Chiral couplings of W and top quark polarization at the LHC

Shrihari Gopalakrishna, Tao Han, Ian Lewis, Zong-guo Si, and Yu-Feng Zhou
Phys. Rev. D 82, 115020 – Published 21 December 2010

Abstract

If a TeV-scale charged gauge boson (W) is discovered at the Large Hadron Collider (LHC), it will become imperative to determine its chiral couplings to standard model (SM) fermions in order to learn about the underlying theory containing the W. We describe the reconstruction of the tb decay mode of the W at the LHC, and identify various kinematic observables such as the angular distributions of the top quark and the lepton resulting from top decay that can be used to disentangle the chiral couplings of the W to SM fermions. We demonstrate by presenting analytical expressions, numerical simulations, as well as intuitive illustrations for these observables at the LHC that among the SM fermions, the polarized top quark can most directly probe the chirality of such couplings.

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  • Received 7 September 2010

DOI:https://doi.org/10.1103/PhysRevD.82.115020

© 2010 The American Physical Society

Authors & Affiliations

Shrihari Gopalakrishna1,2, Tao Han3, Ian Lewis3, Zong-guo Si4, and Yu-Feng Zhou5

  • 1The Institute of Mathematical Sciences, Chennai 600113, India
  • 2School of Physics, University of Melbourne, Victoria 3010, Australia
  • 3Department of Physics, University of Wisconsin, Madison, Wisconsin 53706, USA
  • 4Department of Physics, Shandong University, Jinan Shandong 250100, China
  • 5Kavli Institute for Theoretical Physics China, Institute of Theoretical Physics, and Key Laboratory of Frontiers in Theoretical Physics, Chinese Academy of Sciences, Beijing, 100190, China

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Vol. 82, Iss. 11 — 1 December 2010

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