NN → πD amplitudes from 400 to 800 MeV

Abstract

New data from SIN and LAMPF improve substantially the determination of NN → πd amplitudes. Data of the Geneva group on spin transfer from proton to deuteron it 11 and t 22 polarisations determine magnitudes and phases of two amplitudes previously poorly known, namely a 5 ( 3 F 2) and a 7 ( 1 D 2→l π = 3) , up to 580 MeV. Three new sets of LAMPF data determine a 7 and the magnitude of a 5 up to 800 MeV and a 8 ( 1 G 4), a 9 ( 3 F 3 → l π = 4) and a 10 ( 3 F 4) at 800 MeV . The a 7 amplitude is qualitatively more plausible than earlier values; a 5, a 8, a 9 and a 10 agree with expectation. The determination of amplitudes is now essentially complete except for the phase of a 5 above 580 MeV.