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We introduce a new asymmetry in the decay t → W b → ℓ ν 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.
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Aguilar–Saavedra et al. (2012) studied this question.
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