Strange particle production in proton-proton collisions at root s=0.9 TeV with ALICE at the LHC

TY - JOUR

T1 - Strange particle production in proton-proton collisions at root s=0.9 TeV with ALICE at the LHC

AU - Aamodt...[et al.], K.

AU - Bearden, Ian

AU - Bøggild, Hans

AU - Christensen, Christian Holm

AU - Gulbrandsen, Kristjan Herlache

AU - Gaardhøje, Jens Jørgen

AU - Dalsgaard, Hans Hjersing

AU - Nielsen, Børge Svane

AU - Søgaard, Carsten

PY - 2011/3/30

Y1 - 2011/3/30

N2 - The production of mesons containing strange quarks (K0 S, ϕ) and both singly and doubly strange baryons (⋀, ⊼, and Ξ− +Ξ+) 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 K0 S 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 ⋀, 0.047 ± 0.002(stat.) ± 0.005(syst.) for ⊼ and 0.0101 ± 0.0020(stat.) ± 0.0009(syst.) for Ξ− +Ξ+. 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.

AB - The production of mesons containing strange quarks (K0 S, ϕ) and both singly and doubly strange baryons (⋀, ⊼, and Ξ− +Ξ+) 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 K0 S 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 ⋀, 0.047 ± 0.002(stat.) ± 0.005(syst.) for ⊼ and 0.0101 ± 0.0020(stat.) ± 0.0009(syst.) for Ξ− +Ξ+. 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.

U2 - 10.1140/epjc/s10052-011-1594-5

DO - 10.1140/epjc/s10052-011-1594-5

M3 - Journal article

SN - 1434-6044

VL - 71

SP - 1594-

JO - The European Physical Journal C: Particles and Fields

JF - The European Physical Journal C: Particles and Fields

IS - 3

ER -