Phenomenology of a Born-Infeld extension of the $U(1{)}_{\mathrm{Y}}$ sector at lepton colliders

Abstract

In this work we perform a non-linear extension of the $U(1{)}_{\mathrm{Y}}$ sector of the Standard Model leading to novel quartic effective interactions between the neutral gauge bosons. We study the induced effects through high-energy processes resulting in three photons, namely, Z-boson decay and electron-positron annihilation. Available experimental data on these processes do not yield viable lower bounds on the mass parameter $\sqrt{\beta }$, but we estimate that the range $\sqrt{\beta }\lesssim m_Z$ could be reliably excluded with better statistics in future $e^{-}{e}^{+}$ colliders. We also discuss neutral gauge-boson scatterings, contextualizing our findings with recent results on anomalous quartic gauge couplings.

Comments: 16 pages, 5 figures. The title has been changed, section 3C improved, results unchanged. Matches published version