We have studied photoproduction using a 1 m streamer chamber at DESY and a tagged photon beam with an energy range of 1.6 GeV < E γ < 6.3 GeV. We analysed approximately 30 000 events and report topological, channel and resonance production cross sections for a large number of reactions with three and five outgoing charged particles.
CHANNEL CROSS SECTIONS FOR 3, 5 AND 7 PRONG REACTIONS.
'PARAMETRIZATION'.
'INTERFERENCE'.
The total and differential cross sections of the K¯0p→Λπ+ and K¯0p→∑0π+ reactions have been measured in the centre-of-mass energy range of l.5 to 2.3 GeV. Using our K¯0p→∑0π+ data as well as available cross-section data of isospin related channels, we have calculated the total I=0K¯N→∑π cross section as function of energy. The results are compared with predictions obtained from K¯N phase-shift analyses.
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The π−+p→π0+n differential cross section at 180° has been measured for 52 values of π− momentum from 1.8 to 6.0 GeV/c using a constant-geometry detection system. The average statistical uncertainty is ∼5% and the systematic uncertainty is ∼10%. The details of the experiment and the data analysis are discussed. The data are compared with those of other experiments with which they are generally in agreement. One set of data disagrees with those presented here and a possible reason for this is discussed. A five-parameter fit of the predictions of a dual-resonance model to our data gave excellent agreement. The differential cross sections at 180° for π±p elastic scattering have been compiled and the moduli and relative phase of the T=12 and T=32 pion-nucleon s- and u-channel amplitudes (|A12|, |A32|, and cosδ) have a minimum at u=0.4 GeV/c and, in the s channel, a corresponding minimum at s=2.2 GeV/c.
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The electroproduction of a π-meson and of a Δ(1236) nucleon resonance on hydrogen, ep → e πΔ (1236), was investigated in the two charge states π − Δ ++ and π + Δ 0 by measuring the scattered lepton and the produced π-meson in coincidence. The differential cross sections as funcions of W , q 2 , t − t min and ø πq were determine in the following kinematical region: w = (π + δ) 2 = 2.0 − 3.0 GeV , |q 2 | = |(e−e′) 2 | = 0.15 − 0.8 GeV 2 /c 2 , |t − t min | = 0-0.5 GeV 2 /c 2 with t = ( p − δ) 2 , φ πq = 0 − 360° .
W-DEPENDENCE FOR 4.0 GEV INCIDENT POSITRONS.
W-DEPENDENCE FOR 4.9 GEV INCIDENT POSITRONS.
W-DEPENDENCE FOR 5.4 GEV INCIDENT POSITRONS.
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