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Please use this identifier to cite or link to this item: http://hdl.handle.net/10481/30675

Title: Probing anomalous Wtb couplings in top pair decays
Authors: Aguilar-Saavedra, Juan Antonio
Carvalho, J.
Castro, N. F.
Onofre, Antonio
Veloso, F.
Issue Date: 2006
Abstract: We investigate several quantities, defined in the decays of top quark pairs, which can be used to explore non-standard Wtb interactions. Two new angular asymmetries are introduced in the leptonic decay of top (anti)quarks. Both are very sensitive to anomalous Wtb couplings, and their measurement allows for a precise determination of the W helicity fractions. We also examine other angular and energy asymmetries, the W helicity fractions and their ratios, as well as spin correlation asymmetries, analysing their dependence on anomalous Wtb couplings and identifing the quantities which are most sensitive to them. It is explicitly shown that spin correlation asymmetries are less sensitive to new interactions in the decay of the top quark; therefore, when combined with the measurement of other observables, they can be used to determine the t tbar spin correlation even in the presence of anomalous Wtb couplings. We finally discuss some asymmetries which can be used to test CP violation in t tbar production and complex phases in the effective Wtb vertex.
Sponsorship: The work of J.A.A.-S. has been supported by a MEC Ramon y Cajal contract and project FPA2003–09298–C02–01, and by Junta de Andalucía through project FQM-101. The work of J.C., N.C. (grant SFRH/BD/13936/2003), A.O. and F.V. (grant SFRH/BD/18762/2004) has been supported by Fundaçao para a Ciência e a Tecnologia.
Keywords: Top quark
URI: http://hdl.handle.net/10481/30675
ISSN: 1434-6044
Rights : Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License
Citation: Aguilar-Saavedra, J.A.; et al. Probing anomalous Wtb couplings in top pair decays. European Physical C, 50: 519-533 (2007). [http://hdl.handle.net/10481/30675]
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