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Lorentz and CPT violation in top-quark production and decay

Micheal S. Berger, V. Alan Kostelecký, and Zhi Liu

  • Physics Department, Indiana University, Bloomington, Indiana 47405, USA

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Phys. Rev. D 93, 036005 – Published 17 February, 2016

DOI: https://doi.org/10.1103/PhysRevD.93.036005

Abstract

The prospects are explored for testing Lorentz and CPT symmetry in the top-quark sector. We present the relevant Lagrange density, discuss physical observables, and describe the signals to be sought in experiments. For top-antitop pair production via quark or gluon fusion with subsequent semileptonic or hadronic decays, we obtain the matrix element in the presence of Lorentz violation using the narrow-width approximation. The issue of testing CPT symmetry in the top-quark sector is also addressed. We demonstrate that single-top production and decay is well suited to a search for CPT violation, and we present the matrix elements for single-top production in each of the four tree-level channels. Our results are applicable to searches for Lorentz violation and studies of CPT symmetry in collider experiments, including notably high-statistics top-antitop and single-top production at the Large Hadron Collider.

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Phys. Rev. D 93, 036005– Published 17 February, 2016
  • Received 2 October 2015
Article part of CHORUS

© 2016 American Physical Society

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