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Please use this identifier to cite or link to this item: http://hdl.handle.net/10481/30593

Title: A minimal set of top anomalous couplings
Authors: Aguilar-Saavedra, Juan Antonio
Issue Date: 2009
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.
Sponsorship: This work has been supported by a MEC Ramón y Cajal contract, MEC project FPA2006-05294 and Junta de Andalucía projects FQM 101 and FQM 437.
Publisher: Elsevier
Keywords: Beyond Standard Model
LHC (Large Hadron Collider)
URI: http://hdl.handle.net/10481/30593
ISSN: 0550-3213
Rights : Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License
Citation: Aguilar-Saavedra, J.A. A minimal set of top anomalous couplings. Nuclear Physics B, 812(1-2): 181-204 (2009). [http://hdl.handle.net/10481/30593]
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