Search for the singlet vector-like lepton at future colliders

Liangliang Shang; Mengmeng Wang; Zhaoxia Heng; Bingfang Yang

doi:10.1140/epjc/s10052-021-09152-2

2024 Impact factor 4.8

Particles and Fields

Open Access

Eur. Phys. J. C (2021) 81: 415
https://doi.org/10.1140/epjc/s10052-021-09152-2

Regular Article - Theoretical Physics

Search for the singlet vector-like lepton at future $e^{+} e^{-}$ colliders

Liangliang Shang¹^,2, Mengmeng Wang¹^,2, Zhaoxia Heng¹^,2 and Bingfang Yang¹^,2^d

¹ School of Physics, Henan Normal University, 453007, Xinxiang, China
² National Demonstration Center for Experimental Physics Education, Henan Normal University, 453007, Xinxiang, China

^d yangbingfang@htu.edu.cn

Received: 4 September 2020
Accepted: 19 April 2021
Published online: 12 May 2021

Abstract

Searching for the new particles beyond the standard model (SM) is an important way to probe new physics beyond the SM. In one class of new particles there are nonchiral color singlet fermions that couple to the SM leptons, that is vector-like leptons (VLLs), which have been widely concerned in experiment and theory. The existing literature shows that the singlet VLLs suffer from a big difficult challenge for discovery at future proton-proton colliders. In this paper, we study the prospects of searching for the singlet VLLs in pure leptonic and fully hadronic channels at $e^{+} e^{-}$ $$e^+ e^-$$ colliders. We find that there is an opportunity for excluding the region $m_{τ^{' \pm}} \in$ $m_{\tau ^{\prime \pm }} \in$ [180 GeV, 240 GeV] with $L$ ${\mathcal {L}}$ $\in$ $\in$ [ $3.0 {fb}^{- 1}$ $3.0\hbox { fb}^{-1}$ , $14.9 {fb}^{- 1}$ $14.9\hbox { fb}^{-1}$ ] ([ $0.1 {fb}^{- 1}$ $0.1\hbox { fb}^{-1}$ , $0.3 {fb}^{- 1}$ $0.3\hbox { fb}^{-1}$ ]) at ILC of $\sqrt{s} = 500 GeV$ $\sqrt{s} = 500\ \hbox { GeV}$ , the region $m_{τ^{' \pm}} \in$ $m_{\tau ^{\prime \pm }} \in$ [240 GeV, 450 GeV] with $L \in$ ${\mathcal {L}} \in$ [ $9.9 {fb}^{- 1}$ $9.9\hbox { fb}^{-1}$ , $23.1 {fb}^{- 1}$ $23.1\hbox { fb}^{-1}$ ] ([ $0.2 {fb}^{- 1}$ $0.2\hbox { fb}^{-1}$ , $0.3 {fb}^{- 1}$ $0.3\hbox { fb}^{-1}$ ]) at ILC of $\sqrt{s} = 1000 GeV$ $\sqrt{s} = 1000\ \hbox { GeV}$ and the region $m_{τ^{' \pm}} \in$ $m_{\tau ^{\prime \pm }} \in$ [450 GeV, 700 GeV] with $L \in$ ${\mathcal {L}} \in$ [ $52.1 {fb}^{- 1}$ $52.1\hbox { fb}^{-1}$ , $197.9 {fb}^{- 1}$ $197.9\hbox { fb}^{-1}$ ] ([ $2.21 {fb}^{- 1}$ $2.21\hbox { fb}^{-1}$ , $4.5 {fb}^{- 1}$ $4.5\hbox { fb}^{-1}$ ]) at CLIC of $\sqrt{s} = 1500 GeV$ $\sqrt{s} = 1500\ \hbox {GeV}$ in the pure leptonic (fully hadronic) channel. It is more optimistic for excluding and discovering the singlet VLL through the fully hadronic channel at future high energy $e^{+} e^{-}$ $$e^+ e^-$$ colliders.

© The Author(s) 2021

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