Sensitivity of polarizations and spin correlations of Z boson to anomalous neutral triple gauge couplings at lepton collider with polarized beams

• Published in: Physical review. D 2024-03, Vol.109 (5), Article 055047
• Main Authors: Subba, Amir, Singh, Ritesh K.
• Format: Article
• Language: English
• ISSN: 2470-0010; 2470-0029
• DOI: 10.1103/PhysRevD.109.055047

We investigate the effects of anomalous neutral triple gauge couplings in Z Z and Z γ production processes, followed by the leptonic decay of the Z boson, at a lepton collider with center-of-mass energy s = 250 GeV and polarized beams. We use an effective Lagrangian formalism to parametrize the anomalous couplings in terms of dimension-8 operators c B ˜ W , c B W , c W W , and c B B , and study the sensitivity of observables such as cross section, polarization, and spin correlation as functions of these couplings. We perform a Bayesian statistical analysis using Markov Chain Monte Carlo methods to determine simultaneous limits on the anomalous couplings, taking into account various luminosities L ∈ { 0.1 ab − 1 , 0.3 ab − 1 , 1 ab − 1 , 3 ab − 1 , 10 ab − 1 } and systematic uncertainties. We find that polarization and spin correlation observables significantly enhance the sensitivity to anomalous couplings, providing stringent constraints on these couplings.