Eur. Phys. J. A (2004) 22: 503-514
https://doi.org/10.1140/epja/i2004-10052-6

Improved analysis of coherent neutral pion electroproduction on deuterium in chiral perturbation theory^a

¹ Universität Bonn, Nußallee 14-16, D-53115, Bonn, Germany
² Laboratoire de Physique Théorique, Université Louis Pasteur, F-67084, Strasbourg Cedex 2, France
³ Forschungszentrum Jülich, D-52425, Jülich, Germany

Received: 4 May 2004
Accepted: 23 July 2004
Published online: 16 November 2004

Abstract

Coherent near-threshold neutral pion electroproduction on the deuteron is studied in the framework of heavy baryon chiral perturbation theory. We include the next-to-leading-order corrections to the three-body contributions. We find an improved description of the total and differential cross-section data measured at MAMI. We also obtain more precise values for the threshold S-wave multipoles. We discuss in detail the theoretical uncertainties of the calculation.