The pK0Σ+ final state in proton-proton collisions

Abstract

Abstract. This paper reports results from a study of the reaction pp → pK 0 Σ + at beam momenta of p beam = 2950, 3059, and 3200 MeV/c (excess energies of ǫ = 126, 161, and 206 MeV). Total cross sections were determined for all energies; a set of differential cross sections (Dalitz plots; invariant mass spectra of all two-body subsystems; angular distributions of all final state particles; distributions in helicity and Jackson frames) are presented for ǫ = 161 MeV. The total cross sections are proportional to the volume of available three-body phase-space indicating that the transition matrix element does not change significantly in this range of excess energies. It is concluded from the differential data that the reaction proceeds dominantly via the N (1710)P11 and/or N (1720)P13 resonance(s); N (1650)S11 and ∆(1600)P33 could also contribute. PACS. 13.75.Cs Nucleon-nucleon interactions -13.75.-n Hadron-induced low-and intermediate-energy reactions and scattering (energy ≤ 10 GeV) -13.75.Ev Hyperon-nucleon interactions -25.40.Ve Other reactions above meson production thresholds (energies > 400 MeV)

AssociateK0production inp+pcollisions at 3.5 GeV: The role ofΔ(1232)Agakishiev1, Belver2, Belyaev3 et al. 2014Phys. Rev. CSelf Cite19140View full textAdd to dashboardCite

“…2, 3 and 6. phase-space. A similar observation was made in the study of the 3-body reactions p + p → p + K + + Λ/Σ 0 at p beam = 3059 MeV/c by the COSY-TOF collaboration, where an opposite behavior of the angular distributions was found depending on the hyperon content [7]. This points to different production mechanisms involving intermediate resonances to create either a ΛK-pair or a Σ 0 K-pair.…”

“…Hence, two measured angular distributions have been included and a method has been developed to determine the strength of the anisotropy for the two ∆ ++ reactions. In the simulation the Σ + + p + K 0 final states have been weighted such that the angular distribution of the K 0 's reproduces the one reported in [7] which has been extracted for p beam = 3059 MeV/c. The angular distribution for the channel p + p → Σ(1385) + + n + K + has been extracted from [1] and employed to weight the reaction p + p → Σ(1385) + + p + K 0 .…”

“…Coefficients of the Legendre polynomials included for the angular distributions of the listed particles in the corresponding reactions in [µb]. Coefficients of channel p + p → Σ + + p + K 0 are taken from [7]. The coefficients for p + p → Σ(1385) + + p + K 0 was assumed to be the same as found in [1] for the reaction p + p → Σ(1385 III include an anisotropic angular distribution, while σisotropic means, that all channels were simulated isotropic.…”

“…The production of strangeness in 3-body final states (p + p → p + Y + K), where Y stands for a Σ-or a Λhyperon, was studied in detail for a wide range of energies up to 2 GeV both from the experimental and the theoretical sides [4][5][6][7][8]. Inclusive cross-sections of the 3body final states including Σ-and Λ-hyperons have been measured accurately but so far no conclusive picture was drawn that was able to explain the role of intermediate N * resonances decaying into Λ-kaon pairs to the final states.…”

Medium effects in proton-inducedK0production at 3.5 GeV

“…In order to fit our inclusive spectra and, at the same time be consistent with reported measurements at other energies, the cross section of this channel and the channel p + p → ++ (1232) + 0 + K 0 should be scaled by factors of 0.42 and 0.72, respectively. Similarly, the parametrizations given by the resonance model overestimate the data for the three-body channel p + p → + + p + K 0 in the region √ s = 2.57-2.83 GeV [36] by a factor of ≈1.5. The cross section of this channel has been scaled down accordingly.…”