EUROPEAN ORGANIZATION FOR NUCLEAR RESEARCH CERN-EP-2018-116 9 May 2018 c  2018 CERN for the benefit of the ALICE Collaboration. Reproduction of this article or parts of it is allowed as specified in the CC-BY-4.0 license. Suppression of Λ(1520) resonance production in central Pb–Pb collisions at √ s NN = 2.76 TeV ALICE Collaboration * Abstract The production yield of the Λ(1520) baryon resonance is measured at mid-rapidity in Pb–Pb colli- sions at √ s NN = 2.76 TeV with the ALICE detector at the LHC. The measurement is performed in the Λ(1520) → pK − (and charge conjugate) hadronic decay channel as a function of the transverse momentum ( p T ) and collision centrality. The p T -integrated production rate of Λ(1520) relative to Λ 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 LHC and the first evidence of Λ(1520) suppression in heavy-ion collisions. The measured Λ(1520)/Λ ratio in central collisions is smaller than the value predicted by the statistical hadronisation model calculations. The shape of the measured p 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. * See Appendix A for the list of collaboration members arXiv:1805.04361v1 [nucl-ex] 11 May 2018