Investigation of the Σ.sup.0./sup. Production Mechanism in p(3.5 GeV)+p Collisions

0583170 - ÚJF 2025 RIV US eng J - Journal Article
Abou Yassine, R. - Arnold, O. - Becker, M. - Bergmann, P. - Chlad, Lukáš - Chudoba, Petr - Kugler, Andrej - Prozorov, Alexandr P. - Svoboda, Ondřej - Tlustý, Pavel - Wagner, Vladimír … Total 91 authors
Investigation of the Σ⁰ Production Mechanism in p(3.5 GeV)+p Collisions.
European Physical Journal A. Roč. 60, č. 1 (2024), č. článku 18. ISSN 1434-6001. E-ISSN 1434-601X
R&D Projects: GA MŠMT LTT17003; GA MŠMT EF18_046/0016066
Research Infrastructure: FAIR-CZ III - 90260
Institutional support: RVO:61389005
Keywords : HADES * Lambda-hyperon production * proton-proton collisions
OECD category: Particles and field physics
Impact factor: 2.6, year: 2022
Method of publishing: Open access
https://doi.org/10.1140/epja/s10050-023-01214-1

The production of Σ hyperons in proton proton collisions at a beam kinetic energy of 3.5 GeV impinging on a liquid hydrogen target was investigated using data collected with the HADES setup. The total production cross section is found to be σ(pK+Σ) = 17.7 ± 1.7 (stat) ± 1.6 (syst) µb. Differential cross section distributions of the exclusive channel pp→ pK+Σ were analyzed in the center-of-mass, Gottfried–Jackson and helicity reference frames for the first time at the excess energy of 556 MeV. The data support the interplay between pion and kaon exchange mechanisms and clearly demonstrate the contribution of interfering nucleon resonances decaying to K +Σ . The Bonn–Gatchina partial wave analysis was employed to analyse the data. Due to the limited statistics, it was not possible to obtain an unambiguous determination of the relative contribution of intermediate nucleon resonances to the final state. However nucleon resonances with masses around 1.710 GeV / c 2 (N ∗(1710)) and 1.900 GeV / c 2 (N ∗(1900) or Δ ∗(1900)) are preferred by the fit.
Permanent Link: https://hdl.handle.net/11104/0351166