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Dimuon and charm production in nucleus-nucleus collisions at the CERN-SPS

M.C. Abreu B. Alessandro C. Alexa R. Arnaldi J. Astruc 1 M. Atayan C. Baglin 2 A. Baldit 3 M. Bedjidian 4 F. Bellaiche 4 S. Beole V. Boldea P. Bordalo A. Borhani A. Bussiere 2 Laurent Capelli 4 V. Capony 2 L. Casagrande J. Castor 3 T. Chambon 3 B. Chaurand 5 I. Chevrot 3 B. Cheynis 4 E. Chiavassa C. Cicalo T. Claudino M.P. Comets 1 N. Constans 5 S. Constantinescu J. Cruz A. de Falco N. de Marco G. Dellacasa A. Devaux 3 S. Dita O. Drapier 4 L. Ducroux 4 B. Espagnon 3 J. Fargeix 3 F. Fleuret 5 P. Force 3 M. Gallio Y.K. Gavrilov C. Gerschel 1 P. Giubellino M.B. Golubeva M. Gonin 5 A.A. Grigorian J.-Y. Grossiord 6 F.F. Guber A. Guichard 4 H. Gulkanyan R. Hakobyan R. Haroutunian 4 M. Idzik D. Jouan 1 T.L. Karavitcheva L. Kluberg 5 A.B. Kurepin Y. Le Bornec 1 C. Lourenco P. Macciotta M. Mac Cormick 1 A. Marzari-Chiesa M. Masera A. Masoni S. Mehrabyan M. Monteno S. Mourgues 3 A. Musso F. Ohlsson-Malek 4 P. Petiau 5 A. Piccotti J.-R. Pizzi 4 G. Puddu C. Quintans C. Racca 7 L. Ramello S. Ramos P. Rato-Mendes L. Riccati A. Romana 5 I. Ropotar P. Saturnini 3 E. Scomparin S. Serci R. Shahoyan S. Silva M. Sitta C. Soave P. Sonderegger X. Tarrago 1 N.S. Topilskaya G.L. Usai E. Vercellin L. Villatte 1 N. Willis 1
Abstract : Muon pair production in \mbox{p-A}, \mbox{S-U} and \mbox{Pb-Pb}collisions has been studied by the NA38 and NA50 collaborations at theCERN SPS. In this paper we present an analysis of the dimuon invariantmass region between the $\phi$ and the \jpsi. After subtraction ofthe combinatorial background due to $\pi$ and K decays, we find thatthe superposition of dimuons from semi-leptonic decays of D mesons andfrom the Drell-Yan process reproduces well the mass and transversemomentum spectra measured in \mbox{p-A} collisions. From the yield ofopen charm dimuons required to fit our data we extract a charmproduction cross section in good agreement with previous measurements.A linear extrapolation of the \mbox{p-A} sources with the product ofthe mass numbers of the projectile and target nuclei, $A\times B$, underestimates the yield measured in \mbox{S-U} and \mbox{Pb-Pb}collisions. The excess increases with the number of participantnucleons, and the ratio between the observed dimuon yield and theexpected sources reaches a factor 2 for central \mbox{Pb-Pb}interactions. The kinematical distributions of the measured dimuonexcess are compatible with those expected from the open charmcontribution.
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Submitted on : Tuesday, July 4, 2000 - 10:50:08 AM
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M.C. Abreu, B. Alessandro, C. Alexa, R. Arnaldi, J. Astruc, et al.. Dimuon and charm production in nucleus-nucleus collisions at the CERN-SPS. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2000, 14, pp.443-455. ⟨in2p3-00009703⟩

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