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Low mass dimuon production in p-A collisions at \sqrt{s} = 27.5 GeV with NA60

A. Uras 1
1 ALICE
IP2I Lyon - Institut de Physique des 2 Infinis de Lyon
Abstract : The NA60 experiment has studied low-mass muon pair production in proton-nucleus collisions with a system of Be, Cu, In, W, Pb and U targets using a 400 GeV/c proton beam at the CERN SPS. The mass spectrum is well described by the superposition of the two-body and Dalitz decays of the light neutral mesons η, ρ, ω, η' and phi. A new high-precision measurement of the electromagnetic transition form factors of the η and ω mesons is presented, complemented with a measurement of the temperature parameter of the ρ meson in cold nuclear matter. The pT spectra for the ω and phi mesons are extracted in the full pT range accessible, up to pT = 2 GeV/c. The nuclear dependence of the production cross sections for the η, ω and phi mesons has been investigated in terms of the power law σpA∝Aα, and the α parameter was studied as a function of pT.
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Submitted on : Thursday, January 5, 2012 - 11:16:32 AM
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A. Uras. Low mass dimuon production in p-A collisions at \sqrt{s} = 27.5 GeV with NA60. Quark Matter 2011 - 22nd International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions, May 2011, Annecy, France. pp.124180, ⟨10.1088/0954-3899/38/12/124180⟩. ⟨in2p3-00656814⟩

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