K⁰S and 𝛬 production in $pp$ interactions at √s=0.9 and 7 TeV measured with the ATLAS detector at the LHC

The production of K⁰S and 𝛬 hadrons is studied in 𝑝⁢𝑝 collision data 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 𝛬̄ 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% in the K⁰S distributions, substantial disagreements are found in the 𝛬 distributions of transverse momentum.