First results from CERES/NA45 on low-mass electron pair production in PbAu collisions
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First results from CERES/NA45 on low-mass electron pair production in PbAu collisions

Th. Ullrich,G. Agakichiev,R. Baur,P. Braun-Munzinger,F. Ceretto,A. Drees,S. Esumi,U. Faschingbauer,Ch. Fuchs,E. Gatti,P. Glässel,C.P. De Los Heros,P. Holl,Ch. Jung,H. Kraner,B. Lenkeit,M. Messer,Y. Minaev,Y. Panebrattsev,A. Pfeiffer,J. Rak,I. Ravinovich,S. Razin,P. Rehak,M. Sampietro,J. Schukraft,S. Shimanskiy,E. Socol,H.J. Specht,J. Stachel,G. Tel-Zur,I. Tserruya,C. Voigt,C. Weber,J.P. Wessels,J.P. Wurm,V. Yurevich,CERES Collaboration;Th. Ullrich;G. Agakichiev;R. Baur;P. Braun-Munzinger;F. Ceretto;A. Drees;S. Esumi;U. Faschingbauer;Ch. Fuchs;E. Gatti;P. Glässel;C.P. De Los Heros;P. Holl;Ch. Jung;H. Kraner;B. Lenkeit;M. Messer;Y. Minaev;Y. Panebrattsev;A. Pfeiffer;J. Rak;I. Ravinovich;S. Razin;P. Rehak;M. Sampietro;J. Schukraft;S. Shimanskiy;E. Socol;H.J. Specht;J. Stachel;G. Tel-Zur;I. Tserruya;C. Voigt;C. Weber;J.P. Wessels;J.P. Wurm;V. Yurevich;CERES Collaboration;
nuclear physics a 1996 Vol. 610 pp. 317-330
116
collaboration1996nuclearfirst

Abstract

We report preliminary results of the first measurement of low-mass electron pairs in 160 GeV/nucleon PbAu collisions at central rapidities in a wide multiplicity range. This work is the continuation of our systematic studies on pair production in p-Be, p-Au and SAu interactions. The motivation for this effort derives from a new source of lowmass dileptons recently observed in SAu and S-W collisions by CERES and HELIOS/3, respectively. The results obtained in the analysis of the PbAu data confirm our previous finding that pair production in the mass range 0.2 < mee < 1.5 GeV/c2 is enhanced over the contributions from hadron decays while no significant excess could be observed for mee ≲ 2mπ. A comparison of the results for different multiplicity bins favours a non-linear dependence of the e+e−-yield on the accompanying charged particle densities.

Keywords

pair production au collisions mass electron electron pair low mass results from ceres/na45

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DOI:
10.1016/s0375-9474(96)00366-1
URL:
https://sciprofiles.com/publication/view/3f6a13823...

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