Low-energy Scattering of (DD̅^*)^± System And the Resonance-like Structure Z_c(3900) [article]

Ying Chen, Ming Gong, Yu-Hong Lei, Ning Li, Jian Liang, Chuan Liu, Hang Liu, Jin-Long Liu, Liuming Liu, Yong-Fu Liu, Yu-Bin Liu, Zhaofeng Liu, Jian-Ping Ma, Zhan-Lin Wang (+2 others)
2014 arXiv   pre-print
In this exploratory lattice study, low-energy scattering of the (DD̅^*)^± meson system is analyzed using lattice QCD with N_f=2 twisted mass fermion configurations with three pion mass values. The calculation is performed within single-channel Lüscher's finite-size formalism. The threshold scattering parameters, namely the scattering length a_0 and the effective range r_0, for the s-wave scattering in J^P=1^+ channel are extracted. For the cases in our study, the interaction between the two
more » ... med mesons is weakly repulsive. Our lattice results therefore do not support the possibility of a shallow bound state for the two mesons for the pion mass values we studied. This calculation provides some useful information on the nature of the newly discovered resonance-like structure Z_c(3900) by various experimental groups.
arXiv:1403.1318v2 fatcat:eqwtjnxy2fhkfgse4szsgcnuxy