Probing the hadronic phase with resonances of different lifetimes in Pb-Pb collisions with ALICE

Abstract

Abstract. The ALICE experiment has measured the production of a rich set of hadronic resonances, such as ρ(770) 0 , K * (892) 0 , φ(1020), Σ ± (1385), Λ(1520) and Ξ * 0 in pp, p-Pb and Pb-Pb collisions at various energies at the LHC. A comprehensive overview and the latest results are presented in this paper. Special focus is given to the role of hadronic resonances for the study of final-state effects in high-energy collisions. In particular, the measurement of resonance production in heavy-ion collisions has the capability to provide insight into the existence of a prolonged hadronic phase after hadronisation. The observation of the suppression of the production of Λ(1520) resonance in central PbPb collisions at √ s NN =2.76 TeV adds further support to the existence of such a dense hadronic phase, as already evidenced by the ratios K * (892) 0 /K and ρ(770) 0 /π.

Hadronic resonance production and interaction in p-Pb collisions at LHC energies in EPOS3

“…The ALICE data indicate that the Λ(1520)/Λ ratio does not change with multiplicity in p-Pb collisions [17] but is suppressed in central Pb-Pb collisions [19]; this trend is also qualitatively described by EPOS3. The ALICE measurement of the Ξ(1530) 0 /Ξ ratio is multiplicityindependent for p-Pb collisions [12], which are also consistent with a preliminary measurement in peripheral Pb-Pb collisions [18]. This behavior is also qualitatively reproduced by EPOS3.…”