Multipion and Strange-Particle Photoproduction on Protons at Energies up to 5.8 GeV

Abstract

In a study of photoproduction at photon energies between 0.3 and 5.8 GeV in a hydrogen bubble chamber, approximately 1.7 million pictures containing about 31 000 events with three or more outgoing charged particles were analyzed. This is the second of two final reports on this experiment. Distributions of effective masses are given for the reactions yp -> N3ir, N4TT, N57r. Cross sections for the production of A (1236) and p via yp -> Ap, A2ir, A37r, A47r, Nirp, and N2irp and of various other reactions are reported. From the reaction yp -» A ++ p~, an upper limit for the radiative decay width of p~, r(p~ -• > ir~~y) <0.24 MeV, is obtained (90% confidence). For the four-pion decay mode of the p°, an upper limit of r (p° -> 7r + 7r + 7r~7r~)/T(p° -» ir + ir~) <0.0015 is found (90% confidence). The photoproduction of strange particles is discussed and cross sections for yp -> AK + , 2K, AKTT, XKTT, and KK-KTV are presented. Production of 2 (1385) was observed.

Nucleon and Δ resonances in γp→K+Σ0(1385Wang1, Wang2, Huang3 2020Phys. Rev. D

“…Experimentally, in 1970's there were limited experimental data with large error bars on total cross sections for γp → K + Σ 0 (1385) [4][5][6]. In 2013, the differential cross-section data for γp → K + Σ 0 (1385) became available in the range of center-of-mass energy W ≈ 2.0 ∼ 2.8 GeV from the CLAS Collaboration at the Thomas Jefferson National Accelerator Facility [7].…”

Differential photoproduction cross sections of theΣ0(1385),Λ(1405), andMoriya1, Schumacher2, Adhikari3 et al. 2013Phys. Rev. C

“…For photoproduction of the Σ 0 (1385) on the proton there are total cross section measurements from bubble chamber work by the ABBHHM group [5,6] and by the CEA group [7]. Preliminary results from CLAS have been presented [8], but the present analysis is independent of that study, albeit using the same raw data set.…”

“…For comparison, we see good agreement between these results and the much coarser, early bubble chamber data of Refs. [5][6][7]. The solid black curve is due to the calculation of Oh [37], and again there is very good agreement at the higher energies, but there is some disagreement in the region of 2.0 ≤ E γ ≤ 2.5 GeV.…”

“…The four dark brown square data points with cross-like error bars are bubble chamber data from Refs. [5][6][7]. The solid black curve shows the model of Ref.…”