Abstract
Measuring longitudinally polarized vector boson scattering in, e.g., the ZZ channel is a promising way to investigate the unitarization scheme from the Higgs and possible new physics beyond the Standard Model. However, at the LHC, it demands the end of the HL-LHC lifetime luminosity, 3000/fb, and advanced data analysis technique to reach the discovery threshold due to its small production rates. Instead, there could be great potential for future colliders. In this paper, we perform a Monte Carlo study and examine the projected sensitivity of longitudinally polarized ZZ scattering at a TeV scale muon collider. We conduct studies at 14 TeV and 6 TeV muon colliders respectively and find that a 5 standard deviation discovery can be achieved at a 14 TeV muon collider, with 3000/fb of data collected. While a 6 TeV muon collider can already surpass HL-LHC, reaching 2 standard deviations with around 4000/fb of data. The effect from lepton isolation and detector granularity is also discussed, which may be more obvious at higher energy muon colliders, as the leptons from longitudinally polarized Z decays tend to be closer.
Highlights
The discovery [1,2] and property measurements [3] of the Higgs boson marked a triumph of the Standard Model (SM) of particle physics and the Large Hadron Collider (LHC)
Measuring longitudinally polarized vector boson scattering in, e.g., the ZZ channel is a promising way to investigate the unitarization scheme from the Higgs and possible new physics beyond the Standard Model
We conduct studies at 14 and 6 TeV muon colliders respectively and find that a 5 standard deviation discovery can be achieved at a 14 TeV muon collider, with 3000 fb−1 of data collected
Summary
The discovery [1,2] and property measurements [3] of the Higgs boson marked a triumph of the Standard Model (SM) of particle physics and the Large Hadron Collider (LHC). Among the critical topics, measuring the vector boson scattering (VBS) processes and especially its longitudinally polarized component (the LL component) is extremely important yet very demanding. Many VBS studies have been performed at the LHC, including the discoveries and measurements of WÆWÆ [5,6,7], WÆZ [7,8,9], ZZ [10,11], Zγ [12,13,14,15], and Wγ [16,17]. Based on the full simulation of samples with the upgraded Compact Muon Solenoid (CMS) detector at the 14 TeV HL-LHC [23,24,25], the expected significance for an integrated luminosity of 3000 fb−1 is estimated to be 2.7 and 1.4 standard deviations (σ), for the LL VBS WÆWÆ and ZZ, respectively.
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