Title of article
Low-mass e+e− pair production in 158 A GeV Pb-Au collisions at the CERN SPS, its dependence on multiplicity and transverse momentum
Author/Authors
CERES Collaboration، نويسنده , , G. Agakichiev، نويسنده , , R. Baur، نويسنده , , P. Braun-Munzinger، نويسنده , , F. Ceretto، نويسنده , , A. Drees، نويسنده , , S. Esumi، نويسنده , , U. Faschingbauer، نويسنده , , Z. Fraenkel، نويسنده , , Paul Ch. Fuchs، نويسنده , , E. Gatti، نويسنده , , P. Gl?ssel، نويسنده , , C.P. de los Heros، نويسنده , , Martin P. Holl، نويسنده , , C.H. Jung، نويسنده , , B. Lenkeit، نويسنده , , Julia M. Messer، نويسنده , , Y. Panebrattsev، نويسنده , , A. Pfeiffer، نويسنده , , J. Rak، نويسنده , , et al.، نويسنده ,
Issue Information
روزنامه با شماره پیاپی سال 1998
Pages
8
From page
405
To page
412
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/c2 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/c2. 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 p⊥.
Journal title
PHYSICS LETTERS B
Serial Year
1998
Journal title
PHYSICS LETTERS B
Record number
909534
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