Top polarisation studies in H(-)t and Wt production

Godbole, RM and Hartgring, L and Niessen, I and White, CD (2012) Top polarisation studies in H(-)t and Wt production. In: Journal of High Energy Physics (1).

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Abstract

The polarisation of top quarks produced in high energy processes can be a very sensitive probe of physics beyond the Standard Model. The kinematical distributions of the decay products of the top quark can provide clean information on the polarisation of the produced top and thus can probe new physics effects in the top quark sector. We study some of the recently proposed polarisation observables involving the decay products of the top quark in the context of H(-)t and Wt production. We show that the effect of the top polarisation on the decay lepton azimuthal angle distribution, studied recently for these processes at leading order in QCD, is robust with respect to the inclusion of next-to-leading order and parton shower corrections. We also consider the leptonic polar angle, as well as recently proposed energy-related distributions of the top decay products. We construct asymmetry parameters from these observables, which can be used to distinguish the new physics signal from the Wt background and discriminate between different values of tan beta and m(H)- in a general type II two-Higgs doublet model. Finally, we show that similar observables may be useful in separating a Standard Model Wt signal from the much larger QCD induced top pair production background.

Item Type:	Journal Article
Publication:	Journal of High Energy Physics
Publisher:	Springer
Additional Information:	Copyright of this article belongs to Springer.
Keywords:	Higgs Physics;Beyond Standard Model;Standard Model
Department/Centre:	Division of Physical & Mathematical Sciences > Centre for High Energy Physics
Date Deposited:	18 May 2012 09:14
Last Modified:	18 May 2012 09:16
URI:	http://eprints.iisc.ac.in/id/eprint/44420

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