$ZZ\gamma$ and $Z\gamma \gamma$ couplings at linear $e^{+}{e}^{-}$ collider energies with the effects of Z polarization and initial state radiation

Abstract

The constraints on the neutral gauge boson couplings, $ZZ\gamma$ and $Z\gamma \gamma$, are investigated at linear $e^{+}{e}^{-}$ collider energies through the $Z\gamma$ production with longitudinal and transverse polarization states of the final Z boson. Because of high energy of linear electron- positron beams, initial state radiation (ISR) considerably changes the production cross section. We obtain an increase in the cross section by a factor of 2-3 due to ISR for transverse polarization and by a factor of 10-100 for longitudinal polarization states depending on the energy. We find the 95% C.L. limits on the CP conserving form factors $h_3^Z$, $h_4^Z$, $h_3^{\gamma }$ and $h_4^{\gamma }$ with integrated luminosity 500$f{b}^{-1}$ and $\sqrt{s}=$0.5, 1, 1.5 TeV energies. It is shown that the longitudinal polarization of the Z boson, together with ISR, can improve sensitivities by factors 2-3.

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• Model-independent study on the anomalous $ZZ\gamma$ and $Z\gamma \gamma$ couplings at the future muon collider
• CP violating effects in the decay Z -> mu^+mu^-gamma induced by ZZgamma and Zgammagamma couplings
• Probing the ZZgamma and Zgammagamma Couplings Through the Process e+e- --> nu anti-nu gamma
• The three channels of the process f_1 bar-f_1 H A --> 0 in the SANC framework
• Electroweak radiative corrections to the three channels of the process f_1 bar-f_1 ZA --> 0
• Non-diagonal contributions to $Z\gamma V^{\ast }$ vertex, polarizations and bounds on $Z\overline{t}q$ couplings
• The associated productions of the new gauge boson $B_H$ in the littlest Higgs model with a SM gauge boson via $e^{+}{e}^{-}$ collision
• Analysis of the anomalous quartic $WWWW$ couplings at the LHeC and the FCC-he