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.

引用

页数：5

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