QCD dynamics of tetraquark production

Stanley J. Brodsky, Richard F. Lebed
2015 Physical Review D  
We use the twist dimensions of the operators underlying the dynamical behavior of exclusive production processes as a tool for determining the structure of exotic heavy-quark states such as the $Z_c^+(4430)$ tetraquark. The resulting counting rules predict distinctive fall-offs of the cross sections in center-of-mass energy, thus distinguishing whether the tetraquarks are segregated into di-meson molecules, diquark-antidiquark pairs, or more democratically arranged four-quark states. In
more » ... states. In addition, we propose straightforward methods of experimentally producing additional exotic multiquark states.
doi:10.1103/physrevd.91.114025 fatcat:he2nd53lwjbwlcq4sivltiljsu