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Physical Review C 85 (2012) 035203
Baryonic resonances close to the (K)over-bar N threshold: The case of Sigma(1385)(+) in pp collisions
G. Agakishiev, J. L. Boyard1, T. Hennino1, T. Liu1, E. Morinière1, B. Ramstein1
HADES Collaboration(s)

We present results of an exclusive measurement of the first-excited state of the Σ hyperon, Σ(1385)+, produced in p+p→Σ++K++n at 3.5 GeV beam energy. The extracted data allow the detailed study of the invariant mass distribution of the Σ(1385)+. The mass distribution is well described by a relativistic Breit-Wigner function with a maximum at m0=1383.2±0.9 MeV/c2 and a width of 40.2±2.1 MeV/c2. The exclusive production cross section comes out to be 22.27±0.89±1.56−2.10+3.07 μb. Angular distributions of the Σ(1385)+ in different reference frames are found to be compatible with the hypothesis that 33% of Σ(1385)+ result from the decay of an intermediate broad Δ++ excitation at about 2000 MeV/c2.
1 :  IPNO - Institut de Physique Nucléaire d'Orsay
Physique/Physique Nucléaire Expérimentale