A comparative measurement of Φ→K+K- and Φ→μ+μ- in In-In collisions at the CERN SPS

R. Arnaldi, K. Banicz, J. Castor, B. Chaurand, W. Chen, C. Cicalò, A. Colla, P. Cortese, S. Damjanovic, A. David, A. de Falco, A. Devaux, L. Ducroux, H. En'yo, J. Fargeix, A. Ferretti, M. Floris, A. Förster, P. Force, N. GuettetA. Guichard, H. Gulkanian, J. M. Heuser, M. Keil, Z. Li, C. Lourenço, J. Lozano, F. Manso, P. Martins, A. Masoni, A. Neves, H. Ohnishi, C. Oppedisano, P. Parracho, P. Pillot, T. Poghosyan, G. Puddu, E. Radermacher, P. Ramalhete, P. Rosinsky, E. Scomparin, J. Seixas, S. Serci, R. Shahoyan, P. Sonderegger, H. J. Specht, R. Tieulent, A. Uras, G. Usai, R. Veenhof, H. K. Wöhri

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


The NA60 experiment at the CERN SPS has studied meson production meson production in In-In collisions at 158 A GeV via both the K+K- and the μ+μ- decay channels. The yields and inverse slope parameters of the mT mT 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.

Original languageEnglish
Pages (from-to)325-329
Number of pages5
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number5
Publication statusPublished - 2011 May 23
Externally publishedYes


  • Heavy ion collisions
  • φ puzzle

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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