$T_{cc}$ pole trajectory

TL;DR

This study explores the spectrum of the doubly charmed tetraquark $T_{cc}$ using lattice QCD techniques, including various operators and quark mass variations, to understand its properties.

Contribution

First lattice QCD analysis of $T_{cc}$ spectrum incorporating diquark-antidiquark and molecular operators with multiple quark mass settings.

Findings

Inclusion of diquark-antidiquark and molecular operators improves spectrum analysis.

Use of modified L"uschers method addresses non-analyticities near the Left Hand Cut.

Results provide insights into the structure and spectrum of $T_{cc}$ tetraquark.

Abstract

We investigate the spectrum of doubly charmed tetraquark $T_{cc}$ with quantum number $I(J^P) = 0(1^+)$ using MILC's $N_f = 2+1+1$ HISQ gauge ensembles at two lattice spacings. We have included diquark-antidiquark operator together with molecular and scattering operators in our analysis and varied both the heavy and light quark masses. We employ the anisotropic Clover action for heavy quarks, and $O(a)$-improved Wilson--Clover action for the light (up/down) quarks. In order to handle the non-analyticity near the Left Hand Cut we use modified L\"uschers method when close to it.