Abstract
The production of K$^{*}$(892)$^{0}$ and $\phi$(1020) in pp collisions at $\sqrt{s}=7$ TeV was measured by the ALICE experiment at the LHC. The yields and the transverse momentum spectra d$^{2}$N/d$y$d$p_{\rm T}$ at midrapidity $|y|<0.5$ in the range $0<p_{\rm T}<6$ GeV/$c$ for K$^{*}$(892)$^{0}$ and $0.4<p_{\rm T}<6$ GeV/$c$ for $\phi$(1020) are reported and compared to model predictions. Using the yield of pions, kaons, and Omega baryons measured previously by ALICE at $\sqrt{s}=7$ TeV, the ratios K$^{*}$/K$^{-}$, $\phi$/K$^{*}$, $\phi$/K$^{-}$, $\phi/\pi^{-}$, and ($\Omega$ + $\overline{\Omega}$)/$\phi$ are presented. The values of the K$^{*}$/K$^{-}$, $\phi$/K$^{*}$ and $\phi$/K$^{-}$ ratios are similar to those found at lower centre-of-mass energies. In contrast, the $\phi/\pi^{-}$ ratio, which has been observed to increase with energy, seems to saturate above 200 GeV. The ($\Omega$ + $\overline{\Omega}$)/$\phi$ ratio in the $p_{\rm T}$ range $1$-$5$ GeV/$c$ is found to be in good agreement with the prediction of the HIJING/BB v2.0 model with a strong colour field.
Highlights
The study of resonance production plays an important role both in elementary and in heavy ion collisions
In pp and e+e− collisions it contributes to the understanding of hadron production [1, 2] as the decay products of resonances represent a large fraction of the final state particles
For the analyses described in this paper, the Inner Tracking System (ITS), the TPC, and the Time of Flight (TOF) detectors were used
Summary
The study of resonance production plays an important role both in elementary and in heavy ion collisions. In pp and e+e− collisions it contributes to the understanding of hadron production [1, 2] as the decay products of resonances represent a large fraction of the final state particles It provides a reference for tuning event generators inspired by Quantum Chromodynamics (QCD). The ratios K∗/K−, φ/K∗, φ/K−, and φ/π − are computed using the yield of pions and kaons measured [12] with the ALICE detector in pp collisions at 7 TeV. These ratios are compared with measurements at lower collision energies.
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