On the phenomenology of a nonlinear $U(1)_{\rm Y}$ sector
Abstract
In this work we perform a nonlinear extension of the $U(1)_{\rm Y}$ sector of the Standard Model leading to novel quartic effective interactions between the neutral gauge bosons. We study the induced nonlinear effects through highenergy processes resulting in three photons, namely, Zboson decay and electronpositron annihilation. We also discuss the scattering of neutral gauge bosons induced at tree level. Available experimental data on these processes do not yield viable lower bounds on the mass parameter $\sqrt{\beta}$, but we estimate that the region $\sqrt{\beta} \lesssim m_Z$ could be excluded with higher statistics in future $e^ e^+$ colliders operating at or above the Zpole.
 Publication:

arXiv eprints
 Pub Date:
 September 2021
 arXiv:
 arXiv:2109.12245
 Bibcode:
 2021arXiv210912245D
 Keywords:

 High Energy Physics  Phenomenology;
 High Energy Physics  Theory
 EPrint:
 13 pages, 5 figures, 2 tables