Can we understand the decay width of the Tcc+ state?

• DOI: 10.1016/j.physletb.2022.136897
• Publication Date: 2022-01-13T21:46:03Z
• Authors: Xi-Zhe Ling; Ming-Zhu Liu; Li-Sheng Geng; En Wang; Ju-Jun Xie
• Keywords: Isoscalar

Inspired by the recent discovery of a doubly charmed tetraquark state $T_{cc}^+$ LHCb Collaboration, we employ effective Lagrangian approach to investigate decay width $T_{cc}^{+}\to D^{+} D^{0}\pi^{0}/D^{0} D^{0}\pi^{+}$ and D^{0}D^{+}\gamma$ with assumption that $T_{cc}^{+}$ is an isoscalar $DD^{\ast}$ molecule. We show both $T_{cc}\to D D\pi$ DD\gamma$ modes contribute $T_{cc}$, former being dominant. The resulting total about $\Gamma=63$ keV smaller than experimental obtained from Breit-Wigner fit data, $\Gamma=410\pm 165\pm 43^{+18}_{-38}$ keV, while close number alternative unitary analysis, $\Gamma=48\pm 2^{+0}_{-14}$ which supports molecular nature $T_{cc}$.