Suppression of $\Lambda (1520)$ resonance production in central Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV

Abstract

The production yield of the $\Lambda (1520)$ baryon resonance is measured at mid-rapidity in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV with the ALICE detector at the LHC. The measurement is performed in the $\Lambda (1520)\to {\mathrm{pK}}^{-}$ (and charge conjugate) hadronic decay channel as a function of the transverse momentum ($p_{\mathrm{T}}$) and collision centrality. The $p_{\mathrm{T}}$-integrated production rate of $\Lambda (1520)$ relative to $\Lambda$ in central collisions is suppressed by about a factor of 2 with respect to peripheral collisions. This is the first observation of the suppression of a baryonic resonance at the LHC and the first 3$\sigma$ evidence of $\Lambda (1520)$ suppression within a single collision system. The measured $\Lambda (1520)/\Lambda$ ratio in central collisions is smaller than the value predicted by the statistical hadronisation model calculations. The shape of the measured $p_{\mathrm{T}}$ distribution and the centrality dependence of the suppression are reproduced by the EPOS3 Monte Carlo event generator. The measurement adds further support to the formation of a dense hadronic phase in the final stages of the evolution of the fireball created in heavy-ion collisions, lasting long enough to cause a significant reduction in the observable yield of short-lived resonances.

16 pages, 4 captioned figures, 2 tables, authors from page 12, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/4279

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• Formation and decay of hadronic resonances in the QGP

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