Search for electromagnetic properties of the neutrino in $γe$ and $γγ$ collisions at CLIC

We have examined nonstandard $γν\barν$ and $γγν\barν$ couplings via $ν\barν$ production in a $eγ$ and $γγ$ collisions at the CLIC. We obtain 95% confidence level bounds on $γν\barν$ and $γγν\barν$ 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 $eγ$ and $γγ$ collider modes of linear collider. We indicate that the reaction $γγ\toν\barν$ provides more than 15 orders of magnitude improvement in neutrino-two photon couplings compared to LEP limits.

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