Probing the hadronic phase of large hadronizing system through the study of the $\Lambda (1520)$ resonance with ALICE at the LHC.

Agrawal N. per la ALICE Collaboration
  Venerdì 16/09   09:00 - 13:30   Aula B - Maria Goeppert-Mayer   I - Fisica nucleare e subnucleare   Presentazione
The measurement of hadronic resonance production in heavy-ion collisions at the LHC has led to the observation of a prolonged hadronic phase after hadronisation. Due to their short lifetimes, resonances experience the competing effects of regeneration and rescattering of the decay products in the hadronic medium. Studying how the experimentally measured yields are affected by these processes can extend the current understanding of the properties of the hadronic phase and the mechanisms that determine the shape of particle transverse momentum spectra. In this contribution, new preliminary results on the production of the $\Lambda (1520)$ resonance measured in Pb-Pb collisions at $\sqrt{s_{NN}}= 5.02$ TeV with the ALICE detector at the LHC are presented. These results on $\Lambda (1520)$ ($\tau = 12.6$ fm/c) are compared with those from a set of hadronic resonances with a lifetime span of 1 to 46 fm/c such as $\rho (770)^{0}$, $K^{*} (892)^{0}$, $\Sigma (1385)^{\pm}$, $\Xi(1530)^{0}$ and $\Phi (1020)$ measured by the ALICE experiment. The shape of particle transverse momentum ($p_{T}$), mean $p_{T}$ and particle ratios are compared with those from the Blast-Wave, MUSIC with a SMASH afterburner and statistical hadronisation model predictions.