Spin identification of the mono-Z${}^{\prime }$ resonance in muon-pair production at the ILC with simulated electron-positron collisions at $\sqrt{s}$ = 500 GeV

Abstract

In this analysis, we examine the angular distribution of low-mass dimuon pairs produced in simulated electron-positron collisions at the proposed International Linear Collider (ILC), which operates at a center-of-mass energy of 500 GeV and has an integrated luminosity of 4 ab\(^{-1}\). Our focus is on the cos\(θ_{\text{CS}}\) variable, which is defined in the Collins-Soper frame. In the Standard Model, the production of low-mass dimuon pairs is primarily driven by the Drell-Yan process, which exhibits a notable forward-backward asymmetry. However, many scenarios beyond the Standard Model predict different shapes for the cos\(θ_{\text{CS}}\) distribution. This angular distribution can be valuable for distinguishing between these models, especially in the event of observing excesses beyond the Standard Model expectations. We utilized the mono-Z\(^{\prime}\) model to interpret the simulated data. In the absence of any discoveries of new physics, we establish upper limits at the 95\% confidence level on the masses of various particles in the model, which includes the spin-1 \(Z^{\prime}\) boson and fermionic dark matter.

arXiv admin note: text overlap with arXiv:2311.13924

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