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Operator approach to isospin violation in pion photoproduction

Ananthanarayan, B (2006) Operator approach to isospin violation in pion photoproduction. In: Physics Letters B, 634 (4). pp. 391-398.

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Unambiguous isospin violation in the strong interaction sector is a key issue in low energy hadronic physics, both experimentally and theoretically. Bernstein has employed the Fermi-Watson theorem to demonstrate that pion photoproduction is a process where isospin violation in the pi N system can be revealed, an approach we review here. Here we propose a general operator approach to the phenomenon in pion photoproduction, thereby providing an analogue for the framework that was proposed for pi N scattering by Kaufmann and Gibbs. The resulting set of amplitudes Could form the basis for determining the multipole amplitudes for photoproduction. Thus, the so resulting phase shift determination front photoproduction can then be used via the Fermi-Watson theorem to resolve discrepancies in pi N phase shift analyses. We point out that casting effective Lagrangian results in terms of our framework would be beneficial. The upcoming polarization experiments are an ideal setting to test our approach, and also to constrain better the isotensor currents which strictly are not forbidden

Item Type: Journal Article
Publication: Physics Letters B
Publisher: Elsavier
Additional Information: Copyright of this article belongs to Elsavier.
Department/Centre: Division of Physical & Mathematical Sciences > Centre for High Energy Physics
Date Deposited: 02 Apr 2009 06:59
Last Modified: 19 Sep 2010 04:59
URI: http://eprints.iisc.ac.in/id/eprint/17964

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