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We present results from a high momentum resolution measurement of the π − p elastic differential cross section near the η production threshold. By analysing the cusp discontinuity in the elastic cross section we deduce the non-spin-flip elastic amplitude and compare it with solutions from phase-shift analyses.
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Measurements are reported of the differential cross section for the reaction π − +p→ ω +n from threshold to a final-state c.m. momentum P ∗ of 200 MeV /c . The previously reported fall in total cross section σ/P ∗ below about 100 MeV/ c is again seen. The differential cross section remains close to isotropic over the entire range. A paralle experiment on the variation in the elastic differential cross section across the threshold shows evidence of this threshold. The elastic data cover a range of incident moments from 1010 to 1180 MeV/ c in steps of 5 MeV/ c .
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Analyzing powers for πp elastic scattering at bombarding energies below the Δ(1232) resonance were measured at TRIUMF using the CHAOS spectrometer and a polarized spin target. This work presents π− data at six incident energies of 57, 67, 87, 98, 117, and 139 MeV, and a single π+ data set at 139 MeV. The higher energy measurements cover an angular range of 72°<~θc.m.<~180° while the lower energies were limited to 101°<~θc.m.<~180°. There is a high degree of consistency between this work and the predictions of the VPI/GWU group’s SM95 partial wave analysis.
Analysing power measurements for a 139 GeV PI+ beam (standard track).
Analysing power measurements for a 139 GeV PI- beam (standard track).
Analysing power measurements for a 117 GeV PI- beam (standard track).
Analysing power measurements for a 98 GeV PI- beam (standard track).
Analysing power measurements for a 87 GeV PI- beam (standard track).
Analysing power measurements for a 87 GeV PI- beam (short track).
Analysing power measurements for a 67 GeV PI- beam (standard track).
Analysing power measurements for a 67 GeV PI- beam (short track).
Analysing power measurements for a 57 GeV PI- beam (short track).
Differential cross sections for pi- p and pi+ p elastic scattering were measured at five energies between 19.9 and 43.3 MeV. The use of the CHAOS magnetic spectrometer at TRIUMF, supplemented by a range telescope for muon background suppression, provided simultaneous coverage of a large part of the full angular range, thus allowing very precise relative cross section measurements. The absolute normalisation was determined with a typical accuracy of 5 %. This was verified in a simultaneous measurement of muon proton elastic scattering. The measured cross sections show some deviations from phase shift analysis predictions, in particular at large angles and low energies. From the new data we determine the real part of the isospin forward scattering amplitude.
Elastic PI- P cross section for incident kinetic energy 43.3 MeV for the rotated target data. Errors shown are statistical only.
Elastic PI- P cross section for incident kinetic energy 43.3 MeV. Errors shown are statistical only.
Elastic PI- P cross section for incident kinetic energy 37.1 MeV. Errors shown are statistical only.
Elastic PI- P cross section for incident kinetic energy 32.0 MeV. Errors shown are statistical only.
Elastic PI- P cross section for incident kinetic energy 25.8 MeV. Errors shown are statistical only.
Elastic PI- P cross section for incident kinetic energy 19.9 MeV. Errors shown are statistical only.
Elastic PI+ P cross section for incident kinetic energy 43.3 MeV for the rotated target data. Errors shown are statistical only.
Elastic PI+ P cross section for incident kinetic energy 43.3 MeV. Errors shown are statistical only.
Elastic PI+ P cross section for incident kinetic energy 37.1 MeV. Errors shown are statistical only.
Elastic PI+ P cross section for incident kinetic energy 32.0 MeV. Errors shown are statistical only.
Elastic PI+ P cross section for incident kinetic energy 25.8 MeV. Errors shown are statistical only.
Elastic PI+ P cross section for incident kinetic energy 19.9 MeV. Errors shown are statistical only.
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