Production of High-p_T Kaon and Pion in pp and Au–Au Collisions by Resolved Photoproduction Processes

Taking into account the effects of shadowing and jet quenching, the large transverse momentum distribution of K⁺, π⁺ and K⁺/π⁺ ratios at √s=200 GeV originating from resolved photoproduction processes is calculated based on perturbative quantum chromodynamics. It is found that the contribution of K⁺ and π⁺ produced by photoproduction processes is evident. The K⁺/π⁺ ratios in Au–Au collisions show an obvious enhancement compared with p–p collisions. The numerical results indicate that the photoproduction processes are good modification for kaon and pion production.