Overview of ALICE results on hadronic resonance production

INFN - Sezione di Catania, Via S. Sofia 64, 95123, Catania ( Italy )

^a e-mail: Angela.Badala@ct.infn.it

Published online: 12 April 2017

Abstract

The measurement of hadronic resonance production in heavy-ion collisions is a valuable tool to study the properties of the hadronic phase. In addition, these measurements contribute to the study of particle production mechanisms, such as recombination and statistical hadronization, and can give information on the parton energy loss in the hot QCD medium. Measurement of a wide set of resonances with different lifetimes is useful to better characterize the hadronic phase and the time span between chemical and thermal freezeout. Proton-proton (pp) collisions have been used extensively as a reference for the study of larger colliding systems, but recent measurements performed in high-multiplicity pp and proton-lead (p–Pb) collisions at the LHC have shown features that are reminiscent of those observed in lead-lead (Pb–Pb) collisions. Resonance measurements in small systems serve as a reference for heavy-ion collisions and contribute to searches for collective effects. An overview of recent results on hadronic resonance production measured in ALICE will be presented. Transverse momentum (p_T) spectra, ratios of yield to that of long-lived hadrons of the K*(892)⁰ and ϕ(1020) mesons in pp, p–Pb, and Pb–Pb collisions at LHC energies will be discussed. The most recent results include the measurement of resonance production in pp collisions at 7 TeV as a function of the charged-particle multiplicity, that will be compared to the results for other light hadrons as pions, kaons, protons, K_S⁰, Λ, Ξ⁻, Ω⁻. In addition, the p_T spectra and yields of the ρ(770)⁰ meson in pp and Pb–Pb collisions at √s_NN = 2.76 TeV and of Σ(1385)^± and Ξ(1530)⁰ baryons in p–Pb collisions at √s_NN = 5.02 TeV will be presented.