Abstract
Longitudinal vector boson scattering provides an important probe of electroweak symmetry breaking, bringing sensitivity to physics beyond the Standard Model as well as constraining properties of the Higgs boson. It is a difficult process to study due to the small production cross section and challenging separation of the different polarization states. We study the sensitivity to longitudinal $WV$ vector boson scattering at the high-luminosity Large Hadron Collider in semileptonic final states. While these are characterized by larger background contributions compared to fully leptonic final states, they benefit from a higher signal cross section due to the enhanced branching fraction. We determine the polarization through full reconstruction of the event kinematics using the $W$ boson mass constraint and through the use of jet substructure. We show that with these techniques sensitivities around three standard deviations at the HL-LHC are achievable, which makes this channel competitive with its fully leptonic counterparts.
Highlights
The study of longitudinal vector boson scattering (VBS) processes remains a long-standing, yet unattained, milestone of high energy physics [1]
Decay is reconstructed via two separate small-radius jets) and ZVjj semileptonic final states will contribute to establishing longitudinal VBS in semileptonic final states, our results can be seen as a lower limit on the expected sensitivity at the HL-Large Hadron Collider (LHC)
We have studied the prospects for measuring longitudinal VBS WV production at the HL-LHC using the semi-leptonic final state where the V boson hadronic decay products are boosted into a single large-radius jet
Summary
The study of longitudinal vector boson scattering (VBS) processes remains a long-standing, yet unattained, milestone of high energy physics [1]. The expected significant impact of pileup at the HL-LHC is mitigated by using track-based observables, and jet substructure techniques are deployed to improve V boson reconstruction As both the resolved WVjj channel (where the hadronic V decay is reconstructed via two separate small-radius jets) and ZVjj semileptonic final states will contribute to establishing longitudinal VBS in semileptonic final states, our results can be seen as a lower limit on the expected sensitivity at the HL-LHC. Four different polarization states are produced at leading order in QCD: both bosons are longitudinally polarized ðWLVLÞ, both transversely polarized (WTVT), or a mixture (WTVL and WLVT) These polarized samples are simulated with the helicity eigenstates defined in the WV center-of-mass reference frame [43]. All signal and background processes are reconstructed using a generic detector in the Delphes simulation framework [47], modeled after the ATLAS detector in the HL-LHC [48]
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