Anomalous triple gauge boson couplings in \textit{ZZ} production at the LHC and the role of \(Z\) boson polarizations

DOI10.1016/J.NUCLPHYSB.2019.114754zbMATH Open1435.81231arXiv1810.11657OpenAlexW2945147168MaRDI QIDQ2186359

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Publication date: 9 June 2020

Published in: (Search for Journal in Brave)

Abstract: We study anomalous couplings among neutral gauge bosons in $ZZ$ production at the LHC for $sqrts=13$ TeV in $4$-lepton final state. We use the cross section and polarization asymmetries of the $Z$ boson to estimate simultaneous limits on anomalous coupling using Markov-Chain--Monte-Carlo (MCMC) method 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 probe to identify $CP$-odd nature of interaction at the LHC. We find that the polarization asymmetries significantly improve the estimation of anomalous couplings should a deviation from the Standard Model (SM) be observed.

Full work available at URL: https://arxiv.org/abs/1810.11657

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