Production mechanisms and polarization observables for p + d -> He(3) + pi(o) near threshold

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dc.creatorCanton, L.
dc.creatorPisent, G.
dc.creatorSchadow, W.
dc.creatorSvenne, J. P.
dc.date2002-10-25
dc.date.accessioned2026-07-07T05:39:20Z
dc.date.available2026-07-07T05:39:20Z
dc.descriptionPion production at threshold from nucleon-deuteron collisions is considered, with reference to the outgoing channel where the three-nucleon system is bound. The available experimental data are compared with calculations using accurate nuclear wavefunctions coming from rigorous solutions of the three-nucleon quantum mechanical equations. The dominant contributions for pion production are obtained through matrix elements involving pion-nucleon rescattering mechanisms in S- and P-waves. S-wave rescattering includes also an isoscalar contribution which is enhanced because of the off-shell effects. P-wave rescattering includes also diagrams involving explicitly the Delta degrees of freedom. It is found that the pion-nucleon S-wave off-shell effects in the isospin-even channel are of considerable importance. Initial-state interactions between the proton and the deuteron have in general minor effects on the spin-averaged and spin-dependent observables, except when the polarization observable involves interference terms amongst the various helicity amplitudes. Keywords: Polarization phenomena. Pion production. Few-nucleon systems.
dc.description7 pages, including 5 figures. Contributed paper to ISHEPP XVI, 10-15 June 2002, Dubna
dc.identifierhttps://arxiv.org/abs/nucl-th/0210078
dc.identifierhttp://arxiv.org/abs/nucl-th/0210078
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/81927
dc.subjectNuclear Theory
dc.titleProduction mechanisms and polarization observables for p + d -> He(3) + pi(o) near threshold
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