Study of dielectron production in C+C collisions at 1 AGeV

HADES Collaboration: G. Agakishiev; C. Agodi; H. Alvarez Pol; A.; Balanda; R. Bassini; G. Bellia; D. Belver; A. Belyaev; A. Blanco; M. Boehmer,; A. Bortolotti; J. L. Boyard; P. Braun-Munzinger; P. Cabanelas; E. Castro; T.; Christ; M. Destefanis; J. Diaz; F. Dohrmann; A. Dybczak; T. Eberl; L.; Fabbietti; P. Finocchiaro; P. Fonte; J. Friese; I. Froehlich; T. Galatyuk; J.; A. Garzon; R. Gernhaeuser; A. Gil; C. Gilardi; M. Golubeva; D. Gonzalez Diaz,; E. Grosse; F. Guber; M. Heilmann; T. Hennino; R. Holzmann; A. Ierusalimov; I.; Iori; A. Ivashkin; M. Jurkovic; B. Kaempfer; K. Kanaki; T. Karavicheva; D.; Kirschner; I. Koenig; W. Koenig; B. W. Kolb; R. Kotte; A. Kozuch; A. Krasa,; F. Krizek; R. Kruecken; W. Kuehn; A. Kugler; A. Kurepin; J. Lamas Valverde,; S. Lang; J. S. Lange; K. Lapidus; L. Lopes; L. Maier; A. Mangiarotti; J.; Marin; J. Markert; V. Metag; B. Michalska; D. Mishra; E. Moriniere; J. Mousa,; M. Muench; C. Muentz; L. Naumann; R. Novotny; J. Otwinowski; Y. C. Pachmayer,; M. Palka; Y. Parpottas; V. Pechenov; O. Pechenova; T. Perez; J. Pietraszko,; R. Pleskac; W. Przygoda; B. Ramstein; A. Reshetin; M. Roy Stephan; A.; Rustamov; A. Sadovsky; B. Sailer; P. Salabura; A. Schmah; R. Simon; Y.; Sobolev; S. Spataro; B. Spruck; H. Stroebele; J. Stroth; C. Sturm; M. Sudol,; A. Tarantola; K. Teilab; P. Tlusty; A. Toia; M. Traxler; R. Trebacz; H.; Tsertos; I. Veretenkin; V. Wagner; M. Weber; H. Wen; M. Wisniowski; T.; Wojcik; J. Wuestenfeld; S. Yurevich; Y. Zanevsky; P. Zhou; P. Zumbruch

arXiv:0711.4281·nucl-ex·November 26, 2008

Study of dielectron production in C+C collisions at 1 AGeV

HADES Collaboration: G. Agakishiev, C. Agodi, H. Alvarez Pol, A., Balanda, R. Bassini, G. Bellia, D. Belver, A. Belyaev, A. Blanco, M. Boehmer,, A. Bortolotti, J. L. Boyard, P. Braun-Munzinger, P. Cabanelas, E. Castro, T., Christ, M. Destefanis, J. Diaz, F. Dohrmann, A. Dybczak

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TL;DR

This study investigates dielectron production in C+C collisions at 1 AGeV, revealing an excess over standard sources that scales with pion production and aligns with previous DLS results.

Contribution

It provides new measurements of dielectron emission at 1 AGeV and demonstrates the excess scales with pion production, confirming earlier findings.

Findings

01

Strong excess of dielectron pairs above standard hadronic sources

02

Excess scales with pion production rather than eta production

03

Results agree with previous DLS experiment data

Abstract

The emission of e+e- pairs from C+C collisions at an incident energy of 1 GeV per nucleon has been investigated. The measured production probabilities, spanning from the pi0-Dalitz to the rho/omega! invariant-mass region, display a strong excess above the cocktail of standard hadronic sources. The bombarding-energy dependence of this excess is found to scale like pion production, rather than like eta production. The data are in good agreement with results obtained in the former DLS experiment.

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