The Weak-Magnetic Moment of Heavy Quarks
Abstract
With initial and final particles on-shell, the anomalous weak-magnetic dipole moments of b and c quarks are electroweak gauge invariant quantities of the effective couplings Zb\bar{b} and Zc\bar{c}, respectively, and good candidates to test the Standard Model and/or new physics. Here we present a complete computation of these quantities within the Standard Model. We show that decoupling properties with respect to heavy particles do take place in the weak magnetic moment. The obtained values, a_b(M_Z^2)=(2.98-1.56i)x10^(-4) and a_c(M_Z^2)=(-2.80+1.09i)x10^(-5) are dominated by one-gluon exchange diagrams. The electroweak corrections are less than 1% of the total magnitude.
Keywords
Cite
@article{arxiv.hep-ph/9702222,
title = {The Weak-Magnetic Moment of Heavy Quarks},
author = {J. Bernabeu and G. A. Gonzalez-Sprinberg and J. Vidal},
journal= {arXiv preprint arXiv:hep-ph/9702222},
year = {2011}
}
Comments
12 pages, 1 Postscript figure, LaTeX. 1 reference corrected. Published in Phys. Lett. B