Two-body Mechanisms in Pion Photoproduction on the Trinucleon

Abstract

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 $Q^2>6f{m}^{-2}$. 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.

arXiv comment10 pages, 3 figures (available as postscript files from the authors) Mainz preprint MKPH-T-94-13

References in corpus (1)

• Pion interaction with the trinucleon up to the eta production threshold

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• Electromagnetic Production of the Hypertriton
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• Coherent Photoproduction of pi^+ from 3^He
• A quark model framework for the study of nuclear medium effects