A theoretical investigation on tetra-quark states in the context of composite fermion model of diquark

Abstract

Abstract The masses of the tetra-quark states ( q q q ¯ q ¯ ) have been investigated in the framework of diquark [qq] anti-diquark [ q ¯ q ¯ ] configuration where the diquarks (anti-diquarks) are described by the Composite Fermion Model. The tetra-quark masses of several particles such as f 0(1370), K (1460), D (2632), Y (4143), Zc (4430) and Tcc (3797) have been investigated. The higher state masses of these have also been studied using Mass Loaded Flux Tube Model. Their Regge trajectories for different angular momenta have been drawn indicating their masses at L=0. These estimated masses for L=0 compare favorably with their experimental ground state masses. The corresponding string tensions are estimated. The slope of the Regge Trajectories (RT) are extracted and it is observed that RT slope shows a non-linear behavior.