Low-mass lepton pair production in Pb-Au collisions at 40 A.GeV

The CERES/NA45 experiment at the CERN SPS has previously measurede + e - pair production in 160 A.GeV Pb-Au collisions. In the mass regionm > 02 GeV/c2, an enhancement of 2.7±04(stat.)±0.5(syst.) compared to the expectation from known hadronic decay sources was observed. In the 40 A.GeV data take...

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Hauptverfasser: Adamová, Dagmar (VerfasserIn) , Appelshäuser, Harald (VerfasserIn) , Braun-Munzinger, Peter (VerfasserIn) , Damjanović, Sanja (VerfasserIn) , Dietel, Thomas (VerfasserIn) , Dietrich, Lars (VerfasserIn) , Esumi, ShinIchi (VerfasserIn) , Filimonov, Kirill (VerfasserIn) , Glässel, Peter (VerfasserIn) , Lenkeit, Björn (VerfasserIn) , Milošević, Jovan (VerfasserIn) , Petráček, Vojtech (VerfasserIn) , Richter, Michael (VerfasserIn) , Seipp, Wolfram (VerfasserIn) , Specht, Hans Joachim (VerfasserIn) , Stachel, Johanna (VerfasserIn) , Tilsner, Heinz (VerfasserIn) , Wessels, Johannes P. (VerfasserIn) , Wienold, Thomas (VerfasserIn) , Windelband, Bernd (VerfasserIn) , Yurevich, Sergey (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 2003
In: Pramāna
Year: 2003, Jahrgang: 60, Heft: 5, Pages: 1067-1072
ISSN:0973-7111
DOI:10.1007/BF02707032
Online-Zugang:Verlag, kostenfrei, Volltext: http://dx.doi.org/10.1007/BF02707032
Verlag, kostenfrei, Volltext: https://link.springer.com/article/10.1007/BF02707032
Volltext
Verfasserangaben:Sanja Damjanović ́, for the CERES/NA45 Collaboration: D. Adamová, G. Agakichiev, H. Appelshäuser, V. Belaga, P. Braun-Munzinger, A. Cherlin, S. Damjanović, T. Dietel, L. Dietrich, A. Drees, S. I. Esumi, K. Filimonov, K. Fomenko, Z. Fraenkel, C. Garabatos, P. Glässel, G. Hering, J. Holeczek, V. Kushpil, B. Lenkeit, A. Maas, A. Marín, J. Milosević, A. Milov, D. Miśkowiec, Y. Panebrattsev, O. Petchenova, V. Petrácek, A. Pfeiffer, J. Rak, I. Ravinovich, P. Rehak, M. Richter, H. Sako, W. Schmitz, J. Schukraft, S. Sedykh, W. Seipp, S. Shimansky, J. Slívová, H. J. Specht, J. Stachel, M. Sumbera, H. Tilsner, I. Tserruya, J. P. Wessels, T. Wienold, B. Windelband, J. P. Wurm, W. Xie, S. Yurevich, and V. Yurevich

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520 |a The CERES/NA45 experiment at the CERN SPS has previously measurede + e - pair production in 160 A.GeV Pb-Au collisions. In the mass regionm > 02 GeV/c2, an enhancement of 2.7±04(stat.)±0.5(syst.) compared to the expectation from known hadronic decay sources was observed. In the 40 A.GeV data taken in 1999, an enhancement is again found; a preliminary analysis gives an even larger value of 50 ±13(stat.). The results are compared to theoretical model calculations based on π+π- annihilation with a modified ρ-propagator; they may be related to chiral symmetry restoration. 
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