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Baryonic resonances close to the Kbar-N threshold: the case of Sigma(1385)^+ in pp collisions

Abstract : We present results of an exclusive measurement of the first excited state of the Sigma hyperon, Sigma(1385)^+, produced in p+p -> Sigma^+ + K^+ + n at 3.5 GeV beam energy. The extracted data allow to study in detail the invariant mass distribution of the Sigma(1385)^+. The mass distribution is well described by a relativistic Breit-Wigner function with a maximum at m_0 = 1383.2 +- 0.9 MeV/c^2 and a width of 40.2 +- 2.1 MeV/c^2. The exclusive production cross-section comes out to be 22.27 +- 0.89 +- 1.56 +3.07 -2.10 mu b. Angular distributions of the Sigma(1385)^+ in different reference frames are found to be compatible with the hypothesis that 33 % of Sigma(1385)^+ result from the decay of an intermediate Delta^{++} resonance.
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http://hal.in2p3.fr/in2p3-00638713
Contributor : Sophie Heurteau <>
Submitted on : Monday, November 7, 2011 - 10:57:15 AM
Last modification on : Wednesday, September 16, 2020 - 4:08:10 PM

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G. Agakishiev, A. Balanda, D. Belver, A. V. Belyaev, A. Blanco, et al.. Baryonic resonances close to the Kbar-N threshold: the case of Sigma(1385)^+ in pp collisions. Physical Review C, American Physical Society, 2012, 85, pp.035203. ⟨10.1103/PhysRevC.85.035203⟩. ⟨in2p3-00638713⟩

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