# A comparative measurement of $\phi\rightarrow K^+K^-$ and $\phi\rightarrow \mu^+\mu^-$ in In-In collisions at the CERN SPS

Abstract : 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.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00589263
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Submitted on : Thursday, April 28, 2011 - 1:29:11 PM
Last modification on : Thursday, December 16, 2021 - 2:11:12 PM

### Citation

R. Arnaldi, K. Banicz, J. Castor, B. Chaurand, W. Chen, et al.. A comparative measurement of $\phi\rightarrow K^+K^-$ and $\phi\rightarrow \mu^+\mu^-$ in In-In collisions at the CERN SPS. Physics Letters B, Elsevier, 2011, 699, pp.325-329. ⟨10.1016/j.physletb.2011.04.028⟩. ⟨in2p3-00589263⟩

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