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

Collaboration Alice , K Aamodt , A Abrahantes , D Adamova , A Adare , Tomasz Traczyk

Abstract

The production of mesons containing strange quarks ( \mbox {\)\mathrm {K^{0}_{S}}\(} , φ) and both singly and doubly strange baryons ( \mbox {\)\mathrm {\Lambda }\(} , \mbox {\)\overline {\mathrm {\Lambda }}\(} , and \mbox {\)\mathrm {\Xi ^{-}+\overline {\Xi }^{+}}\(} ) are measured at mid-rapidity in pp collisions at s√ = 0.9 TeV with the ALICE experiment at the LHC. The results are obtained from the analysis of about 250 k minimum bias events recorded in 2009. Measurements of yields (dN/dy) and transverse momentum spectra at mid-rapidity for inelastic pp collisions are presented. For mesons, we report yields (〈dN/dy〉) of 0.184±0.002(stat.)±0.006(syst.) for \mbox {\)\mathrm {K^{0}_{S}}\(} and 0.021±0.004(stat.)±0.003(syst.) for φ. For baryons, we find 〈dN/dy〉=0.048±0.001(stat.)±0.004(syst.) for \mbox {\)\mathrm {\Lambda }\(} , 0.047±0.002(stat.)±0.005(syst.) for \mbox {\)\overline {\mathrm {\Lambda }}\(} and 0.0101±0.0020(stat.)±0.0009(syst.) for \mbox {\)\mathrm {\Xi ^{-}+\overline {\Xi }^{+}}\(} . 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.
Author Collaboration Alice
Collaboration Alice,,
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, K Aamodt
K Aamodt,,
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, A Abrahantes
A Abrahantes,,
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, D Adamova
D Adamova,,
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, A Adare
A Adare,,
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, Tomasz Traczyk IAiIS
Tomasz Traczyk,,
- The Institute of Control and Computation Engineering
Total number of authors916
Journal seriesThe European Physical Journal C - Particles and Fields, ISSN 1434-6044 [1434-6052]
Issue year2011
Vol71
No1594
Pages1-24
Publication size in sheets1.15
DOIDOI:10.1140/epjc/s10052-011-1594-5
URL http://www.springerlink.com/content/q2k4856833433257/fulltext.pdf
Languageen angielski
Score (nominal)30
Publication indicators WoS Impact Factor: 2015 = 4.912 (2) - 2015=4.362 (5)
Citation count*0
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