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The NA60 experiment has studied low-mass muon pair production inproton-nucleus collisions with a system of Be, Cu, In, W, Pb and U targetsusing a 400 GeV/$c$ proton beam at the CERN SPS. The mass spectrum is welldescribed by the superposition of the two-body and Dalitz decays of the lightneutral mesons $\eta$, $\rho$, $\omega$, $\eta'$ and $\phi$. A newhigh-precision measurement of the electromagnetic transition form factors ofthe $\eta$ and $\omega$ mesons is presented, complemented with a measurement ofthe temperature parameter of the $\rho$ meson in cold nuclear matter. The $\pt$spectra for the $\omega$ and $\phi$ mesons are extracted in the full $\pt$range accessible, up to $\pt = 2$ GeV/$c$. The nuclear dependence of theproduction cross sections for the $\eta$, $\omega$ and $\phi$ mesons has beeninvestigated in terms of the power law $\sigma_\mathrm{pA} \propto\mathrm{A}^\alpha$, and the $\alpha$ parameter was studied as a function of$\pt$.

Low Mass Dimuon Production in p-A Collisions at $\sqrt{s} = 27.5$ GeV with NA60