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

Barioglio L.;Beole S.;Bianchi L.;Botta E.;Ferretti A.;Gagliardi M.;Gallio M.;Masera M.;Puccio M.;Trogolo S.;Vercellin E.;
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.
2019
99
6
064901
064901
http://harvest.aps.org/bagit/articles/10.1103/PhysRevC.99.064901/apsxml
Acharya S.; Acosta F.T.-.; Adamova D.; Adolfsson J.; Aggarwal M.M.; Aglieri Rinella G.; Agnello M.; Agrawal N.; Ahammed Z.; Ahn S.U.; Aiola S.; Akindi...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/1710812
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