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Paper   IPM / Particles / 14772
School of Particles and Accelerator
  Title:   Single top polarisation as a window to new physics
1.  J.A Aguilar-Saavedra
2.  C Degrande
3.  S Khatibi
  Status:   Published
  Journal: Phys. Lett. B
  Vol.:  769
  Year:  2017
  Pages:   498-502
  Supported by:  IPM
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.

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