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The NA60 experiment has studied low-mass muon pair production inproton-nucleus (p-A) collisions with a system of Be, Cu, In, W, Pb and Utargets using a 400 GeV/$c$ proton beam at the CERN SPS. Thanks to thecollected data sample of 180\,000 low mass muon pairs, the most precisemeasurement currently available was performed for the electromagnetictransition form factors of the $\eta$ and $\omega$ mesons. The $\rho$ lineshape was quantitatively investigated, and its effective temperature measuredfor the first time in elementary collisions. The transverse momentum spectrafor the $\omega$ and $\phi$ mesons have been studied in the full $\pt$ rangeaccessible, up to 2 GeV/$c$. The cross section ratios$\sigma_\rho/\sigma_\omega$ and $\sigma_\phi/\sigma_\omega$ have beenconsidered in full $\pt$ as a function of the size of the production target.The nuclear dependence of the production cross sections of the $\eta$, $\omega$and $\phi$ mesons has finally been studied in terms of the power law$\sigma_\mathrm{pA} \propto \mathrm{A}^\alpha$, where the $\alpha$ parameterhas been found to increase as a function of $\pt$.

Light neutral mesons production in p-A collisions at $\sqrt{s} = 27.5$ GeV with the NA60 Experiment