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We present the inclusive di‐electron invariant‐mass spectrum from p+p interactions at 3.5 GeV kinetic beam energy. It is a very important reference for the study of vector meson production off the nucleus, recently investigated by HADES in p+93Nb reactions at the same beam energy. Up to invariant masses of 0.6 GeV/c2 the main contributions to the e+e− spectrum are π0, η, ω and Δ Dalitz decays. In the vector‐meson region a clear peak corresponding to the ω direct decay is reconstructed with ≈2% mass resolution. Subtracting this peak from the spectrum allows to investigate additional sources, in particular the ρ meson. Indeed, the latest results from HSD and UrQMD calculations show different distributions for the shape of the ρ meson at these energies. Therefore it is important to experimentally understand the production mechanism of the ρ meson in elementary reactions. Besides the spectral shape of the mesons, their inclusive production cross sections are also not known at these energies. Due to the large ...

Inclusive meson production in 3.5 GeV pp collisions studied with the HADES spectrometer