The impact of quark many-body effects on exotic hadrons

Abstract We investigate the exotic hadrons consisting of two light quarks and two heavy antiquarks, (q Q)-(q Q). The spin-dependent term between quarks is known to give an attraction to the $ud$ spin-0 component in the isospin-0 u c d c system, Tcc. However, the said component also gets a repulsion from the partial Pauli-blocking. By the dynamical calculation with a simplified quark model, we discuss that the competition of the two effects leads to a shallow bound state for Tcc, which is preferred from the experiment, and a deep bound state for Tbb.