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Lorentz violation in fermion-antifermion decays of spinless particles

Brett Altschul*

  • Department of Physics and Astronomy, University of South Carolina, Columbia, South Carolina 29208, USA

  • *baltschu@physics.sc.edu
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Phys. Rev. D 89, 116007 – Published 6 June, 2014

DOI: https://doi.org/10.1103/PhysRevD.89.116007

Abstract

If Lorentz and CPT violations exist, they could affect the decays of scalar and pseudoscalar particles. For a decay into a fermion and an antifermion (not necessarily of the same mass), both the total decay rate and the outgoing particle distribution may be modified, through interference between the conventional decay mechanism and a separate Lorentz-violating mechanism. The modifications are sensitive to forms of Lorentz violation that are otherwise rather difficult to study, since at tree level they do not affect particle propagation, but only interaction vertices. Using existing experimental data on charged pion decay, it is possible to constrain three parameters in the modified pion-muon-neutrino coupling at better than the 10−9 level; these are the first bounds on these quantities.

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Outline

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Phys. Rev. D 89, 116007– Published 6 June, 2014
  • Received 12 March 2014

© 2014 American Physical Society

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