Enhanced production of low-mass electron-positron pairs in 40-AGeV Pb-Au collisions at the CERN SPS -: art. no. 042301

被引：144
作者：
Adamová, D
Agakichiev, G
Appelshäuser, H
Belaga, V
Braun-Munzinger, P
Cherlin, A
Damjanovic, S
Dietel, T
Dietrich, L
Drees, A
Esumi, SI
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, Y
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, HJ
Stachel, J
Sumbera, M
Tilsner, H
Tserruya, I
Wessels, JP
Wienold, T
Windelband, B
Wurm, JP
Xie, W
机构：
[1] NPI ASCR, Rez, Czech Republic
[2] GSI Darmstadt, D-64220 Darmstadt, Germany
[3] Heidelberg Univ, Inst Phys, D-69120 Heidelberg, Germany
[4] JINR, Dubna, Russia
[5] Weizmann Inst Sci, IL-76100 Rehovot, Israel
[6] SUNY Stony Brook, Stony Brook, NY 11794 USA
[7] CERN, CH-1211 Geneva 23, Switzerland
[8] Brookhaven Natl Lab, Upton, NY 11973 USA
[9] Max Planck Inst Kernphys, D-69117 Heidelberg, Germany
来源：
PHYSICAL REVIEW LETTERS | 2003年 / 91卷 / 04期
关键词：
D O I：
10.1103/PhysRevLett.91.042301
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
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<mless than or equal to1 GeV/c(2) 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 pi(+)pi(-)-->e(+)e(-) annihilation with a modified rho propagator. They may be linked to chiral symmetry restoration and support the notion that the in-medium modifications of the rho are more driven by baryon density than by temperature.
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