Probing anomalous quartic couplings ineγ and γγ colliders

Abstract

We analyze the potential of the ${e}^{+}{e}^{\ensuremath{-}}$ linear colliders, operating in the e\ensuremath{\gamma} and \ensuremath{\gamma}\ensuremath{\gamma} modes, to probe anomalous quartic vector-boson interactions through the multiple production of $W'\mathrm{s}$ and $Z'\mathrm{s}.$ We examine all ${\mathrm{SU}(2)}_{L}\ensuremath{\bigotimes}{U(1)}_{Y}$ chiral operators of order ${p}^{4}$ that lead to new four-gauge-boson interactions but do not alter trilinear vertices. We show that the e\ensuremath{\gamma} and \ensuremath{\gamma}\ensuremath{\gamma} modes are able not only to establish the existence of a strongly interacting symmetry breaking sector but also to probe for anomalous quartic couplings of the order of ${10}^{\ensuremath{-}2}$ at 90% C.L. Moreover, the information gathered in the $e\ensuremath{\gamma}$ mode can be used to reduce the ambiguities of the ${e}^{+}{e}^{\ensuremath{-}}$ mode.