Abstract
This paper explores the physics reach of the proton–proton future circular collider (FCC-hh) and of the High-Energy LHC (HE-LHC) for searches of new particles produced in the s-channel and decaying to two high-energy leptons, jets (non-tops), tops or W/Z bosons. We discuss the expected discovery potential and exclusion limits for benchmark models predicting new massive particles that result in resonant structures in the invariant mass spectrum. We also present a detailed study of the HE-LHC potential to discriminate among different models, for a Z^{prime } that could be discovered by the end of high-luminosity LHC (HL-LHC).
Highlights
C (2019) 79:569 consistent with the reach of the LHC, but elude the LHC searches due to the stealthy nature of their final states or to very weak couplings leading to very low rates, or the BSM phenomena are tied to physics living at mass scales beyond the LHC reach
Hypothesis testing is performed using a modified frequentist method based on a profile likelihood that takes into account the systematic uncertainties as nuisance parameters that are fitted to the expected Monte Carlo
This paper had three main goals: (i) to determine the discovery reach of the FCC-hh and High-Energy LHC (HE-LHC) at the highest masses, Page 17 of 23 569 using as benchmarks several BSM models of s-channel resonance production, (ii) to define performance targets for the detectors, and (iii) to study the power of the HE-LHC to discriminate among different models of resonances that could be just visible at high-luminosity LHC (HL-LHC)
Summary
In order to explore and contrast the capabilities of future colliders to discover and examine the properties of possible new physics, a broad set of benchmark models needs to be studied. As in the SM, the Z in GUT models generally couple to all the familiar quarks and leptons and can populate simultaneously the various fermionic 2-body final states listed above at various predictable rates The measurement of these rates (as well as other associated observables) can be used to discriminate among the different Z possibilities after discovery, as will be discussed further below. Spin-2 graviton resonances occur in extra-dimensional scenarios that attempt to address the hierarchy problem, as in the case of the warped extra dimensional model of Randall and Sundrum (RS) [33] In such setups, the SM gauge fields and fermions are generally allowed to propagate in the 5-dimensional bulk [34,35,36,37,38] whereas EW symmetry breaking occurs at or near the TeV/SM brane via the usual Higgs mechanism. A K-factor of 2 is applied to all the background processes to account for higher order corrections and is considered to be very conservative
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