| 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 title | SUPER PROTON SYNCHROTRON |
| Author(s) |
Agakichiev, G. (Dubna, JINR) ; Baur, R. (Heidelberg U.) ; Braun-Munzinger, P. (Darmstadt, GSI) ; Ceretto, F. (Heidelberg, Max Planck Inst.) ; Drees, A. (Heidelberg U.) ; Esumi, S. (Heidelberg U.) ; Faschingbauer, U. (Heidelberg U. ; Heidelberg, Max Planck Inst.) ; Fraenkel, Z. (Weizmann Inst.) ; Fuchs, Ch. (Heidelberg, Max Planck Inst.) ; Gatti, E. (Milan Polytechnic) ; Glässel, P. (Heidelberg U.) ; de los Heros, C.P. (Weizmann Inst.) ; Holl, P. (Brookhaven Natl. Lab.) ; Jung, Ch. (Heidelberg U.) ; Lenkeit, B. (Heidelberg U.) ; Messer, M. (Heidelberg U.) ; Panebrattsev, Y. (Dubna, JINR) ; Pfeiffer, A. (Heidelberg U.) ; Rak, J. (Heidelberg, Max Planck Inst.) ; Ravinovich, I. (Weizmann Inst.) ; Razin, S. (Dubna, JINR) ; Rehak, P. (Brookhaven Natl. Lab.) ; Richter, M. (Heidelberg U.) ; Sampietro, M. (Milan Polytechnic) ; Saveljic, N. (Dubna, JINR) ; Schukraft, J. (CERN) ; Shimansky, S. (Dubna, JINR) ; Seipp, W. (Heidelberg U.) ; Socol, E. (Weizmann Inst.) ; Specht, H.J. (Heidelberg U.) ; Stachel, J. (Heidelberg U.) ; Tel-Zur, G. (Weizmann Inst.) ; Tserruya, I. (Weizmann Inst.) ; Ullrich, T. (Heidelberg U.) ; Voigt, C. (Heidelberg U.) ; Weber, C. (Heidelberg U.) ; Wessels, J.P. (Heidelberg U.) ; Wienold, T. (Heidelberg U.) ; Wurm, J.P. (Heidelberg, Max Planck Inst.) ; Yurevich, V. (Dubna, JINR) |
| 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. |
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Zapis kreiran 1998-08-21, zadnja izmjena 2024-05-08
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