Inclusive dielectron spectra in p plus p collisions at 3.5 GeV kinetic beam energy - IN2P3 - Institut national de physique nucléaire et de physique des particules
Article Dans Une Revue The European physical journal. A, Hadrons and Nuclei Année : 2012

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

Résumé

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.

Dates et versions

in2p3-00714011 , version 1 (03-07-2012)

Identifiants

Citer

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. The European physical journal. A, Hadrons and Nuclei, 2012, 48, pp.64. ⟨10.1140/epja/i2012-12064-y⟩. ⟨in2p3-00714011⟩
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