A minimal set of top anomalous couplings

By J. A. Aguilar-Saavedra. 2008

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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 f i , f j and an off-shell boson V = W , Z , γ , g only involves γ μ and σ μ ν q ν terms, with q = p i − p j . Examples are given for the Wtb , Ztt , γtt 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 γ μ and σ μ ν q ν 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.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/50ceeafc265d47a2112ea7c115ee6b12f3c5b2d5

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In Nuclear and High Energy Physics

Citations in the corpus

Effective Lagrangian for a light Higgs-like scalar (2013, background): “Subsequent analyses [20–25] pointed out the presence of some redundant operators, and a minimal and complete list of operators was finally provided in ref.”
Opportunities in Flavour Physics at the HL-LHC and HE-LHC (2018, methodology): “(119) are in terms of the often-used anomalous couplings [1202, 1215] given by”
Non-resonant new physics in top pair production at hadron colliders (2010, background): “Our analysis aims at identifying the effects of the new physics on top pair production, so it ignores the operators which affect the decay of the top [24, 28, 38].”
A Large Hadron Electron Collider at CERN: Report on the Physics and Design Concepts for Machine and Detector (2012, methodology): “A precise measurement of the couplings between SM bosons and fermions provides a powerful tool for the search of BSM physics allowing a possible detection of deviations from SM predictions [574].”
Measurement of the t-channel single-top-quarkproduction cross section and of the |Vtb| CKM matrixelement in pp collisions at √s = 8 TeV (2014, background): “J H E P 0 6 ( 2 0 1 4 ) 0 9 0 presence of anomalous couplings at the Wtb vertex can produce anomalous form factors [49–51] which are parametrised as fLv, where “Lv” refers to the specific left-handed vector nature of the couplings that would modify the interaction strength.”
Probing top quark neutral couplings in the Standard Model Effective Field Theory at NLO in QCD (2016, neutral): “Up to dimension-six, we consider the following operators [22, 23]: O (3) φQ = i 1 2 y(2) t ( φ† ←→ D μφ ) (Q̄γτ Q) (2.”