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The NA60 experiment at the CERN SPS has studied low-mass muon pairs in 158AGeV In-In collisions. The mass and pT spectra associated with peripheralcollisions can quantitatively be described by the known neutral meson decays.The high data quality has allowed to remeasure the electromagnetic transitionform factors of the Dalitz decays \eta -> \mu^+\mu^-\gamma and \omega ->\mu^+\mu^-\pi^0. Using the usual pole approximation F =(1-M_{\mu\mu}^{2}/\Lambda^{2})^{-1} for the form factors, we find \Lambda^{-2}(in GeV^{-2}) to be 1.95+-0.17(stat.)+-0.05(syst.) for the \eta and2.24+-0.06(stat.)+-0.02(syst.) for the \omega. While the values agree withprevious results from the Lepton-G experiment, the errors are greatly improved,confirming now on the level of 10\sigma the strong enhancement of the \omegaform factor beyond the expectation from vector meson dominance. An improvedvalue of the branching ratio BR(\omega -> \mu^+\mu^-\pi^0) =[1.73+-0.25(stat.)+-0.14(syst.)]*10^{-4} has been obtained as a byproduct.

Study of the electromagnetic transition form-factors in \eta -> \mu^+\mu^-\gamma and \omega -> \mu^+\mu^-\pi^0 decays with NA60