Baryonic resonances close to the Kbar-N threshold: the case of Lambda(1405) in pp collisions
Abstract
We present an analysis of the Lambda(1405) resonance produced in the reaction p+p->Sigmapm+pimp+K+p at 3.5 GeV kinetic beam energy measured with HADES at GSI. The two charged decay channels Lambda(1405) -> Sigma+pi have been reconstructed for the first time in p+p collisions. The efficiency and acceptance-corrected spectral shapes show a peak position clearly below 1400 MeV/c2. We find a total production cross section of sigmaLambda(1405)=9.2 +- 0.9 +- 0.7 +3.3-1.0 mub. The analysis of its polar angle distribution suggests that the Lambda(1405) is produced isotropically in the p-p center of mass system.
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