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)0 → π+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 suppres- sion 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.

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

Bonomi G.;Lea R.;Pagano D.;Rui R.;
2019-01-01

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)0 → π+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 suppres- sion 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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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11379/537476
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