The D coefficient in neutron beta decay in effective field theory
Abstract
In this paper we explore the time-reversal-odd triple-correlation coefficient in neutron beta decay, the so-called "D coefficient", using heavy-baryon effective field theory with photon degrees of freedom. We find that this framework allows us to reproduce the known results for the contribution which comes from final-state interactions, and also to discuss higher-order corrections. In particular we are able to show that in the heavy-baryon limit all electromagnetic contributions vanish. By calculating the leading correction to the known result, we give a final expression which is accurate to better than 1%. Hence we extend downwards the range over which the D coefficient could be used to explore time-violation from new physics.
Cite
@article{arxiv.0902.1194,
title = {The D coefficient in neutron beta decay in effective field theory},
author = {Shung-ichi Ando and Judith A. McGovern and Toru Sato},
journal= {arXiv preprint arXiv:0902.1194},
year = {2010}
}
Comments
12c pages, 3 eps figures Version accepted for publication in Physics Letters B; minor changes of wording