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Maximizing the azimuthal-angle correlation in the decay of vector boson pairs

Kun Cheng1,*, Yi-Jing Fang2,3,†, Tao Han1,‡, and Matthew Low1,§

  • *Contact author: kun.cheng@pitt.edu
  • †Contact author: fangyj@ihep.ac.cn
  • ‡Contact author: than@pitt.edu
  • §Contact author: mal431@pitt.edu
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Phys. Rev. D 112, 013005 – Published 9 July, 2025

DOI: https://doi.org/10.1103/vxcx-1czf

Abstract

Spin correlation observables of particles produced at colliders generally depend on the coordinate basis. While spin correlations and their associated basis dependence have been studied in top-quark pair production, the basis dependence of spin correlations of W± pairs has not been studied. In this work, we focus on the azimuthal-angle correlation in the decay of W± pairs, which encodes spin information in the direction transverse to the rotational axis. We quantitatively describe the basis dependence of the relative azimuthal angle. We further present the optimal coordinate direction to define the azimuthal angle between the decay products of W± bosons to achieve the maximal spin correlation based on symmetry considerations. The results can be used to optimize the measurement of the CP-even and CP-odd interactions, and have applications to quantum information observables in the vector boson pair system.

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Phys. Rev. D 112, 013005– Published 9 July, 2025
  • Received 1 March 2025
  • Accepted 16 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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