Sensitivity to longitudinal vector boson scattering and doubly charged Higgs boson production in $W^± W^± jj$ at future hadron colliders

We study the sensitivity to longitudinal vector boson scattering at a 27-, 50-, and 100-TeV pp collider using events containing two leptonically decaying same-electric-charge 𝑊 bosons produced in association with two jets. The baseline FCC-hh detector parametrization within the D<small>ELPHES</small> framework is used under the assumption of fully efficient pileup mitigation. A tightly constrained phase space with a dijet mass greater than 2 TeV is considered in order to suppress the impact of potential instrumental backgrounds. Based on this setup, the expected sensitivity to the production of longitudinally polarized same-sign 𝑊 boson pairs is evaluated. Additionally, expected limits are set on doubly charged Higgs bosons produced via vector boson fusion processes and decaying to same-sign 𝑊 boson pairs.. Authors: Apyan, Aram [Brandeis Univ., Waltham, MA (United States)] (ORCID:0000000294186656); Kelson, Samuel [Brandeis Univ., Waltham, MA (United States)] (ORCID:0009000367920143); Mwewa, Chilufya [Brookhaven National Laboratory (BNL), Upton, NY (United States)] (ORCID:0000000235040366); Pleier, Marc-André [Brookhaven National Laboratory (BNL), Upton, NY (United States)] (ORCID:0000000294613494); Nedic, Luka [Oxford Univ. (United Kingdom)]. DOE Contract: SC0012704; SC0013542. Subjects: 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS