Low mass dimuon production in proton-nucleus collisions with the NA60 apparatus期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Low mass dimuon production in proton-nucleus collisions with the NA60 apparatus

Authors:	H K Wöhri

Institution:	H. K. W?hri and The NA60 Collaboration

Abstract:	During the June 2002 run NA60 collected around 600 000 dimuon triggers in proton-nucleus collisions at 400 GeV. We show that the collected dimuon mass spectra can be understood in terms of known sources. The specific target setup, consisting of Beryllium, Indium and Lead targets, simultaneously exposed to the beam, allowed us to study the nuclear dependence of the production cross-section of the $\omega$ and $\phi$ resonances. The elementary nucleon-nucleon production cross-sections at 400 GeV for the $\rho$ , $\omega$ and $\phi$ mesons are also presented. By using the $\eta$ -Dalitz decay, dominating the mass range below 450 MeV, we, furthermore, extracted the $\eta$ production cross-section and its nuclear dependence. The results are discussed in the framework of previous measurements, mostly obtained in different decay channels, performed by NA27, HELIOS-1 and CERES-TAPS. Arrival of the final proofs: 1 July 2005 PACS: 25.75.Dw, 25.75.Nq

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