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arXiv · 1703.06437

On the choice of beam polarization in $e^+e^-\to ZZ/Zγ$ and anomalous triple gauge-boson couplings

Rafiqul Rahaman·Ritesh K. Singh
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Abstract

The anomalous trilinear gauge couplings of $Z$ and $γ$ are studied in $e^+e^-\to ZZ/Zγ$ with longitudinal beam polarizations using a complete set of polarization asymmetries for the $Z$ boson. We quantify the goodness of the beam polarization in terms of the likelihood and find the best-choice of $e^-$ and $e^+$ polarizations to be ($+0.16$, $-0.16$), ($+0.09$, $-0.10$) and ($+0.12$, $-0.12$) for $ZZ$, $Zγ$ and combined processes, respectively. Simultaneous limits on anomalous couplings are obtained for these choices of beam polarizations using Markov-Chain--Monte-Carlo (MCMC) for an $e^+e^-$ collider running at $\sqrt{s}=500$ GeV and $\mathcal{L}=100$ fb$^{-1}$. We find the simultaneous limits for these beam polarizations to be comparable with each other and also comparable with the unpolarized beam case.

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Rafiqul Rahaman, Ritesh K. Singh. 2019-04-27. On the choice of beam polarization in $e^+e^-\to ZZ/Zγ$ and anomalous triple gauge-boson couplings. https://doi.org/10.1140/epjc%2Fs10052-017-5093-1

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