Photoproduction of neutral pions
Abstract
The pion and nucleon mass differences generate a very pronounced cusp in the photoproduction reaction of a single neutral pion on the proton. A nonrelativistic effective field theory to describe this reaction is constructed. The approach is rigorous in the sense that it is an effective field theory with a consistent power counting scheme. Expressions for the S and Pwave multipole amplitudes at one loop are given. The relation of the phase of the electric multipole E_0+ to the phase of the Swave of pi^0 p > pi^0 p scattering is discussed.
 Publication:

6th International Workshop on Chiral Dynamics
 Pub Date:
 2009
 DOI:
 10.22323/1.086.0054
 arXiv:
 arXiv:0910.0209
 Bibcode:
 2009chdy.confE..54F
 Keywords:

 High Energy Physics  Phenomenology
 EPrint:
 9 pages, 1 figure, Proceedings '6th International Workshop on Chiral Dynamics'