Low-energy Scattering of $(D^{\ast }{\bar{D}}^{\ast }{)}^{\pm }$ System and the Resonance-like Structure $Z_c(4025)$

Abstract

In this paper, low-energy scattering of the $(D^{\ast }{\bar{D}}^{\ast }{)}^{\pm }$ meson system is studied within Lüscher's finite-size formalism using $N_f=2$ twisted mass gauge field configurations. With three different pion mass values, the $s$-wave threshold scattering parameters, namely the scattering length $a_0$ and the effective range $r_0$, are extracted in $J^P=1^{+}$ channel. Our results indicate that, in this particular channel, the interaction between the two vector charmed mesons is weakly repulsive in nature hence do not support the possibility of a shallow bound state for the two mesons, at least for the pion mass values being studied. This study provides some useful information on the nature of the newly discovered resonance-like structure $Z_c(4025)$ observed in various experiments.

Comments: 11 pages, 6 figures. arXiv admin note: substantial text overlap with arXiv:1403.1318