Unified theory of NN πd, πd πd and NN NN  reactions

B. Blankleider, I. R. Afnan

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    167 Citations (Scopus)


    Using a set of equations that couple the N-N to the π-d channel and satisfy two- and three-body unitarity, we have studied in detail the reaction ppπ+d, and πdπd and NNNN scattering. We find that the equations give a very good description of the differential cross sections and some of the polarization data for both ppπ+d and πdπd over the energy region 47<Tπ<256 MeV. We observe that for ppπ+d, higher partial waves (lπd >2) contribute significantly to both the differential cross section and analyzing power. Including the P11 π-N interaction and thus true absorption in π-d elastic scattering, we find a cancellation between the pole and nonpole parts of the P11 amplitude. A major part of the effect of true absorption is in Jπ=0+, which contributes little to the absorption cross section. The sensitivity of the results to the D state of the deuteron and the choice of the πNN form factor is investigated. For N-N scattering the agreement with the experimental phase shifts is better in the singlet than triplet channels. This is due to the absence of vector meson exchange in the calculation. The 1D2 phase shift exhibits resonance behavior in the absence of a pole in the amplitude. 

    Original languageEnglish
    Pages (from-to)1572-1595
    Number of pages24
    JournalPhysical Review C
    Issue number4
    Publication statusPublished - Oct 1981


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