Production of the ρ(770)0 meson in pp and Pb-Pb collisions at sNN =2.76 TeV

Abstract

The production of the ( The particles have been reconstructed in the (770) 0 + -decay channel in the transverse-momentum (p T ) range 0.5-11 GeV/c. A centrality-dependent suppression of the ratio of the integrated yields 2(770) 0 /( + + -) is observed. The ratio decreases by 40% from pp to central Pb-Pb collisions. A study of the p T -differential 2( At higher momentum, particle ratios measured in heavy-ion and pp collisions are consistent. The observed suppression is very similar to that previously measured for the K * (892) 0 /K ratio and is consistent with EPOS3 predictions that may imply that rescattering in the hadronic phase is a dominant mechanism for the observed suppression.