• Open Access

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

S. Acharya et al. (ALICE Collaboration)
Phys. Rev. C 99, 064901 – Published 4 June 2019

Abstract

The production of the ρ(770)0 meson has been measured at midrapidity (|y|<0.5) in pp and centrality differential Pb-Pb collisions at sNN= 2.76 TeV with the ALICE detector at the Large Hadron Collider. The particles have been reconstructed in the ρ(770)0π+π decay channel in the transverse-momentum (pT) range 0.5–11 GeV/c. A centrality-dependent suppression of the ratio of the integrated yields 2ρ(770)0/(π++π) is observed. The ratio decreases by 40% from pp to central Pb-Pb collisions. A study of the pT-differential 2ρ(770)0/(π++π) ratio reveals that the suppression occurs at low transverse momenta, pT<2 GeV/c. 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.

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  • Received 24 May 2018

DOI:https://doi.org/10.1103/PhysRevC.99.064901

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

©2019 CERN, for the ALICE Collaboration

Physics Subject Headings (PhySH)

Nuclear PhysicsParticles & Fields

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Vol. 99, Iss. 6 — June 2019

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