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Please use this identifier to cite or link to this item: http://hdl.handle.net/10481/30596

Title: Single top quark production at LHC with anomalous Wtb couplings
Authors: Aguilar-Saavedra, Juan Antonio
Issue Date: 2008
Abstract: We investigate single top production in the presence of anomalous Wtb couplings. We explicitly show that, if these couplings arise from gauge invariant effective operators, the only relevant couplings for single top production and decay are the usual gamma^mu and sigma^mu nu q_nu terms, where q is the W boson momentum. This happens even in the single top production processes where the Wtb interaction involves off-shell top and/or bottom quarks. With this parameterisation for the Wtb vertex, we obtain expressions for the dependence on anomalous couplings of the single top cross sections, for (i) the t-channel process, performing a matching between tj and t bbar j production, where j is a light jet; (ii) s-channel t bbar production; (iii) associated tW- production, including the correction from tW- bbar. We use these expressions to estimate, with a fast detector simulation, the simultaneous limits which the measurement of single top cross sections at LHC will set on V_tb and possible anomalous couplings. Finally, a combination with top decay asymmetries and angular distributions is performed, showing how the limits can be improved when the latter are included in a global fit to Wtb 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: Top quark
LHC (Large Hadron Collider)
URI: http://hdl.handle.net/10481/30596
ISSN: 0550-3213
Rights : Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License
Citation: Aguilar-Saavedra, J.A. Single top quark production at LHC with anomalous Wtb couplings. Nuclear Physics B, 804(1-2): 160-192 (2008). [http://hdl.handle.net/10481/30596]
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