Speaker
Description
Based on a contact lagrangian possessing the SU(3) flavor and SU(2) spin symmetries, we discuss the symmetry properties of the interactions among the heavy flavor meson-baryon $P_c$ ([$n\bar{c}$][$nnc$]), $P_{cs}$ ([$s\bar{c}$][$nnc$] and [$n\bar{c}$][$nsc$]) systems and the baryon-baryon $H_c$ ([$nnc$][$ncc$]), $H_{cs}$ ([$nnc$][$scc$] and [$nsc$][$ncc$]) systems (with $n=u$, $d$). The light quark components of the $P_c$ ($P_{cs}$) and $H_{c}$ ($H_{cs}$) systems have identical flavors, the interactions generated from the exchanges of light mesons in the $P_c$ ($P_{cs}$) systems should be very similar to that of the $H_c$ ($H_{cs}$) systems. We perform the single-channel and multi-channel calculations on the $P_c/P_{cs}/H_c/H_{cs}$ systems and introduce the SU(3) breaking effect to identify the different mass spectra among the $P_c$ ($H_c$) and $P_{cs}$ ($H_{cs}$) systems. We suggest two kinds of evidences for the existence of the flavor-spin symmetry among the heavy flavor molecule community, i.e., the mass arrangement of the $P_c/H_c/P_{cs}/H_{cs}$ and the similar binding energies of the heavy flavor meson-baryon (baryon-baryon) systems with the same contact potentials.
