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The observed dimuon mass spectrum is described as a superposition of resonance decays ($\\eta$, $\\rho$, $\\omega$, $\\eta^{'}$, $\\phi$) into muons and semi-leptonic decays of charmed mesons. The measured production cross sections for $\\omega$ and $\\phi$ are $\\sigma_\\omega$ (1<$p_{\\rm T}$<5 GeV/$c$,2.5<y<4) = 5.28 $\\pm$ 0.54 (stat) $\\pm$ 0.50 (syst) mb and $\\sigma_\\phi$(1<$p_{\\rm T}$<5 GeV/$c$,2.5<y<4)=0.940 $\\pm$ 0.084 (stat) $\\pm$ 0.078 (syst) mb. 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