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  • Open Access

Interference resurrection of the τ dipole through quantum tomography

Prisco Lo Chiatto*,†

  • *Present address: Max-Planck-Institut für Physik (MPP), Föhringer Ring 6, 80805 Munich, Germany and Weizmann Institute of Science, P.O. Box 26, 76100 Rehovot.
  • †Contact author: prisco.lochiatto@mpp.mpg.de
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Phys. Rev. D 112, 015017 – Published 18 July, 2025

DOI: https://doi.org/10.1103/8gtq-twfc

Abstract

Helicity selection rules can suppress the leading contributions from dimension-6 operators in the Standard Model effective field theory (SMEFT), reducing sensitivity to potential new physics. This paper explores how the interference contributions from the τ lepton’s anomalous dipole moment is restored in different observables, in particular comparing the sensitivity to SMEFT operators of quantum information observable and more traditional spin correlations. We compute the sensitivity of various observables—including entanglement measures, Bell inequality violations, and quantum uncertainties—to new physics effects using Monte Carlo simulations. Spin correlation observables are found to outperform both the integrated cross section and quantum information observables in sensitivity to both CP-conserving and -violating effects, improving the sensitivity to the scale of new physics by up to a factor of 3. Our results suggest that quantum information observables are suboptimal probes for resurrecting the interference, and more in general to disentangle the CP properties of new physics.

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Phys. Rev. D 112, 015017– Published 18 July, 2025
  • Received 29 August 2024
  • Accepted 27 June 2025
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

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