Model independent study for the anomalous quartic WWγγ couplings at future electron-proton colliders

Abstract

The Large Hadron Electron Collider and the Future Circular Collider-hadron electron with high center-of-mass energy and luminosity allow to better understand the Standard Model and to examine new physics beyond the Standard Model in the electroweak sector. Multi-boson processes permit for a measurement of the gauge boson self-interactions of the Standard Model that can be used to determine the anomalous gauge boson couplings. For this purpose, we present a study of the process ep→νeγγj at the Large Hadron Electron Collider with center-of-mass energies of 1.30, 1.98 TeV and at the Future Circular Collider-hadron electron with center-of-mass energies of 7.07, 10 TeV to interpret the anomalous quartic WWγγ gauge couplings using a model independent way in the framework of effective field theory. We obtain the sensitivity limits at 95% Confidence Level on 13 different anomalous couplings arising from dimension-8 operators. The best limit in fMi/Λ4 (i=0,1,2,3,4,5,7) parameters is obtained for fM2/Λ4 parameter while the best sensitivity derived on fTi/Λ4 (i=0,1,2,5,6,7) parameters is obtained for fT5/Λ4. In addition, this study is the first report on the anomalous quartic couplings determined by effective Lagrangians at ep colliders.