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Lozano, J. M. Heuser, J. Seixas, K. Banicz, L. Ducroux, M. Floris, M. Keil, NA60 Collaboration: R. Arnaldi, N. Guettet, P. Cortese, P. Force, P. Martins, P. Parracho, P. Pillot, P. Ramalhete, P. Rosinsky, P. Sonderegger, R. Shahoyan, R. Tieulent, R. Veenhof, S. Damjanovic, S. Serci, T. Poghosyan, W. Chen, Z.Li","submitted_at":"2011-04-20T15:40:59Z","abstract_excerpt":"The NA60 experiment at the CERN SPS has studied $\\phi$ meson production in In-In collisions at 158A GeV via both the $K^+K^-$ and the $\\mu^+\\mu^-$ decay channels. The yields and inverse slope parameters of the $m_T$ spectra observed in the two channels are compatible within errors, different from the large discrepancies seen in Pb-Pb collisions between the hadronic (NA49) and dimuon (NA50) decay channels. 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