Enhanced Production of Low-Mass Electron Pairs in 200 GeV/Nucleon S-Au Collisions at the CERN Super Proton Synchrotron
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Enhanced Production of Low-Mass Electron Pairs in 200 GeV/Nucleon S-Au Collisions at the CERN Super Proton Synchrotron

G. Agakichiev,R. Baur,A. Breskin,R. Chechik,A. Drees,C. Jacob,U. Faschingbauer,P. Fischer,Z. Fraenkel,Ch. Fuchs,E. Gatti,P. Glässel,Th. Günzel,Carlos Perez De Los Heros,F. Hess,D. Irmscher,B. Lenkeit,L. H. Olsen,Y. Panebrattsev,A. Pfeiffer,I. Ravinovich,P. Rehak,A. Schön,J. Schukraft,M. Sampietro,S. Shimansky,A. Shor,H. J. Specht,V. Steiner,S. Tapprogge,G. Tel-Zur,I. Tserruya,Th. Ullrich,J. P. Wurm,V. Yurevich;G. Agakichiev;R. Baur;A. Breskin;R. Chechik;A. Drees;C. Jacob;U. Faschingbauer;P. Fischer;Z. Fraenkel;Ch. Fuchs;E. Gatti;P. Glässel;Th. Günzel;Carlos Perez De Los Heros;F. Hess;D. Irmscher;B. Lenkeit;L. H. Olsen;Y. Panebrattsev;A. Pfeiffer;I. Ravinovich;P. Rehak;A. Schön;J. Schukraft;M. Sampietro;S. Shimansky;A. Shor;H. J. Specht;V. Steiner;S. Tapprogge;G. Tel-Zur;I. Tserruya;Th. Ullrich;J. P. Wurm;V. Yurevich;
physical review letters 1995 Vol. 75 pp. 1272-1275
168
yurevich1995physicalenhanced

Abstract

We report on measurements of low-mass electron pairs in 450 GeV p-Be, p-Au, and 200 GeV/nucleon S-Au collisions at central rapidities. For the proton induced interactions, the low-mass spectra are, within the systematic errors, satisfactorily explained by electron pairs from hadron decays, whereas in the S-Au system an enhancement over the hadronic contributions by a factor of 5.0±0.7(stat)±2.0(syst) in the invariant mass range 0.2

Keywords

gold sulfur particle physics beryllium production model

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DOI:
10.1103/physrevlett.75.1272
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