Production of the ρ(770)0 meson in pp and Pb-Pb collisions at √sNN = 2.76 TeV
Acharya, Shreyasi; Acosta, Fernando Torales; Adamová, Dagmar; Adolfsson, Jonatan; Aggarwal, Madan M.; Aglieri Rinella, Gianluca; Agnello, Michelangelo; Agrawal, Neelima; Ahammed, Zubayer; Ahn, Sang Un; Alme, Johan; Altenkaemper, Lucas; Djuvsland, Øystein; Ersdal, Magnus Rentsch; Fionda, Fiorella Maria Celeste; Nystrand, Joakim; Rehman, Attiq ur; Røhrich, Dieter; Tambave, Ganesh Jagannath; Ullaland, Kjetil; Velure, Arild; Wagner, Boris; Zhou, Zhuo; Arsene, Ionut Cristian; Bätzing, Paul Christoph; Dordic, Olja; Lardeux, Antoine Xavier; Lindal, Svein; Mahmood, Sohail Musa; Richter, Matthias; Røed, Ketil; Skaali, Toralf Bernhard; Tveter, Trine Spedstad; Wikne, Jon Christopher; Zhao, Chengxin; Helstrup, Håvard; Hetland, Kristin Fanebust; Kileng, Bjarte; Nesbø, Simon Voigt; Storetvedt, Maksim Melnik; Langøy, Rune; Lien, Jørgen André; Aiola, Salvatore; Akindinov, Alexander; Al-Turany, Mohammed; Alam, Sk Noor; De Albuquerque, Danilo Silva; Aleksandrov, Dimitry; Alessandro, Bruno; Alfaro Molina, José Rubén; ALICE, Collaboration
Peer reviewed, Journal article
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The production of the ρ ( 770 ) 0 meson has been measured at midrapidity ( | y | < 0.5 ) in p p and centrality differential Pb-Pb collisions at √ s N N = 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 ( p T ) range 0.5–11 GeV / c . A centrality-dependent suppression of the ratio of the integrated yields 2 ρ ( 770 ) 0 / ( π + + π − ) is observed. The ratio decreases by ∼ 40 % from p p to central Pb-Pb collisions. A study of the p T -differential 2 ρ ( 770 ) 0 / ( π + + π − ) 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 p p 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.