文摘
Charmed tetraquarks and are studied through the S-wave meson-meson interactions, D-D, -D, D- and -, on the basis of the -flavor lattice QCD simulations with the pion mass , 570 and 700 MeV. For the charm quark, the relativistic heavy quark action is employed to treat its dynamics on the lattice. Using the HAL QCD method, we extract the S-wave potentials in lattice QCD simulations, from which the meson-meson scattering phase shifts are calculated. The phase shifts in the isospin triplet () channels indicate repulsive interactions, while those in the channels suggest attraction, growing as decreases. This is particularly prominent in the channel, though neither bound state nor resonance are found in the range . We make a qualitative comparison of our results with the phenomenological diquark picture.
