Low mass dimuon production in pp, p–Pb and Pb–Pb collisions with the ALICE muon spectrometer

We present results on the low mass dimuon analysis in pp, p-Pb and Pb-Pb collisions.

In pp collisions at $\sqrt{s}$= 2.76 TeV the ϕ differential cross section as a function of the transverse momentum has been measured, while the ϕ yield and the nuclear modification factor R_pPb at forward and backward rapidity have been measured in p-Pb collisions at $\sqrt{s_{NN}}$ = 5.02 TeV. The $\frac{BR{\sigma }_{\varphi }}{BR{\sigma }_{\rho }+BR{\sigma }_{\omega }}$. ratio and the 0 nuclear modification factor R_AA have been measured in Pb-Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV in the intermediate p_T region 2 < p_T < 5 GeV/c, as a function of the number of participating nucleons. Remarkable differences are observed in the comparison between these results and the ones measured in the same p_T range at midrapidity in the hadronic decay channel ϕ → KK. (paper)