Speaker
Dr
Enrico Fragiacomo
(INFN Trieste (IT))
Description
Hadronic resonance production in pp and Pb-Pb collisions at LHC with the ALICE experiment
Enrico Fragiacomo
INFN Trieste
on behalf of the ALICE Collaboration
Abstract
Resonances, with their lifetime comparable to the lifetime of the partonic plasma phase, are a valuable tool to study the dynamics of the high energy density medium formed in heavy-ion collisions. Resonance measurements can be potentially used to estimate the time span between the chemical and kinetic freeze-out and interaction cross sections in the hadronic phase. Measurements of resonances in proton-proton collisions provide an important baseline for heavy-ion data as well for tuning QCD-inspired particle production models.
The ALICE collaboration has measured K*(892)0 and ϕ(1020) production in Pb-Pb collisions at √sNN=2.76 TeV and in pp collisions at 0.9, 2.76 and 7 TeV . The production of the ϕ meson has been studied in pp collisions at 0.9, 2.76 and 7 TeV, while K*(892)0 and baryonic resonance production (Σ*(1385)± and Ξ*(1530)0) have been measured in 7 TeV pp collisions. Characteristics of resonance production in these collisions systems will be discussed, in particular transverse momentum spectra and ratios such as ϕ/π, ϕ/K, K*/K , (Ω+anti-Ω)/ϕ, Σ*/Ξ, Σ*/π and Σ*/K. A comparison between central and peripheral production as well as one with QCD inspired models (for pp collision data) and thermal models will be shown.
Primary author
Dr
Enrico Fragiacomo
(INFN Trieste (IT))
