Studies on the K*Σ bound-state via K+p → K+φp

In the present work, we investigate the hidden-strangeness production process in the S = +1 channel via K(+)p -> K+phi p, focusing on the exotic pentaquark molecular K*Sigma bound-state, assigned by P-s(+) (2071, 3/2(-)). For this purpose, we employ the effective Lagrangian approach in the tree-level Born approximation. Using the experimental and theoretical inputs for the exotic state and for the ground-state hadron interactions, the numerical results show a small but obvious peak structure from P-s(+) with the signalto-background ratio approximate to 1.7%, and it is enhanced in the backward-scattering region of the outgoing K+ in the center-of-mass frame. We also find that the contribution from the K*(1680,1(-)) meson plays an important role to reproduce the data. The proton-spin polarizations are taken into account to find a way to reduce the background. The effects of the possible 27-plet pentaquark Theta(++)(27) is discussed as well.