The D coefficient in neutron beta decay in effective field theory

Details The D coefficient in neutron beta decay in effective field theory The D coefficient in neutron beta decay in effective field theory

2009-02-06

arxiv.org/abs/0902.1194v2

Phys. Lett. B 677 109 (2009)

Physics

Nuclear Physics

Nuclear Theory

12c pages, 3 eps figures Version accepted for publication in Physics Letters B; minor changes of wording

Scientific paper

10.1016/j.physletb.2009.04.088

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.

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