Vector boson fusion and scattering results from CMS

TL;DR

This paper reports on measurements of vector boson scattering and fusion processes at the LHC using CMS data, including the first observation of certain electroweak production modes and constraints on new physics.

Contribution

It presents the first measurements and observations of specific vector boson scattering and fusion processes at 13 TeV, with improved constraints on beyond Standard Model physics.

Findings

First observation of electroweak same-sign WW production with 5.5 sigma significance

First measurement of Z boson fusion at 13 TeV

Stringent limits set on new physics scenarios in vector boson scattering

Abstract

Measurements on vector boson scattering in the same-sign WW and fully leptonic ZZ channel, and a measurement of vector boson fusion of a Z boson are summarized. The three measurements are based on a dataset of proton--proton collisions at $\sqrt{s}=13\,\mathrm{Te\hspace{-.08em}V}$ with an integrated luminosity of $35.9\,\mathrm{fb}^{-1}$ recorded by the CMS experiment. The first observation for the electroweak production of a pair of same-sign W bosons is reported with an observed (expected) significance of 5.5 (5.7) standard deviations. The first measurement of vector boson fusion of a Z boson at $\sqrt{s}=13\,\mathrm{Te\hspace{-.08em}V}$ is presented. The first measurement of the electroweak production of two Z bosons at the LHC is also presented, reporting a signal significance of 2.7 standard deviations (1.6 standard deviations expected). The data are in general agreement with the expectations from the standard model. Limits on physics beyond the standard model are presented in the vector boson scattering analyses, providing the most stringent constraints on such scenarios to date.