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

Abstract

The NA60 experiment has studied low-mass muon pair production in proton-nucleus collisions with a system of Be, Cu, In, W, Pb and U targets using a 400 GeV/$c$ proton beam at the CERN SPS. The mass spectrum is well described by the superposition of the two-body and Dalitz decays of the light neutral mesons $\eta$, $\rho$, $\omega$, ${\eta }^{\prime }$ and $\varphi$. A new high-precision measurement of the electromagnetic transition form factors of the $\eta$ and $\omega$ mesons is presented, complemented with a measurement of the temperature parameter of the $\rho$ meson in cold nuclear matter. The $\pt$ spectra for the $\omega$ and $\varphi$ mesons are extracted in the full $\pt$ range accessible, up to $\pt = 2$ GeV/$c$. The nuclear dependence of the production cross sections for the $\eta$, $\omega$ and $\varphi$ mesons has been investigated in terms of the power law ${\sigma }_{\mathrm{pA}}\propto {\mathrm{A}}^{\alpha }$, and the $\alpha$ parameter was studied as a function of $\pt$.

References in corpus (2)

• Study of the electromagnetic transition form-factors in η-> μ^+μ^-γand ω-> μ^+μ^-π^0 decays with NA60
• Evidence for the production of thermal muon pairs with masses above 1 GeV/c^2 in 158A GeV Indium-Indium Collisions

Cited by in corpus (5)

• Precision study of the $\eta \to {\mu }^{+}{\mu }^{-}\gamma$ and $\omega \to {\mu }^{+}{\mu }^{-}{\pi }^0$ electromagnetic transition form-factors and of the $\rho \to {\mu }^{+}{\mu }^{-}$ line shape in NA60
• Light vector meson production in pp collisions at $\sqrt{s}$ = 7 TeV
• Dilepton Radiation from Strongly Interacting Systems
• $\varphi$ meson production at forward rapidity in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV
• Data-Driven Predictions for Dark Photon and Millicharged Particle Production