Two-body Mechanisms in Pion Photoproduction on the Trinucleon

Details Two-body Mechanisms in Pion Photoproduction on the Trinucleon Two-body Mechanisms in Pion Photoproduction on the Trinucleon

1994-10-03

arxiv.org/abs/nucl-th/9410001v2

Phys.Rev.Lett. 75 (1995) 1288-1291

Physics

Nuclear Physics

Nuclear Theory

10 pages, 3 figures (available as postscript files from the authors) Mainz preprint MKPH-T-94-13

Scientific paper

10.1103/PhysRevLett.75.1288

A breakdown of the Impulse Approximation is studied in pion photoproduction on $^3$He at high momentum transfers. The usual DWIA formalism with Faddeev wave functions which works well for small momentum transfers deviates from experimental measurements by up to two orders of magnitude for $Q^2>6 fm^{-2}$. It is found that the explicit inclusion of two-body mechanisms, where the photon is absorbed on one nucleon and the pion is emitted from another nucleon can restore agreement with the data.

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