Anomalous triple gauge boson couplings in ZZ production at the LHC and the role of Z boson polarizations

Abstract

We study anomalous couplings among neutral gauge bosons in ZZ production at the LHC for s=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 Ax2−y2 is sensitive mainly to the CP-odd couplings f4Z/γ (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.