Boundary condition model applie to antinucleon-nucleon scattering.-I

Energy-dependent partial-wave analysis of all antiproton-proton scattering data below 925 MeV/c

“…The dominant feature of antiproton-proton scattering at low energy is the annihilation into mesons, a complex multiparticle process that is difficult to model. In pre-LEAR days, some qualitative understanding was obtained by using simplified prescriptions, such as a simple absorptive boundary condition [2][3][4] or a state-independent two-or three-parameter optical potential [5][6][7][8][9][10][11][12]. These models could describe the integrated total, annihilation, and charge-exchange cross sections, but not the differential observables.…”

Antiproton-proton partial-wave analysis below 925 MeV/c

“…The pseudovector coupling constant of the charged pion to nucleons is determined to be f 2 c = 0.0732(11) at the pion pole, where the error is statistical.Typeset using REVT E X independent of spin, angular momentum, isospin, and energy. This assumption is implemented either by applying a simple absorptive boundary condition [14][15][16][17], or by using a state-independent two-or three-parameter optical potential [18][19][20][21][22][23]. However, when one is interested in describing the data quantitatively, including spin-dependent observables, a less naive approach is called for.…”