Probing the Higgs-Gauge Couplings at Leptonic Colliders

Аннотация

In this work, we investigate the Higgs-gauge couplings $hVV$ (with $V=W,Z$) through different final states at leptonic colliders. In many SM extensions, these couplings could be modified as $g_{hVV}={\kappa }_V{g}_{hVV}^{SM}$, either via radiative contributions or due compositeness nature of the Higgs and/or gauge bosons. As a first step, by assuming that the
Higgs-gauge couplings are SM-like (${\kappa }_V=\pm 1$), we consider the three final states at leptonic colliders $h\nu \overline{\nu }@250\mathrm{GeV}$,$h{W}^{+}{W}^{-}@500\mathrm{GeV}$ and $Z{W}^{+}{W}^{-}@1\mathrm{TeV}$
(with $h\to b\overline{b}$,~$Z\to jj$ and $W^{-}\to {\ell }^{-}\overline{\nu }$); in order to identify ${\kappa }_V$ sings via possible deviation of the cross section values with respect to the SM. Then, by considering that such a deviation in ${\kappa }_V$ with respect to the SM can not be seen at HL-LHC, i.e., $\left|\delta {\kappa }_V/{\kappa }_V\right|\approx 0.04\sim 0.05$, we explore these three processes in the signal case $\left|{\kappa }_V\right|=1$ to produce some kinematic variables distributions. This may affect
the cross section and the kinematic distributions, and tiny excess or lack in events could be reported.