Study of the Production of Strange Particles in Proton-Proton Collisions at √s=0.9 TeV

The differential yield of strange mesons (Ks0,phi) and singly and doubly strange baryons (Lambda, Lambda and Xi) in pp collision at 0.9 TeV in the transverse momentum (p(T)) ranging from 0.1 to 3.5 GeV/c and in the rapidity region of |y|<0.75 is reported. The spectra obtained by Monte Carlo simulations with event generators: EPOS 1.99, EPOS-LHC, HIJING 1.38, QGSJETII-04 and Sibyll2.3c, are compared with the ALICE measurements. For Ks0, EPOS-LHC, Sibyll2.3c and QGSJETII-04 models' predictions are closer to the experimental data at low p(T). For Lambda and Lambda, EPOS 1.99 and QGSJETII-04 predict in some of the p(T) regions, while only EPOS 1.99 model predicts well the Xi spectra. QGSJETII-04 and Sibyll2.3c predict well the distribution of phi mesons at high p(T). For Lambda/Ks0, only QGSJETII-04 predicts the ratio very well. Although the models are qualitatively compatible with the data, none of them predict all the distributions over the entire p(T) range.