Doubly heavy tetraquarks including one-pion exchange potential

Spectrum of the doubly heavy tetraquarks is studied in a constituent quark model including one-pion exchange (OPE) potential. Central and tensor forces induced by OPE between two light quarks are considered. Our results show that I(JP)=0(1+) compact bound states are shifted up because of the repulsive central force between q¯q¯. This effect possibly leads to the small binding energy in Tcc. In addition, a I(JP)=1(1+) resonant state is reported with E=10641MeV,Γ=15MeV and E=10640 MeV,Γ=15 MeV, without and with including OPE potential, respectively. The repulsive central force and attractive tensor force almost cancel with each other and leave a small energy difference when OPE potential is included.