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Chromomagnetic Dipole Moment of the Top Quark Revisited

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arxiv hep-ph/0701098 v2 pith:6IUUIB63 submitted 2007-01-12 hep-ph

Chromomagnetic Dipole Moment of the Top Quark Revisited

classification hep-ph
keywords modelsdeltakappadipolemomentquarkassitedchromagnetic
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We study the complete one-loop contributions to the chromagnetic dipole moment $\Delta\kappa$ of the top quark in the Standard Model, two Higgs doublet models, topcolor assited technicolor models (TC2), 331 models and extended models with a single extra dimension. We find that the SM predicts $\Delta\kappa = - 0.056$ and that the predictions of the other models are also consitent with the constraints imposed on $\Delta\kappa$ by low-energy precision measurements.

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    Quantum information observables in LHC top quark pair production are modified by SMEFT dimension-6 operators in ways that depend on their CP properties, offering a complementary probe beyond standard observables.