Model-independent measurement of the top quark polarisation
Metadata
Show full item recordEditorial
Elsevier
Materia
Top quark Polarisation
Date
2013Referencia bibliográfica
Aguilar-Saavedra, J.A.; Herrero-Hahn, R.V. Model-independent measurement of the top quark polarisation. Physics Letters B, 718(3): 983-987 (2013). [http://hdl.handle.net/10481/30475]
Sponsorship
This work has been supported by MICINN by projects FPA2006-05294 and FPA2010-17915, Junta de Andalucía (FQM 101, FQM 03048 and FQM 6552) and Fundação para a Ciência e Tecnologia (FCT) project CERN/FP/123619/2011.Abstract
We introduce a new asymmetry in the decay t -> W b -> l nu b, which is shown to be directly proportional to the polarisation of the top quark along a chosen axis, times a sum of W helicity fractions. The latter have already been precisely measured at the Tevatron and the Large Hadron Collider. Therefore, this new asymmetry can be used to obtain a model-independent measurement of the polarisation of top quarks produced in any process at hadron or lepton colliders.