Speaker
Alessandro De Falco
(Universita e INFN (IT))
Description
Light vector meson ($\rho$, $\omega$, $\phi$) production provides key information on
the hot and dense state of strongly interacting matter produced in high-energy
heavy-ion collisions. In particular, strangeness production can be accessed
through the measurement of the $\phi$ meson, while the measurement of the
$\rho$ spectral function can be used to reveal in-medium modifications of hadron
properties close to the QCD phase boundary. The detection of vector mesons
through their decay in dileptons has the advantage, with respect to hadronic
decays, that the decay products are not influenced by final state interactions.
The ALICE experiment at the LHC can access vector mesons produced
at forward rapidity through their decays in muon pairs. We
present results on vector meson production in p-Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV
and Pb-Pb collisions at $\sqrt{s_{\rm NN}}=2.76$ TeV.
In p-Pb collisions, measurements of the $\phi$ yield and the nuclear modification factor
in the rapidity ranges $2.03 < y < 3.53$ and $-4.46 < y < -2.96$ are shown.
An asymmetry between the yields at forward and backward rapidity is observed.
Data are compared to the predictions provided by commonly used event generators.
In Pb-Pb collisions, the $\phi$ yield and the nuclear modification factor are obtained
as a function of centrality in the intermediate $p_{\rm T}$ region ($2 < p_{\rm T} < 5$ GeV/$c$)
and for $2.5 < y < 4$.
Dimuon data at forward rapidity are compared to the measurement in the KK channel
at mid rapidity and to theoretical predictions based on hydrodynamic calculations.
| On behalf of collaboration: | ALICE |
|---|
Author
Alessandro De Falco
(Universita e INFN (IT))
