Abstract
The yields of the and resonances are measured in Pb-Pb collisions at TeV through their hadronic decays using the ALICE detector. The measurements are performed in multiple centrality intervals at mid-rapidity in the transverse-momentum ranges for the and for the . The yields of are suppressed in central Pb-Pb collisions with respect to and peripheral Pb-Pb collisions (perhaps due to rescattering of its decay products in the hadronic medium), while the longer-lived meson is not suppressed. These particles are also used as probes to study the mechanisms of particle production. The shape of the distribution of the meson, but not its yield, is reproduced fairly well by hydrodynamic models for central Pb-Pb collisions. In central Pb-Pb collisions at low and intermediate , the ratio is flat in , while the and ratios show a pronounced increase and have similar shapes to each other. These results indicate that the shapes of the distributions of these particles in central Pb-Pb collisions are determined predominantly by the particle masses and radial flow. Finally, production in Pb-Pb collisions is enhanced, with respect to the yield in collisions and the yield of charged pions, by an amount similar to the and .
7 More- Received 15 April 2014
- Revised 8 December 2014
DOI:https://doi.org/10.1103/PhysRevC.91.024609
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©2015 CERN, for the ALICE Collaboration