2025/12/02 by Seyit Okan Kara, Kara, Seyit Okan
Computer Science · Physics and Astronomy · #Computational Physics and Python Applications #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Neutrino Physics Research #Particle physics theoretical and experimental studies
paper · pdf · doi:10.48550/arxiv.2512.02773
openalex publication_date 2025/12/02 · openalex created_date 2025/12/04 · openalex updated_date 2026/07/28
We develop a "precision-ready", model-independent EFT framework that connects general leptophilic gauge interactions to their low-energy manifestations in SMEFT and LEFT. Starting from a broad U(1)'ell extension in which leptons carry family-dependent charges (qe, qmu, qtau) while quarks remain neutral, quantum consistency is ensured through a minimal set of vectorlike leptons, chiral under U(1)'ell but vectorlike under the SM, together with singlet scalars responsible for symmetry breaking and the masses of both Zell and the heavy leptons. In the heavy-mediator limit, we integrate out Zell at tree level and derive compact, analytic SMEFT Wilson coefficients for four-lepton operators and Higgs-current structures, including hypercharge-U(1)'ell kinetic mixing proportional to Tr(Y Q'). Renormalization-group evolution down to the electroweak scale and matching onto LEFT produce closed-form expressions directly applicable to e+e- -> l+l-, neutrino trident production, nu e scattering, parity-violating Moeller observables, and muon-decay parameters. A single parameter combination, Lambdaeff = MZell / (gell * sqrt(|q q'|)), governs all leading EFT signatures, offering a unified way to map UV charge assignments onto precision observables. We delineate the validity domain of this EFT and outline its use as a "plug-and-play" interface for global fits, collider recasts, and future-collider projections.