J/ψ\psi production in In-In and p-A collisions

The NA60 experiment studies dimuon production in In-In and p-A collisions at the CERN SPS. We report recent results on \jpsi production, measured through its muon pair decay. As a function of centrality, we show that in In-In the \jpsi yield is suppressed beyond expectations from nuclear absorption. We present also for the first time results on \jpsi production in p-A collisions at 158 GeV, the same energy of the nucleus-nucleus data. For both p-A and In-In we show preliminary results on \psip suppression. Finally, we have studied the kinematical distributions of the \jpsi produced in In-In collisions. We present results on transverse momentum and rapidity, as well as on the angular distribution of the \jpsi decay products.Comment: 8 pages, Quark Matter 2006 conference proceeding

In-medium vector mesons and low mass lepton pairs from heavy ion collisions

The rho and omega meson self-energy at finite temperature and baryon density have been analysed for an exhaustive set of mesonic and baryonic loops in the real time formulation of thermal field theory. The large enhancement of spectral strength below the nominal rho mass is seen to cause a substantial enhancement in dilepton pair yield in this mass region. The integrated yield after space-time evolution using relativistic hydrodynamics with quark gluon plasma in the initial state leads to a very good agreement with the experimental data from In-In collisions obtained by the NA60 collaboration.Comment: Invited Talk at the DAE-BRNS Workshop on Hadron Physics, Bhabha Atomic Research Centre, Mumbai, India, October 31-November 4, 201

J/ΨJ/\Psi production in Cu+CuCu+Cu and Au+AuAu+Au collisions measured by PHENIX at RHIC

PHENIX preliminary results on the $J/\Psi$ production in $Cu+Cu$ and $Au+Au$ collisions at $\sqrt{s_{NN}}=200$ GeV are presented. They are compared to results from lower energy experiments NA50 and NA60 at CERN SPS and to expectations from various theoretical models.Comment: 4 pages, 7 figures, Proceedings for the SQM2006 Conference, submitted to "Journal of Physics G: Nuclear and Particle Physics

NA60 results on pTp_T spectra and the ρ\rho spectral function in In-In collisions

The NA60 experiment at the CERN SPS has studied low-mass muon pairs in 158 AGeV In-In collisions. A strong excess of pairs is observed above the yield expected from neutral meson decays. The unprecedented sample size of close to 400K events and the good mass resolution of about 2% have made it possible to isolate the excess by subtraction of the decay sources (keeping the $\rho$). The shape of the resulting mass spectrum exhibits considerable broadening, but essentially no shift in mass. The acceptance-corrected transverse-momentum spectra have a shape atypical for radial flow and show a significant mass dependence, pointing to different sources in different mass regions.Comment: 4 pages, 4 figures, Quark Matter 2006 conference proceeding

NA60 results on Quarkonia

The NA60 experiment at CERN SPS has performed a study of J/Psi production in p-A collisions at 158 GeV incident energy. For the first time it has been possible to study cold-nuclear matter effects at the same energy as In-In and Pb-Pb collisions, where an "anomalous J/Psi suppression" had been observed. We present preliminary results on the J/Psi absorption cross section at 158 GeV and compare them with a "reference measurement" taken with the same apparatus at 400 GeV and with other results available in the literature

Latest results from NA60

NA60 is a fixed target experiment at the CERN SPS studying dimuon production in different colliding systems: In-In at 158 A GeV incident energy and p-A collisions at 158 and 400 GeV. A strong excess of dimuon pairs has been observed in the region of the invariant mass spectrum below the J/ψ. The high resolution of the NA60 detector allowed to measure the in-medium modifications of the ρ spectral function and to clarify the origin of the dimuon excess in the region above the . The J/ψ suppression has been studied in In-In and p-A collisions at 158 GeV incident energy. The latest results on these topics are addressed in this paper

Recent results from the CERN NA60 experiment

NA60 is a CERN SPS experiment that studied dimuon production in In-In collisions at 158 A\ub7GeV per nucleon. More recently proton nucleus collisions have also been investigated in order to provide a reference for heavy ion studies. Some of the most important results obtained by the experiment are the first measurement of the rho spectral function in nuclear collision and the study of its medium-induced modifications, the production of thermal muon pairs in the invariant mass region between the phi and the J/psi, and the study of the J/psi suppression. Recent results include further studies on the characterization of thermal pairs, the comparison of phi production in \ub5\ub5 and KK channels (the phi puzzle) and the first measurement of cold nuclear matter effects on J/psi production at 158 GeV, the same energy where the anomalous J/psi suppression has been observed

Latest results from NA60

NA60 is a fixed target experiment at the CERN SPS studying dimuon production in different colliding systems: In-In at 158 A GeV incident energy and p-A collisions at 158 and 400 GeV. A strong excess of dimuon pairs has been observed in the region of the invariant mass spectrum below the J/?. The high resolution of the NA60 detector allowed to measure the in-medium modifications of the ? spectral function and to clarify the origin of the dimuon excess in the region above the phi. The J/? suppression has been studied in In-In and p-A collisions at 158 GeV incident energy. The latest results on these topics are addressed in this paper