The production of mesons containing strange quarks (K0s, φ) and both singly and doubly strange baryons (Lambda, Lambda_bar, and Xi- + Xi+_bar) are measured at mid-rapidity in pp collisions at √s= 0.9 TeV with the ALICE experiment at the LHC. The results are obtained from the analysis of about 250 k minimum bias events recorded in 2009. Measurements of yields (dN/dy) and transverse momentum spectra at mid-rapidity for inelastic pp collisions are presented. For mesons, we report yields (〈dN/dy〉) of 0.184 ± 0.002(stat.) ± 0.006(syst.) for K0s and 0.021 ± 0.004(stat.) ± 0.003(syst.) for φ. For baryons, we find 〈dN/dy〉=0.048 ± 0.001(stat.) ± 0.004(syst.) for Lambda, 0.047 ± 0.002(stat.) ± 0.005(syst.) for Lambda_bar and 0.0101 ± 0.0020(stat.) ± 0.0009(syst.) for Xi- + Xi+_bar. The results are also compared with predictions for identified particle spectra from QCD-inspired models and provide a baseline for comparisons with both future pp measurements at higher energies and heavy-ion collisions.

Strange particle production in proton–proton collisions at √s= 0.9 TeV with ALICE at the LHC

CAMERINI, Paolo;CONTIN, GIACOMO;LEA, RAMONA;GROSSO, Raffaele;MARGAGLIOTTI, GIACOMO;PIANO, STEFANO;RUI, RINALDO;VACCHI, Andrea;VENARUZZO, MASSIMO;
2011

Abstract

The production of mesons containing strange quarks (K0s, φ) and both singly and doubly strange baryons (Lambda, Lambda_bar, and Xi- + Xi+_bar) are measured at mid-rapidity in pp collisions at √s= 0.9 TeV with the ALICE experiment at the LHC. The results are obtained from the analysis of about 250 k minimum bias events recorded in 2009. Measurements of yields (dN/dy) and transverse momentum spectra at mid-rapidity for inelastic pp collisions are presented. For mesons, we report yields (〈dN/dy〉) of 0.184 ± 0.002(stat.) ± 0.006(syst.) for K0s and 0.021 ± 0.004(stat.) ± 0.003(syst.) for φ. For baryons, we find 〈dN/dy〉=0.048 ± 0.001(stat.) ± 0.004(syst.) for Lambda, 0.047 ± 0.002(stat.) ± 0.005(syst.) for Lambda_bar and 0.0101 ± 0.0020(stat.) ± 0.0009(syst.) for Xi- + Xi+_bar. The results are also compared with predictions for identified particle spectra from QCD-inspired models and provide a baseline for comparisons with both future pp measurements at higher energies and heavy-ion collisions.
http://epjc.edpsciences.org/index.php?option=com_article&access=standard&Itemid=129&url=/articles/epjc/abs/2011/03/10052_2011_Article_1594/10052_2011_Article_1594.html
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/2314019
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