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Probing the anomalous triple gauge boson couplings in $e^+e^-\to W^+W^-$ using $W$ polarizations with polarized beams (1909.05496v2)

Published 12 Sep 2019 in hep-ph and hep-ex

Abstract: We study the anomalous $W+W-V$ ($V=\gamma,Z$) couplings in $e+e-\to W+W-$ using the complete set of polarization observables of $W$ boson with longitudinally polarized electron ($e-$) and positron ($e+$) beams. For the effective $W+W-V$ couplings, we use the most general Lorentz invariant form factor parametrization as well as $SU(2)\times U(1)$ invariant dimension-$6$ effective operators. We estimate simultaneous limits on the anomalous couplings using the Markov-Chain--Monte-Carlo (MCMC) method for an $e+e-$ collider running at center of mass energy of $\sqrt{s}=500$ GeV and the integrated luminosity of ${\cal L}=100$ fb${-1}$, $3.2$ ab${-1}$ and $4$ ab${-1}$. The best limits on the anomalous couplings are obtained for $e-$ and $e+$ polarization being $(\pm 0.8,\mp 0.6)$ for both $100$ fb${-1}$ and $3.2$ ab${-1}$ of luminosity.

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