Abstract
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 3.5GeV 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 m 0=1383.2±0.9MeV/c2 and a width of 40.2±2.1MeV/c2. The exclusive production cross section comes out to be 22.27±0.89±1. 56-2.10+3.07μb. 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 2000MeV/c2.
Original language | English |
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Article number | 035203 |
Journal | Physical Review C - Nuclear Physics |
Volume | 85 |
Issue number | 3 |
DOIs | |
State | Published - 14 Mar 2012 |
Externally published | Yes |