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ATLAS_2011_I944826

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The production of KS and Λ hadrons is studied in inelastic pp collisions at s=0.9 and 7 TeV collected with the ATLAS detector at the LHC using a minimum-bias trigger. The observed distributions of transverse momentum, rapidity, and multiplicity are corrected to hadron level in a model-independent way within well defined phase-space regions. The distribution of the production ratio of ˉΛ to Λ baryons is also measured. The results are compared with various Monte Carlo simulation models. Although most of these models agree with data to within 15 percent in the KS distributions, substantial disagreements with data are found in the Λ distributions of transverse momentum. Beam energy must be specified (in GeV) as analysis option "ENERGY" when rivet-merging samples.

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