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Optimal estimation of Higgs-gauge boson couplings at the future e+e− colliders

Subhaditya Bhattacharya*, Amir Subba†, and Abhik Sarkar‡

  • *Contact author: subhab@iitg.ac.in
  • †Contact author: amirsubba@iitg.ac.in
  • ‡Contact author: sarkar.abhik@iitg.ac.in
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Phys. Rev. D 112, 115018 – Published 4 December, 2025

DOI: https://doi.org/10.1103/8vz9-dh9v

Abstract

The proposed e+e− collider offers an ideal environment for precise estimation of Higgs boson properties which are of utmost importance to validate the Standard Model of particle physics. We investigate hVV couplings, where V∈{Z,γ} with single Higgs production associated with Z boson at the proposed e+e− machine with s=250  GeV, within the Standard Model effective field theory framework. We employ the recoil mass of the dilepton system, to select the signal phase space, i.e, Zh→l+l−bb¯ events. The constraints on the Wilson coefficients (WCs) are obtained using the optimal observable technique. On comparison with the current experimental limits at 68% CL with 138  fb−1 luminosity, our limits are tighter by a factor ranging from 1.5–10 for CP-even operators, while CP-odd WCs shows comparable limits.

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Probing CP-violating Higgs-gauge couplings with Higgsstrahlung at e−e+ colliders

Amir Subba, Subhaditya Bhattacharya, and Abhik Sarkar
Phys. Rev. D 113, 055018 (2026)

Article Text

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Phys. Rev. D 112, 115018– Published 4 December, 2025
  • Received 18 August 2025
  • Accepted 21 November 2025
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