Some remarks on compositeness of $T^+_{cc}$

TL;DR

This paper investigates the nature of the exotic state $T^+_{cc}$ discovered by LHCb, analyzing whether it is a molecular state or has a tetraquark component, using various theoretical methods.

Contribution

The study applies two-channel K-matrix unitarization and Flatté-like parametrization to analyze $T^+_{cc}$, providing evidence for its molecular nature while acknowledging possible elementary contributions.

Findings

$T^+_{cc}$ is primarily a molecular state.

Analysis methods support the molecular interpretation.

Production rate analysis leaves room for elementary component.

Abstract

Recently LHCb experimental group find an exotic state $T^+_{cc}$ from the process $p\bar{p} \to D^0D^0\pi^+ + X$. A key question is if it is just a molecule or may have confined tetraquark ingredient. To investigate this, different methods are taken, including two channel ($D^{*+}D^0$ and $D^{*0}D^+$) K-matrix unitarization and single channel Flatt\'e-like parametrization method analysed by pole counting rule and spectral density function sum rule. It demonstrates that $T^+_{cc}$ is a molecular state, though the possibility that there may exist elementary ingredient can not be excluded, by rough analysis on its production rate.