Contribution of π0 and η Dalitz decays to the dilepton invariant-mass spectrum in 1A GeV heavy-ion collisions

被引：25

作者：

Holzmann, R ^{[1
]}

Appenheimer, M

Averbeck, R

Charbonnier, Y

Delagrange, H

Diaz, J

Doppenschmidt, A

Hejny, V

Hlavac, S

Kugler, A

Lefevre, F

Lohner, H

Marin, A

Martinez, G

Matulewicz, T

Metag, V

Novotny, R

Ostendorf, RW

Pleskac, R

Schutz, Y

Siemssen, RH

Simon, RS

Stroher, H

Tlusty, P

Vogt, PH

Wagner, V

Weiss, J

Wilschut, HW

Wissmann, F

Wolf, AR

Wolf, M

机构：

[1] Gesell Schwerionenforsch mbH, D-64220 Darmstadt, Germany

[2] Univ Giessen, Inst Phys 2, D-35392 Giessen, Germany

[3] Grand Accelerateur Natl Ions Lourds, F-14076 Caen 5, France

[4] Inst Fis Corpuscular, SP-46100 Burjassot, Valencia, Spain

[5] Goethe Univ Frankfurt, Inst Kernphys, D-60486 Frankfurt, Germany

[6] Inst Nucl Phys, CZ-25086 Rez, Czech Republic

[7] Kernfys Versneller Inst, NL-9747 AA Groningen, Netherlands

来源：

PHYSICAL REVIEW C | 1997年 / 56卷 / 06期

关键词：

D O I：

10.1103/PhysRevC.56.R2920

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

The Dalitz-decay contributions of pi(0) and eta mesons to the di-electron invariant-mass spectrum at 1A GeV have been obtained from a systematics of inclusive meson production cross sections measured for the collision systems C-12 + C-nat and Ar-40, Ca-40 + Ca-nat in the bombarding-energy range of 0.8-2.0 A GeV. These results are compared with the recently published di-electron mass spectra of the DLS collaboration. Systematic errors and angular-distribution effects are discussed. We conclude that the low-mass part of the DLS data cannot be explained by the Dalitz decays of light neutral mesons only.

引用

页码：R2920 / R2923

页数：4

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