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Baryonic resonances close to the K̅ N threshold: The case of Λ(1405) in pp collisions

Abstract : We present an analysis of the Λ(1405) resonance produced in the reaction p+p→Σ±+π∓+K++p at 3.5 GeV kinetic beam energy measured with the High Acceptance Dielectron Spectrometer (HADES) at the Gesellschaft für Schwerionenforschung (GSI). The two charged decay channels Λ(1405)→Σ±π∓ 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 σΛ(1405)=9.2±0.9±0.7−1.0+3.3 μb. The analysis of its polar angle distribution suggests that the Λ(1405) is produced isotropically in the p−p center-of-mass system (CMS).
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http://hal.in2p3.fr/in2p3-00817075
Contributor : Sophie Heurteau <>
Submitted on : Tuesday, April 23, 2013 - 4:46:41 PM
Last modification on : Wednesday, September 16, 2020 - 4:07:55 PM

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M. Gumberidze, G. Agakishiev, J. L. Boyard, T. Hennino, H. Kuc, et al.. Baryonic resonances close to the K̅ N threshold: The case of Λ(1405) in pp collisions. Physical Review C, American Physical Society, 2013, 87, pp.025201. ⟨10.1103/PhysRevC.87.025201⟩. ⟨in2p3-00817075⟩

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