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Low-mass $e^{+}e^{-}$ pair production in 158 A GeV Pb - Au collisions at the CERN SPS, its dependence on multiplicity and transverse momentum
We report a measurement of low-mass electron pairsobserved 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 observe...
Autores principales: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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Lenguaje: | eng |
Publicado: |
1998
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Materias: | |
Acceso en línea: | https://dx.doi.org/10.1016/S0370-2693(98)00083-5 http://cds.cern.ch/record/362780 |