A comparative measurement of $φ\rightarrow K^+K^-$ and $φ\rightarrow μ^+μ^-$ in In-In collisions at the CERN SPS

Details A comparative measurement of $φ\rightarrow K^+K^-$ and $φ\rightarrow μ^+μ^-$ in In-In collisions at the CERN SPS A comparative measurement of $φ\rightarrow K^+K^-$ and $φ\rightarrow μ^+μ^-$ in In-In collisions at the CERN SPS

2011-04-20

arxiv.org/abs/1104.4060v1

Phys.Lett.B699:325-329,2011

Physics

Nuclear Physics

Nuclear Experiment

Scientific paper

10.1016/j.physletb.2011.04.028

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. Possible physics implications are discussed.

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