## Physics Department Faculty Publication Series

1997

#### Journal or Book Title

PHYSICS LETTERS B

#### Abstract

Starting from a relativistic formulation of the pion-nucleon-delta system, the most general structure of 1/M corrections for a heavy baryon chiral lagrangian including spin 3/2 resonances is given. The heavy components of relativistic nucleons and delta fields are integrated out and their contributions to the next-to-leaing order lagrangians are constructed explicitly. The effective theory obtained admits a systematic expansion in terms of soft momenta, the pion mass $m_\pi$ and the delta-nucleon mass difference $\Delta$. As an application, we consider neutral pion photoproduction at threshold to third order in this small scale expansion.

This is the pre-published version which is collected from arXiv. The published version is at http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TVN-3SPGXP4-H&_user=1516330&_coverDate=03%2F06%2F1997&_rdoc=1&_fmt=high&_orig=search&_origin=search&_sort=d&_docanchor=&view=c&_searchStrId=1535929515&_rerunOrigin=google&_acct=C000053443&_version=1&_urlVersion=0&_userid=1516330&md5=6290a88ff0c0568f39624b671d9d47cb&searchtype=a

89-95

395

1-2

COinS