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Inclusive dielectron spectra in p plus p collisions at 3.5 GeV kinetic beam energy

Abstract : We present the inclusive invariant mass, transverse momentum and rapidity distributions of dielectrons (e+e- pairs) in p+p interactions at 3.5GeV beam kinetic energy. In the vector meson mass region, a distinct peak corresponding to direct ω decays is reconstructed with a 2% mass resolution. The data is compared to predictions from three model calculations. Due to the large acceptance of the HADES apparatus for e+e- invariant masses above 0.2 GeV/c 2 and for transverse pair momenta p t < 1 GeV/c, acceptance corrections are, to a large extent, model independent. This allows us to extract from dielectron data for the first time at this energy the inclusive production cross-sections for light vector mesons. Inclusive production cross-sections for π0 and η mesons are also reported. The obtained results will serve as an important reference for the study of vector meson production in proton-nucleus and heavy-ion collisions. Furthermore, using this data, an improved value for the upper bound of the branching ratio for direct η decays into the electron-positron channel is obtained.
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Contributor : Sophie Heurteau <>
Submitted on : Tuesday, July 3, 2012 - 11:22:22 AM
Last modification on : Wednesday, September 16, 2020 - 4:07:54 PM

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G. Agakishiev, J. L. Boyard, M. Gumberidze, T. Hennino, E. Morinière, et al.. Inclusive dielectron spectra in p plus p collisions at 3.5 GeV kinetic beam energy. European Physical Journal A, EDP Sciences, 2012, 48, pp.64. ⟨10.1140/epja/i2012-12064-y⟩. ⟨in2p3-00714011⟩



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