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Dielectron production in Ar+KCl collisions at 1.76A GeV
- Source :
- Physical Review C, Physical Review C, American Physical Society, 2011, 84, pp.014902. ⟨10.1103/PhysRevC.84.014902⟩, Physical Review C-Nuclear Physics, Phys.Rev.C Nucl.Phys.
- Publication Year :
- 2011
- Publisher :
- arXiv, 2011.
-
Abstract
- We present results on dielectron production in Ar+KCl collisions at 1.76A GeV. For the first time $\omega$ mesons could be reconstructed in a heavy-ion reaction at a bombarding energy which is well below the production threshold in free nucleon-nucleon collisions. The omega multiplicity has been extracted and compared to the yields of other particles, in particular of the phi meson. At intermediate e+e- invariant masses, we find a strong enhancement of the pair yield over a reference spectrum from elementary nucleon-nucleon reactions suggesting the onset of non-trivial effects of the nuclear medium. Transverse-mass spectra and angular distributions have been reconstructed in three invariant mass bins. In the former unexpectedly large slopes are found for high-mass pairs. The latter, in particular the helicity-angle distributions, are largely consistent with expectations for a pair cocktail dominated at intermediate masses by delta Dalitz decays.<br />Comment: 16 pages, 14 figures, accepted for publication by Phys. Rev. C
- Subjects :
- Nuclear reaction
Physics
Nuclear and High Energy Physics
Particle physics
Meson
ta114
010308 nuclear & particles physics
Hadron
Nuclear Theory
FOS: Physical sciences
Elementary particle
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
01 natural sciences
7. Clean energy
Nuclear physics
Baryon
Antimatter
0103 physical sciences
Invariant mass
Nuclear Experiment (nucl-ex)
010306 general physics
Nucleon
Nuclear Experiment
Subjects
Details
- ISSN :
- 24699985 and 24699993
- Database :
- OpenAIRE
- Journal :
- Physical Review C, Physical Review C, American Physical Society, 2011, 84, pp.014902. ⟨10.1103/PhysRevC.84.014902⟩, Physical Review C-Nuclear Physics, Phys.Rev.C Nucl.Phys.
- Accession number :
- edsair.doi.dedup.....31b6bec9758d840ced39aaee0823f584
- Full Text :
- https://doi.org/10.48550/arxiv.1103.0876