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Henner, V.K.; Meshcheryakov, V.A.
Joint Inst. for Nuclear Research, Dubna (Russian Federation). Lab. of Theoretical Physics1991
Joint Inst. for Nuclear Research, Dubna (Russian Federation). Lab. of Theoretical Physics1991
AbstractAbstract
[en] Multichannel M-matrix method is applied to an NN-bar-system with taking into account elastic pp-bar-scattering, charge-exchange pp-bar→nn-bar reaction and pp-bar annihilation. It is shown that contrary to standard assumptions the isotopic invariance due the large influence of the charge exchange channel affects very significantly the parameters of strong interactions. Contrary to previous descriptions, M-matrix elements are treated as real functions. The differential and total cross-sections for pp-bar→pp-bar and pp-bar→nn-bar processes, cross-section δtot(pp-bar) and the real-to-imaginary ratio of the forward amplitude of elastic pp-bar scattering up to beam momenta plab=600 MeV/c are described. The fitting leads to a resonance in the s-wave at about plab=500 MeV/c and to bound states in p-wave near the pp-bar threshold. 33 refs.; 8 figs.; 3 tabs
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Source
1991; 20 p; Submitted to Z. Phys. The Talk Given at Nucleon-antinucleon Conference (NAN 91), July 10, ITEP, Moscow, USSR.
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Report
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ANNIHILATION, BOUND STATE, CHARGE-EXCHANGE INTERACTIONS, COUPLED CHANNEL THEORY, DIFFERENTIAL CROSS SECTIONS, ELASTIC SCATTERING, MATRIX ELEMENTS, MEV RANGE 100-1000, MINIMIZATION, NEUTRON-ANTINEUTRON INTERACTIO, NUCLEON-ANTINUCLEON INTERACTIO, P WAVES, PROTON-ANTIPROTON INTERACTIONS, S WAVES, SCATTERING AMPLITUDES, SCATTERING LENGTHS, TOTAL CROSS SECTIONS
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