Abstract
We study the polarization of positively charged W's in the scattering of massive electroweak bosons at hadron colliders. We rely on the separation of weak boson polarizations in the gauge-invariant, doubly-resonant part of the amplitude in Monte Carlo simulations. Polarizations depend on the reference frame in which they are defined. We discuss the change in polarization fractions and in kinematic distributions arising from defining polarization vectors in two different reference frames which have been employed in recent experimental analyses.
Highlights
Vector Boson Scattering (VBS) at the LHC represents a crucial process for both Standard Model (SM) analyses and for Beyond-the-Standard-Model (BSM) searches
We discuss the change in polarization fractions and in kinematic distributions arising from defining polarization vectors in two different reference frames which have been employed in recent experimental analyses
This strongly limits the search for kinematic variables which are sensitive to vector boson polarizations
Summary
Vector Boson Scattering (VBS) at the LHC represents a crucial process for both Standard Model (SM) analyses and for Beyond-the-Standard-Model (BSM) searches. It is essential to devise a good definition of polarized signals at the theoretical level, and to investigate their phenomenology, in order to identify observables which allow the efficient experimental separation of polarized processes at the LHC Both CMS and ATLAS have measured the W polarization fractions in the W + jets [13, 14] channel and in t tevents [15,16,17]. In the fully-leptonic W +W + scattering, like in W +W −, the presence of two neutrinos in the final state inhibits the experimental reconstruction of the center-of-mass frame of each W boson This strongly limits the search for kinematic variables which are sensitive to vector boson polarizations. Tributions of kinematic variables that are observable at the LHC
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