Property Of Strange Particles Productions In Pp Collisions At RHIC And LHC Energies

The Large Hadron Collider (LHC) was formally put into operation at CERN in September,2008. It opens a new ear in the investigation of interaction mechanism of relativistic heavy ion collisions and establishes a new platform to study the properties of QCD matter.It is well known that strangeness production is one of the most important research topics in the relativistic nuclear collisions at the LHC. Compared with u (d) quark pair production, s quark pair productions were assumed to be suppressed in the string fragmentation scheme, and the value of suppression was denoted as quantity λ. Originally, the suppression value was assumed to be fixed. This assumption was confirmed by some experiments at low energies. However, later experiments have shown that this suppression value decreases with increasing reaction energy.The new mechanism of strange quark suppression was proposed in1997, which described the strangeness enhancement in pp, p+A and A+A collisions at CERN SPS energies successfully. The reduction mechanism assumed that the effective string tension increased with increasing reaction energy. Hence the strange quark production increased with increasing reaction energy. And the effective string tension variation with reaction energy was considered by the effective string tension as a function of the number and the hardening of gluons in a single string.In this paper, we think that the reduction mechanism of strange quark suppression could still adapt to explaining the strangeness enhancement at more energies. We systematically investigate strange particle production in pp collisions at RHIC and LHC energies by utilizing the PACIAE model which includes the reduction mechanism. We compare the PACIAE results of strange particle rapidity density at mid-rapidity and the transverse momentum distribution with STAR and ALICE experimental data, as well as the results of PYTHIA model. The K/π ratios were also analyzed. We found PACIAE model simulation results to a certain extent than the PYTHIA model simulation results closer to experimental results. This shows parton evolution (scattering) and the hadron evolution (scattering) were introduced into PACIAE model is reasonable. In the study of strange particles production at the RHIC and LHC energies, considering the reduction mechanism of strange quark suppression can well explain experimental phenomena. Lastly, the inelastic rescattering effect was considered in parton (re)scattering stage, the new calculated results of the transverse momentum spectra of strangeness fitting with data measured by STAR and ALICE Collaborations can be significantly improved, especially at large transverse momentum region.