A Comparative Study of K-+/-/pi(+/-) Ratio in Proton-Proton Collisions at Different Energies: Experimental Results versus Model Simulation

摘要

A detailed study of energy dependence of K+/pi(+), K-/pi(-) and total kaon to pion multiplicity ratio ((K+ + K-) / (pi(+) + pi(-)) = K/pi) has been carried out in proton-proton (pp) collisions at root s = 6.3, 17.3, 62.4, 200, and 900 GeV and also at root s = 2.76 TeV and 7 TeV in the framework of UrQMD and DPMJET III model. Dependence of K+/pi(+) and K-/pi(-) on energy shows different behavior for UrQMD and DPMJET III model. The presence of the horn-like structure in the variation of K+/pi(+) and K-/pi(-) with energy for the experimental data is supported by the DPMJET III model. Experimentally it has been observed that as energy increases, the total kaon to pionmultiplicity ratio ((K+ + K-) / (pi(+) + pi(-)) = K/pi) increases systematically for pp collisions at lower energies and becomes independent of energy in LHC energy regime. Our analysis on total kaon to pion multiplicity ratio ((K+ + K-) / (pi(+) + pi(-)) = K/pi) with UrQMD data is well supported by the experimental results obtained by different collaborations in different times. In case of DPMJET III data, the saturation of K/pi ratio at LHC region has not been observed.