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          Institute: MPI für Kernphysik     Collection: Nuclear Physics and Nuclear Probes     Display Documents

ID: 63056.0, MPI für Kernphysik / Nuclear Physics and Nuclear Probes
Enhanced Production of Low-Mass Electron-Positron Pairs in 40-AGeV Pb-Au Collisions at the CERN SPS
Authors:Adamová, D.; Agakichiev, G.; Appelshäuser, H.; Belaga, V.; Braun-Munzinger, P.; Cherlin, A.; Damjanovic, S.; Dietel, T.; Dietrich, L.; Drees, A.; Esumi, S.I.; Filimonov, K.; Fomenko, K.; Fraenkel, Z.; Garabatos, C.; Glässel, P.; Hering, G.; Holeczek, J.; Kushpil, V.; Lenkeit, B.; Maas, A.; Marín, A.; Milosevic, J.; Milov, A.; Miskowiec, D.; Panebrattsev, Yu.; Petchenova, O.; Petrácek, V.; Pfeiffer, A.; Rak, J.; Ravinovich, I.; Rehak, P.; Richter, M.; Sako, H.; Schmitz, W.; Sedykh, S.; Seipp, W.; Sharma, A.; Shimansky, S.; Slívová, J.; Specht, H. J.; Stachel, J.; Sumbera, M.; Tilsner, H.; Tserruya, I.; Wessels, J. P.; Wienold, T.; Windelband, B.; Wurm, J. P.; Xie, W.; Yurevich, S.; Yurevich, V.
Research Context:CERES/NA45 Collaboration
Date of Publication (YYYY-MM-DD):2003-07-25
Title of Journal:Physical Review Letters
Journal Abbrev.:Phys. Rev. Lett.
Issue / Number:4
Start Page:1
End Page:5
Sequence Number of Article:042301
Copyright:©2003 The American Physical Society
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We report on first measurements of low-mass electron-positron pairs in Pb-Au collisions at the CERN SPS beam energy of 40 AGeV. The observed pair yield integrated over the range of invariant masses 0.2<m1 GeV/c2 is enhanced over the expectation from neutral meson decays by a factor of 5.9±1.5(stat)±1.2(syst data)±1.8(syst meson decays), somewhat larger than previously observed at the higher energy of 158 AGeV. The results are discussed with reference to model calculations based on +–e+e– annihilation with a modified propagator. They may be linked to chiral symmetry restoration and support the notion that the in-medium modifications of the are more driven by baryon density than by temperature.
Free Keywords:Nuclear Reactions
External Publication Status:published
Document Type:Article
Affiliations:MPI für Kernphysik/Group W. Hofmann/High-Energy Heavy Ion Physics (J.-P. Wurm)
External Affiliations:1NPI ASCR, e, Czech Republic
2GSI, 64220 Darmstadt, Germany
3Physikalisches Institut der Universität Heidelberg, 69120 Heidelberg, Germany
4JINR, Dubna, Russia
5Weizmann Institute, Rehovot 76100, Israel
6State University of New York at Stony Brook, Stony Brook, New York 11794, USA
7CERN, 1211 Geneva 23, Switzerland
8Brookhaven National Laboratory, Upton, New York 11973, USA
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