Abstract
Modifications to the masses and widths of hadronic resonances in heavy-ion collisions could be a sign of chiral symmetry restoration. Uncorrected spectra, masses, and widths of the phi(1020) and K*(892)0 resonances have been measured in Pb-Pb collisions at 2.76 TeV using the ALICE detector. These measurements are presented and compared to resonances in other collision systems.
Highlights
Hadronic resonances are important probes of heavy-ion collisions and can allow us to study the properties of the system at different stages of its evolution
The φ mass is found to be compatible with its vacuum value [14] within 0.5 MeV/c2; the width is found to be compatible with its vacuum value within 2 MeV/c2
The method proposes that the resonances most likely to exhibit the signatures of chiral symmetry restoration are those on the away side from a trigger jet or hadron with pT > 2 GeV/c
Summary
Hadronic resonances are important probes of heavy-ion collisions and can allow us to study the properties of the system at different stages of its evolution. Resonances have short enough lifetimes (a few fm/c) that they may decay before freeze-out. The products of their hadronic decays may be rescattered due to interactions in the hadronic medium [1–4], reducing the measured resonance signal. The competition between resonance generating processes and re-scattering, and the ratio of resonance yields to non-resonance yields, is governed by the lifetime and temperature of the hadronic medium. Thermal models [3,5–8] can be used to predict particle ratios as functions of the chemical freeze-out temperature (Tch) and the time between chemical and thermal freeze-out. Comparing model predictions to measurements of particle ratios allows us to tune the model parameters and extract estimates of Tch and the lifetime of the hadronic phase
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