Issue |
EPJ Web of Conferences
Volume 97, 2015
Resonance Workshop at Catania
|
|
---|---|---|
Article Number | 00012 | |
Number of page(s) | 8 | |
DOI | https://doi.org/10.1051/epjconf/20159700012 | |
Published online | 22 June 2015 |
https://doi.org/10.1051/epjconf/20159700012
Low mass dilepton production in pp, p–Pb and Pb–Pb collisions with ALICE
Università di Cagliari and INFN Sezione di Cagliari
a e-mail: alessandro.de.falco@ca.infn.it
Published online: 22 June 2015
Low mass vector meson (ρ, ω, ϕ) production provides key information on the hot and dense state of strongly interacting matter produced in high-energy heavy-ion collisions (called Quark-Gluon Plasma, QGP). Strangeness enhancement is one of the possible signatures of the Quark-Gluon Plasma formation and can be accessed through the measurement of ϕ meson production with respect to ρ and ω mesons. The production dynamics and hadronization process in relativistic heavy-ion collisions can be probed through the measurement of the ϕ nuclear modification factor.
We present results on the low mass dimuon analysis in pp, p–Pb and Pb–Pb collisions. In pp collisions at √s = 2.76 TeV the ϕ differential cross section as a function of the transverse momentum has been measured, serving as a baseline for Pb–Pb data.
The ϕ yield and the nuclear modification factor RpPb at forward and backward rapidity have been measured for p–Pb collisions at √s = 5.02 TeV. At forward rapidity, RpPb increases as a function of pT, saturating for pT > 3 GeV/c at RpPb ~ 1. At backward rapidity, RpPb shows an increase as a function of the transverse momentum up to a factor of 1.6 for pT ~ 3-4 GeV/c, followed by a decrease at higher pT.
The ϕ yield and nuclear modification factor RAA have been measured for Pb–Pb collisions at √sNN = 2.76 TeV in the intermediate pT region 2 < pT < 5 GeV/c, as a function of the number of participating nucleons. Remarkable differences are observed in the comparison between the results at forward rapidity in the dimuon channel and the ones measured in the same pT range at midrapidity in the hadronic channel ϕ → KK.
In the dielectron channel at midrapidity, the invariant mass distributions in the range 0 < mee < 3 GeV/c2 are compared with the expected hadronic sources for pp collisions at √s = 7 TeV, and for p–Pb collisions at √sNN = 5.02 TeV. Latest results of the analysis of Pb–Pb collisions at √sNN = 2.76 TeV are presented.
© Owned by the authors, published by EDP Sciences, 2015
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.