On anomalous triple gauge boson couplings in $ZZ$ production at LHC with $Z$ boson spin observables

Rafiqul Rahaman, Ritesh K. Singh

Published 2018-10-27Version 1

We study anomalous couplings among neutral gauge bosons in $ZZ$ production at LHC for $\sqrt{s}=13$ TeV in $4$-lepton final state. We use cross section at $M_{4l}>1$ TeV and polarization of $Z$ boson to study the sensitivity on anomalous coupling and do a full markov-chain--monte-carlo (MCMC) analysis over parameter space to extract simultaneous limits on them for luminosities $35.9$ fb$^{-1}$, $150$ fb$^{-1}$, $300$ fb$^{-1}$ and $1000$ fb$^{-1}$. The $CP$-even polarization asymmetry $A_{x^2-y^2}$ is sensitive mainly to the $CP$-odd couplings $f_4^{Z/\gamma}$ (quadratically) providing a tools to identify $CP$-odd interaction at LHC. The expected simultaneous limits on couplings at $35.9$ fb$^{-1}$ are $\sim1\times 10^{-3}$ and at $1000$ fb$^{-1}$ they are $\sim 0.5\times 10^{-3}$.