CERN Accelerating science

Article
Report number nucl-ex/9712008
Title Low-mass e+e pair production in 158 A GeV Pb - Au collisions at the CERN SPS, its dependence on multiplicity and transverse momentum
Related titleSUPER PROTON SYNCHROTRON
Author(s) NA45 Collaboration  Visa alla 40 författare
Affiliation (CERN)
Publication 1998
Imprint 1997-12
Number of pages 12
Note 17 pages, 4 figures, submitted to Phys.Lett.B
In: Phys. Lett. B 422 (1998) 405-412
DOI 10.1016/S0370-2693(98)00083-5
Subject category Particle Physics - Experiment
Accelerator/Facility, Experiment CERN SPS ; CERES NA45
Abstract We report a measurement of low-mass electron pairs observed in 158 GeV/nucleon Pb-Au collisions. The pair yield integrated over the range of invariant masses 0.2 < m < 2.0 GeV is enhanced by a factor of 3.5 +/- 0.4 (stat) +/- 0.9 (syst) over the expectation from neutral meson decays. As observed previously in S-Au collisions, the enhancement is most pronounced in the invariant-mass region 300-700 MeV. For Pb-Au we find evidence for a strong increase of the enhancement with centrality. In addition, we show that the enhancement covers a wide range in transverse momentum, but is largest at the lowest observed pt.
Copyright/License Copyright @ unknown. Published by Elsevier B.V.

Corresponding record in: Inspire
Email contact: drees@skipper.physics.sunysb.edu


 Journalen skapades 1998-08-21, och modifierades senast 2024-05-08


Fulltext:
Download fulltextPDF
External link:
Download fulltextFulltext
  • Send to ScienceWise.info