$T_{cc}^{+}(3875)$ relevant $D{D}^{\ast }$ scattering from $N_f=2$ lattice QCD

Abstract

The $S$-wave $D{D}^{\ast }$ scattering in the isospin $I=0,1$ channels is studied in $N_f=2$ lattice QCD at $m_{\pi }\approx 350$ MeV. It is observed that the $D{D}^{\ast }$ interaction is repulsive in the $I=1$ channel when the $D{D}^{\ast }$ energy is near the $D{D}^{\ast }$ threshold. In contrast, the $D{D}^{\ast }$ interaction in the $I=0$ channel is definitely attractive in a wide range of the $D{D}^{\ast }$ energy. This is consistent with the isospin assignment $I=0$ for $T_{cc}^{+}(3875)$. By analyzing the components of the $D{D}^{\ast }$ correlation functions, it turns out that the quark diagram responsible for the different properties of $I=0,1$ $D{D}^{\ast }$ interactions can be understood as the charged $\rho$ meson exchange effect. This observation provides direct information on the internal dynamics of $T_{cc}^{+}(3875)$.

arXiv comment12 pages, 14 figures, version to appear in Physics Letters B

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