Abstract
The proposed Circular Electron Positron Collider (CEPC) with a center-of-mass energy GeV will primarily serve as a Higgs factory. Additionally, it will offer good opportunities to search for new physics phenomena at low energies, which can be challenging with hadron colliders; however, these discoveries are highly motivated by theoretical models developed to explain, e.g., the relic abundance of dark matter. This paper presents sensitivity studies for chargino pair production by considering scenarios for both a Bino-like and a Higgsino-like neutralino as the lightest supersymmetric particle and using a full Monte Carlo (MC) simulation. By assuming systematic uncertainties at the level of 5%, the CEPC has the ability to discover chargino pair production up to the kinematic limit of for both scenarios. The results have a minor dependence on the reconstruction model and detector geometry. These results can also be considered as a reference and benchmark for similar searches at other proposed electron-positron colliders, such as the Future Circular Collider ee (FCC-ee) or the International Linear Collider (ILC), given the similar nature of the facilities, detectors, center-of-mass energies, and target luminosities.
Highlights
Supersymmetry (SUSY) [1–7] predicts new particles, each of whose spin differs by a half unit from their corresponding standard model (SM) particles
The first scenario is favored by dark matter arguments and the second scenario is motivated by naturalness considerations [11–13], but is a challenging experimental signature to search for due to the small mass splittings between next to lightest supersymmetric particle (NLSP) and lightest supersymmetric particle (LSP)
3.3 Chargino pair production search summary The studies presented in this paper demonstrate that the dis√covery sensitivity for electroweakinos with both a Binolike LSP and a Higgsino-like LSP can reach masses up to s/2 at Circular Electron Positron Collider (CEPC)
Summary
Supersymmetry (SUSY) [1–7] predicts new particles, each of whose spin differs by a half unit from their corresponding standard model (SM) particles. The absolute values of M1 and M2 parameters are considered to be near the weak scale and similar in magnitude, while the magnitude of μ is significantly larger, such that |M1| < |M2| |μ| In this case, the LSP χ10 is Bino-like χ10 and the next to lightest supersymmetric particle (NLSP) is part of a Wino-like doublet forming χ20 and χ1±. For the Higgsino-like LSP scenario, three reference points with tanβ of 30 and μ of 90 GeV, 106 GeV or 118 GeV are used in this paper, with theoretical cross sections at LO as computed by MadGraph of 1966 fb, 1522.9 fb and 681.2 fb respectively This analysis only considers the dominant SM background processes with final states with two leptons (electrons, muons or taus) and significant recoil mass. Processes ττ ννH,H → ττ ZZ or WW → ττνν ZZ → ττνν νZ,Z → ττ ZZ or WW → μ μνν ZZ → μμνν
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