pi+- p differential cross sections at low energies

Abstract

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.

13 pages, 5 figures. To appear in PLB

References in corpus (3)

• Dispersion Relation Constrained Partial Wave Analysis of piN Elastic and piN\to\etaN Scattering Data: The Baryon Spectrum
• Low Energy Analyzing Powers in Pion-Proton Elastic Scattering
• Precision Pion-Proton Elastic Differential Cross Sections at Energies Spanning the Delta Resonance

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• Forward analysis of $\pi$N scattering with an expansion method
• Nucleon mass: trace anomaly and $\sigma$-terms