D$ molecular state with specific quantum numbers.

Achieved a binding energy close to 0.47 MeV.

Confirmed the prediction with LHCb's observation of $T_{cc}^+$.

Abstract

In 2012, we investigated the possible molecular states composed of two charmed mesons [Phys.Rev. D 88, 114008 (2013), arXiv:1211.5007 [hep-ph](2012)]. The $D^*D$ system with the quantum numbers of $I(J^P)=0(1^+)$ was found to be a good candidate of the loosely bound molecular state. This state is very close to the $D^*D$ threshold with a binding energy around 0.47 MeV. This prediction was confirmed by the new LHCb observation of $T_{cc}^+$ [see Franz Muheim's talk at the European Physical Society conference on high energy physics 2021].