Production of K∗(892)0 and ϕ(1020) in pp collisions at

The production of K ∗ (892) 0 and ϕ (1020) in pp collisions at was measured by the ALICE experiment at the LHC. The yields and the transverse momentum spectra d 2 N /d y d p T at midrapidity | y | p T c for K ∗ (892) 0 and 0.4 p T 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 , the ratios K ∗ /K − , ϕ /K ∗ , ϕ /K − , ϕ / π − , and 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 ratio in the p T  range 1–5 GeV/ c is found to be in good agreement with the prediction of the v2.0 model with a strong colour field.