Decay angular distributions in diffractive one-pion production at ISR energy

• Published in: Physics letters. B Vol. 63; no. 4; pp. 483 - 486
• Main Authors: De Kerret, H., Nagy, E., Regler, M., Schmidt-Parzefall, W., Schubert, K.R., Winter, K., Brandt, A., Dibon, H., Flügge, G., Niebergall, F., Schumacher, P.E., Aubert, J.J., Broll, C., Coignet, G., Favier, J., Massonnet, L., Vivargent, M., Bartl, W., Eichinger, H., Gottfried, Ch, Neuhofer, G.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.01.1976; Elsevier
• Subjects: High Energy Physics - Experiment; Physics
• ISSN: 0370-2693; 1873-2445
• DOI: 10.1016/0370-2693(76)90402-0

New experimental results are reported on decay angular distributions in diffractive dissociation of protons into (nπ +) in proton-proton collisions at a centre-of-mass energy of s = 45 GeV . There is a strong evidence for two distinct components of diffraction dissociation which have different decay angular distributions in the Gottfried-Jackson frame; the resonant and the non-resonant component with (nπ +) invariant mass in the interval 1.6 < m < 1.7 GeV are separated by their different t dependence. We find strong violation of s-channel and t-channel helicity consevation for both the resonant and the non-resonant component.