Chromomagnetic dipole moment of the top quark in the Bestest Little Higgs model

Abstract

We calculate the chromomagnetic dipole moment of the top quark, ${\hat{\mu }}_t$, in the context of the Bestest Little Higgs model. This extension of the Standard Model aims to solve the hierarchy problem without fine tuning, by introducing one-loop corrections to the Higgs boson mass through heavy top quark partners and heavy gauge bosons. We found that the largest resulting value for the chromomagnetic is ${\hat{\mu }}_t\sim 10^{-5}$ and the lowest is around $10^{-6}$, mainly due to the Higgs boson of the Standard Model, which couples to both the top quark of the Standard Model and its heavy partners. Also, we present a wide variety of new Feynman rules involved in our calculation.

arXiv comment16 pages, 7 figures

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