, 72:2183,
Open Access This content is freely available online to anyone, anywhere at any time.
Date: 30 Oct 2012

Production of K (892)0 and ϕ (1020) in pp collisions at \(\sqrt{s}=7\ \mathrm{TeV}\)


The production of K(892)0 and ϕ(1020) in pp collisions at \(\sqrt{s}=7~\mathrm{TeV}\) was measured by the ALICE experiment at the LHC. The yields and the transverse momentum spectra d2 N/dydp T at midrapidity |y|<0.5 in the range 0<p T<6 GeV/c for K(892)0 and 0.4<p T<6 GeV/c for ϕ(1020) are reported and compared to model predictions. Using the yield of pions, kaons, and Ω baryons measured previously by ALICE at \(\sqrt{s}=7\ \mathrm{TeV}\), the ratios K/K, ϕ/K, ϕ/K, ϕ/π , and \((\Omega + \overline{\Omega })/\phi\) are presented. The values of the K/K, ϕ/K and ϕ/K ratios are similar to those found at lower centre-of-mass energies. In contrast, the ϕ/π ratio, which has been observed to increase with energy, seems to saturate above 200 GeV. The \((\Omega + \overline {\Omega })/\phi\) ratio in the p T range 1–5 GeV/c is found to be in good agreement with the prediction of the \(\mathrm{HIJING}/\mathrm{B}\overline{\mathrm{B}}\) v2.0 model with a strong colour field.