The Weak-Magnetic Moment of Heavy Quarks

Details The Weak-Magnetic Moment of Heavy Quarks The Weak-Magnetic Moment of Heavy Quarks

1997-02-03

arxiv.org/abs/hep-ph/9702222v2

Phys.Lett.B397:255-262,1997

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, 1 Postscript figure, LaTeX. 1 reference corrected. Published in Phys. Lett. B

Scientific paper

10.1016/S0370-2693(97)00185-8

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.

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