Search for electromagnetic properties of the neutrino in $\gamma e$ and $\gamma\gamma$ collisions at CLIC

TL;DR

This paper investigates nonstandard electromagnetic interactions of neutrinos in high-energy photon-electron and photon-photon collisions at CLIC, setting new bounds on neutrino-photon couplings with significant improvements over previous limits.

Contribution

It provides the first bounds on neutrino-photon couplings at CLIC using realistic photon distribution functions and collider effects, improving existing limits by over 15 orders of magnitude.

Findings

95% CL bounds on neutrino-photon couplings established

Significant enhancement in sensitivity compared to LEP limits

Potential to probe nonstandard neutrino electromagnetic properties

Abstract

We have examined nonstandard $\gamma\nu\bar\nu$ and $\gamma\gamma\nu\bar\nu$ couplings via $\nu\bar\nu$ production in a $e\gamma$ and $\gamma\gamma$ collisions at the CLIC. We obtain 95% confidence level bounds on $\gamma\nu\bar\nu$ and $\gamma\gamma\nu\bar\nu$ couplings by considering the backscattered photon distribution function for incoming photons and Initial State Radiation (ISR) and Beamstrahlung (BS) effect for initial state electrons in the $e\gamma$ and $\gamma\gamma$ collider modes of linear collider. We indicate that the reaction $\gamma\gamma\to\nu\bar\nu$ provides more than 15 orders of magnitude improvement in neutrino-two photon couplings compared to LEP limits.