Single top polarisation as a window to new physics

Aguilar-Saavedra, J.A.  (Departamento de Física Teórica y del Cosmos, Universidad de Granada, Granada, E-18071, Spain) ; Degrande, C. (CERN, Theory Department, Geneva 23, CH-1211, Switzerland) ; Khatibi, S. (School of Particles and Accelerators, Institute for Research in Fundamental Sciences (IPM), P.O. Box 19395-5531, Tehran, Iran)

14 April 2017

Abstract: We discuss the effect of heavy new physics, parameterised in terms of four-fermion operators, in the polarisation of single top (anti-)quarks in the t -channel process at the LHC. It is found that for operators involving a right-handed top quark field the relative effect on the longitudinal polarisation is twice larger than the relative effect on the total cross section. This enhanced dependence on possible four-fermion contributions makes the polarisation measurements specially interesting, in particular at high momenta.

Published in: Physics letters B (2017)
Published by: Elsevier
DOI: 10.1016/j.physletb.2017.04.023
License: CC-BY-3.0

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