The effect of hidden-charm strange pentaquarks Pcs on the K- p → J/ψ Λ reaction

초록

Recently, LHCb collaboration has discovered the hidden-charm pentaquarks P_{cs} (4459) with strangeness from the \Xi^-_b\to J/\psi\Lambda K^- decay. We investigate the production of P_{cs} from the K^-p\to J/\psi\Lambda reaction, based on the effective Lagrangian and Regge approaches. Since the spin-parity quantum numbers of P_{cs} are not known experimentally yet, we assign six different sets for the spin and parity quantum numbers for P_{cs}, i.e., 1/2^\pm, 3/2^\pm and 5/2^\pm. We present and discuss the results for the differential and total cross sections of the K^-p\to J/\psi\Lambda reaction, exmaining the dependence of the results on the spin-parity quantum numbers of P_{cs}. The present results may give a hint to determine the spin-parity of P_{cs} for possible future experiments.