Anomalous gauge couplings of the Higgs boson at high energy photon colliders

Abstract

We study the sensitivity of testing the anomalous gauge couplings $g_{HVV}$'s of the Higgs boson in the formulation of linearly realized gauge symmetry via the processes ${\hat{I}}^3{\hat{I}}^3\to ZZ$ and ${\hat{I}}^3{\hat{I}}^3\to WWWW$ at polarized and unpolarized photon colliders based on $e^{+}{e}^{-}$ linear colliders of c.m.~energies 500 GeV, 1 TeV, and 3 TeV. Signals beyond the standard model (SM) and SM backgrounds are carefully studied. We propose certain kinematic cuts to suppress the standard model backgrounds. For an integrated luminosity of 1 ab${}^{-1}$, we show that (a) ${\hat{I}}^3{\hat{I}}^3\to ZZ$ can provide a test of $g_{H{\hat{I}}^3{\hat{I}}^3}$ to the $3\ddot{I}ƒ$ sensitivity of $O(10^{-3}-10^{-2})$ TeV${}^{-1}$ at a 500 GeV ILC, and $O(10^{-3})$ TeV${}^{-1}$ at a 1 TeV ILC and a 3 TeV CLIC, and (b) ${\hat{I}}^3{\hat{I}}^3\to WWWW$ at a 3 TeV CLIC can test all the anomalous couplings $g_{HVV}$'s to the $3\ddot{I}ƒ$ sensitivity of $O(10^{-3}-10^{-2})$ TeV${}^{-1}$.

30 pages, 17 figures