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Low mass dimuon production in indium-indium collisions at the CERN SPS

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HAL-IN2P3
Keywords
  • [Phys.Nexp] Physics [Physics]/Nuclear Experiment [Nucl-Ex]
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Abstract

NA60 is a fixed-target experiment at the CERN SPS which measured dimuon production in nucleus-nucleus and proton-nucleus collisions. In this paper we report on a precision measurement of low-mass muon pairs in 158 AGeV indium-indium collisions. A significant excess of pairs is observed above the yield expected from neutral meson decays. The excess can be isolated by subtraction of expected sources, thanks to the excellent mass resolution and large sample size.

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