7 N ov 2 00 7 Study of dielectron production in C + C collisions at 1 AGeV
نویسندگان
چکیده
The emission of ee pairs from C+C collisions at an incident energy of 1 GeV per nucleon has been investigated. The measured production probabilities, spanning from the π-Dalitz to the ρ/ω 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.
منابع مشابه
M ar 2 00 8 Study of dielectron production in C + C collisions at 1 AGeV HADES Collaboration
The emission of ee pairs from C+C collisions at an incident energy of 1 GeV per nucleon has been investigated. The measured production probabilities, spanning from the π-Dalitz to the ρ/ω 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 prod...
متن کاملDielectron production in C+C and pp collisions
In the previous annual report [1], preliminary dielectron invariant-mass distributions from C+C collisions at 2 AGeV were reported on. Here we present results from a more refi ned data analysis using better detector calibrations and improved pair reconstruction algorithms. A comparison of the measured invariant-mass distribution to predictions of a thermal cocktail based on the PLUTO event gene...
متن کاملDielectron production in C+C and pp collisions
In 2004 the HADES collaboration concentrated on completing the first experimental proposal S262 focused on dielectron production in C+C and pp collisions. Two dedicated production runs using carbon and proton beams of 1 AGeV and 2.2 AGeV kinetic energy, respectively, were successfully conducted. Based on experiences gained in a first commissioning run using the liquid hydrogen target built at O...
متن کاملar X iv : n uc l - th / 0 41 20 37 v 2 7 M ar 2 00 5 Transport Theories for Heavy Ion Collisions in the 1 AGeV Regime
We compare multiplicities as well as rapidity and transverse momentum distributions of protons, pions and kaons calculated within presently available transport approaches for heavy ion collisions around 1 AGeV. For this purpose, three reactions have been selected: Au+Au at 1 and 1.48 AGeV and Ni+Ni at 1.93 AGeV.
متن کامل1 4 Fe b 20 08 Study of dielectron production in C + C collisions at 1 AGeV HADES Collaboration
The emission of ee pairs from C+C collisions at an incident energy of 1 GeV per nucleon has been investigated. The measured production probabilities, spanning from the π-Dalitz to the ρ/ω 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 prod...
متن کامل