The NA60 experiment at the CERN SPS studies dimuon production in proton-nucleus and nucleus-nucleus collisions. The combined information from a novel vertex telescope made of radiation-tolerant silicon pixel detectors and from the muon spectrometer previously used in NA50 allows for a precise measurement of the muon vertex and a much improved dimuon mass resolution. We report on first results from the data taken for Indium-Indium collisions at 158 AGeV/nucleon in 2003, concentrating on a subsample of about 370 000 muon pairs in the mass range $<1.2$ GeV/$c^{2}$. The light vector mesons $\omega$ and $\phi$ are completely resolved, with a mass resolution of about 23 MeV/$c^{2}$ at the $\phi$. The transverse momentum spectra of the $\phi$ are measured over the continuous range $0<p_{\rm T}<2.5$ GeV/c; the inverse slope parameter of the spectra is found to increase with centrality, with an average value of $T=252\pm3$ MeV.

First results from NA60 on low mass muon pair production in In-In collisions at 158-GeV/nucleon

FERRETTI, Alessandro;
2005

Abstract

The NA60 experiment at the CERN SPS studies dimuon production in proton-nucleus and nucleus-nucleus collisions. The combined information from a novel vertex telescope made of radiation-tolerant silicon pixel detectors and from the muon spectrometer previously used in NA50 allows for a precise measurement of the muon vertex and a much improved dimuon mass resolution. We report on first results from the data taken for Indium-Indium collisions at 158 AGeV/nucleon in 2003, concentrating on a subsample of about 370 000 muon pairs in the mass range $<1.2$ GeV/$c^{2}$. The light vector mesons $\omega$ and $\phi$ are completely resolved, with a mass resolution of about 23 MeV/$c^{2}$ at the $\phi$. The transverse momentum spectra of the $\phi$ are measured over the continuous range $0
8th International Conference on Strangeness in Quark Matter (SQM2004)
Cape Town, South Africa
15-20 Sep 2004.
31
S903
S909
R. ARNALDI; R. AVERBECK; K. BANICZ; K. BORER; J. BUYTAERT; J. CASTOR; B. CHAURAND; W. CHEN; B. CHEYNIS; C. CICALO; A. COLLA; P. CORTESE; A. DAVID; A. DE FALCO; N. DE MARCO; A. DEVAUX; A. DREES; L. DUCROUX; H. ENYO; A. FERRETTI; M. FLORIS; A. FORSTER; P. FORCE; A. GRIGORIAN; J.-Y. GROSSIORD; N. GUETTET; A. GUICHARD; H. GULKANIAN; J. HEUSER; M. KEIL; L. KLUBERG; Z. LI; C. LOURENCO; J. LOZANO; F. MANSO; P. MARTINS; A. MASONI; A. NEVES; H. OHNISHI; C. OPPEDISANO; P. PARRACHO; P. PILLOT; G. PUDDU; E. RADERMACHER; P. RAMALHETE; P. ROSINKY; E. SCOMPARIN; J. SEIXAS; S. SERCI; R. SHAHOYAN; P. SONDEREGGER; H.J. SPECHT; R. TIEULENT; E. TVEITEN; G. USAI; H. VARDANYAN; R. VEENHOF; H.K. WOEHRI
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2318/21867
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