A minimal set of top anomalous couplings

Abstract

We simplify the general form of the fermion-fermion-gauge boson interactions generated by dimension-six gauge-invariant effective operators by using the equations of motion to remove redundant operators. It is found that the most general vertex for off-shell fermions fi, fj and an off-shell boson V=W,Z,gamma,g only involves gamma^mu and sigma^{mu nu} q_nu terms, with q=p_i-p_j. Examples are given for the Wtb, Ztt, gamma tt and gtt interactions, whose general expression is greatly simplified with respect to previous results in the literature. The same arguments apply to top flavour-changing neutral interactions with the Z boson, the photon or the gluon, which can also be parameterised in full generality with only gamma^mu and sigma^{mu nu} q_nu couplings. Explicit expressions are given for these vertices in terms of dimension-six gauge-invariant operators. We also discuss how effective operator coefficients might be determined from eventual measurements of anomalous couplings.

LaTeX 29 pages, 3 PS figures. Minor comments added, final version to appear in NPB

References in corpus (6)

• Single top quark production at LHC with anomalous Wtb couplings
• Probing anomalous Wtb couplings in top pair decays
• Deciphering top flavor violation at the LHC with B factories
• ATLAS sensitivity to Wtb anomalous couplings in top quark decays
• Dimension six FCNC operators and top production at the LHC
• Combined effects of strong and electroweak FCNC effective operators in top quark physics at the LHC

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