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Nuclear $μ-e$ conversion via Lorentz and CPT violation

William P. McNulty

Abstract

One of the three common experimental channels searching for charged lepton flavor violation (CLFV) via $μ-e$ conversion involves first capturing the muon on a nuclear target. This channel provides a unique opportunity to constrain four-point quark-lepton operators that may contribute to CLFV, in addition to the electromagnetic operators that can also be accessed in the other channels. We investigate the leading Lorentz- and CPT-violating contributions for nuclear $μ-e$ conversion experiments within the Standard-Model Extension and obtain the first bounds on the relevant quark-lepton operators using the results of the SINDRUM II experiment; we also consider possibilities for improved constraints from upcoming experiments.

Nuclear $μ-e$ conversion via Lorentz and CPT violation

Abstract

One of the three common experimental channels searching for charged lepton flavor violation (CLFV) via conversion involves first capturing the muon on a nuclear target. This channel provides a unique opportunity to constrain four-point quark-lepton operators that may contribute to CLFV, in addition to the electromagnetic operators that can also be accessed in the other channels. We investigate the leading Lorentz- and CPT-violating contributions for nuclear conversion experiments within the Standard-Model Extension and obtain the first bounds on the relevant quark-lepton operators using the results of the SINDRUM II experiment; we also consider possibilities for improved constraints from upcoming experiments.
Paper Structure (3 sections, 4 equations, 1 table)

This paper contains 3 sections, 4 equations, 1 table.

Table of Contents

  1. Background
  2. Conversion Rate in the Standard-Model Extension
  3. Results and Outlook