Eligibility of EFT approach to search for tqg FCNC phenomenon

Abstract

The Effective Field Theory (EFT) approach is widely used in the search for possible deviations from the predictions of the Standard Model. Such an approximation of possible BSM physics is valid up to a certain levels of energy scale and accuracy. In this article, we investigate potential limitation of the EFT approach related to unitarity to describe possible contributions of flavor changing neutral currents (FCNC) involving the top quark. The numerical and analytical calculations of the FCNC processes used in the EFT approach demonstrate the constant asymptotic behavior of the total cross section with increasing energy. It is shown that the EFT approach for studying the possible contribution of FCNC does not violate the restrictions following from perturbative unitarity, the asymptotic behavior of the cross section does not exceed the Froissart bound, and the approach itself can be used to set the corresponding experimental limits for FCNC couplings or Wilson coefficients at present and future colliders.

References in corpus (6)

• Dimension-Six Terms in the Standard Model Lagrangian
• CompHEP 4.4 - Automatic Computations from Lagrangians to Events
• A minimal set of top anomalous couplings
• Top-Charm Strong Flavor-Changing Neutral Currents at the Tevatron
• Search for top-quark production via flavor-changing neutral currents in W+1 jet events at CDF
• Search for flavor changing neutral currents via quark-gluon couplings in single top quark production using 2.3 fb^-1 of ppbar collisions

Cited by in corpus (2)

• Radiative Decays of Charged Leptons in the Seesaw Effective Field Theory with One-loop Matching
• Unitarity Bounds on Effective Field Theories at the LHC