K_s⁰ and L Production in pp Collisions at Ultra-relativistic Energy

The transverse momentum spectrum of K_s⁰ and Λ in relativistic heavy-ion collisions is calculated based on perturbative quantum chromodynamics.It is found that the initial parton production processes are prominent and the contribution of photoproduction processes is evident at LHC energies.By taking into account the photoproduction processes,the theoretical simulations could give nice descriptions of experimental data.The numerical results indicate that the modification of photoproduction processes of K_s⁰ and Λ cannot be negligible in relativistic heavy-ion collisions.