The NA60 experiment at the CERN SPS has studied phi meson production in In-In collisions at 158 AGeV 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. Possible physics implications are discussed. (C) 2011 Elsevier B.V. All rights reserved.
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