Production of the ρ(770) 0 meson in pp and Pb–Pb collisions at √sNN = 2.76 TeV
Abstract
The production of the rho(770)(0) meson has been measured at midrapidity
(vertical bar y vertical bar < 0.5) in pp and centrality differential
Pb-Pb collisions at root S-NN = 2.76 TeV with the ALICE detector at the
Large Hadron Collider. The particles have been reconstructed in the
rho(770)(0) -> pi(+)pi(-) 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 rho(770)(0)/(pi(+)+pi(-)) is observed.
The ratio decreases by similar to 40\% from pp to central Pb-Pb
collisions. A study of the p(T)-differential 2 rho(770)(0)/(pi(+) +
pi(-)) ratio reveals that the suppression occurs at low transverse
momenta, P-T < 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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