Abstract
Tcc is a very near-threshold state (below the D⁎+D0 threshold about 273 keV). Its long-distance structure is of the significance. In the molecular scheme, we relate the coupling constants of Tcc with D⁎+D0 and D⁎0D+ to its binding energy and mixing angle of two components with a coupled-channel effective field theory without cutoff-dependence and prior isospin assignment. We investigate the kinetically allowed strong decays Tcc→D0D0π+, Tcc→D+D0π0 and radiative decays Tcc→D+D0γ and show that the decay width of Tcc→D0D0π+ is the largest one, which is just the experimental observation channel. Our results show that the decay width obtained in the first analysis from LHCb collaboration in Breit-Wigner distribution is over-estimated. Our results were supported by the following experimental analysis from LHCb within unitarized Breit-Wigner formalism.
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