Bound on the anomalous tbW coupling from two-loop contribution to neutron electric dipole moment
High Energy Physics - Phenomenology
2008-11-26 v1
Abstract
The two-loop contribution to the electric dipole moment (EDM) and the chromo electric dipole moment (CEDM) of an arbitrary fermion f induced by the most general renormalizable tbW coupling with complex left- and right-handed components (a_L and a_R) is calculated. The analytical expressions are numerically evaluated and the current experimental constraints on the electron, neutron and mercury atom EDMs are used to obtain a bound on the complex phase Im(a^*_La_R). It is found that the most stringent constraint, Im(a^*_La_R)<2.33 X 10^{-2}, arises from the neutron EDM.
Keywords
Cite
@article{arxiv.0708.1786,
title = {Bound on the anomalous tbW coupling from two-loop contribution to neutron electric dipole moment},
author = {A. Avilez-Lopez and H. Novales-Sanchez and G. Tavares-Velasco and J. J. Toscano},
journal= {arXiv preprint arXiv:0708.1786},
year = {2008}
}
Comments
13 pages, 3 figures