On polarization parameters of spin-$1$ particles and anomalous couplings in $e^{+}{e}^{-}\to ZZ/Z\gamma$

Abstract

We study the anomalous trilinear gauge couplings of $Z$ and $\gamma$ using a complete set of polarization asymmetries for the $Z$ boson in $e^{+}{e}^{-}\to ZZ/Z\gamma$ processes with unpolarized initial beams. We use these polarization asymmetries, along with the cross section, to obtain a simultaneous limit on all the anomalous couplings using the Markov-Chain--Monte-Carlo (MCMC) method. For an $e^{+}{e}^{-}$ collider running at $500$ GeV center-of-mass energy and $100$ fb${}^{-1}$ of integrated luminosity the simultaneous limits on the anomalous couplings are $1\sim 3\times 10^{-3}$.

Comments: 35+1 pages, 15 figures, 10 tables; v2: some changes in abstract, introduction and discussions, version accepted for publication in EPJC