Flavorful vector-like leptons and the lepton-flavor-violating decays Z → lilj

Dong Wan Li; Chong Xing Yue; Yue Qi Wang; Xiao Chen Sun

doi:10.1209/0295-5075/ac5360

All issues

Volume 137 / No 3 (February 2022)

EPL, 137 3 (2022) 34003

Abstract

Issue		EPL Volume 137, Number 3, February 2022


Article Number		34003
Number of page(s)		5
Section		Nuclear and plasma physics, particles and fields
DOI		https://doi.org/10.1209/0295-5075/ac5360
Published online		22 April 2022

EPL, 137 (2022) 34003

Flavorful vector-like leptons and the lepton-flavor-violating decays Z → l_il_j

Dong Wan Li¹^(a), Chong Xing Yue^(b), Yue Qi Wang¹^(c) and Xiao Chen Sun¹^(d)

¹ Department of Physics, Liaoning Normal University - Dalian 116029, PRC

^(a) lldddwww@163.com
^(b) cxyue@lnnu.edu.cn (corresponding author)
^(c) wyq13889702166@163.com
^(d) xcsun0315@163.com

Received: 5 November 2021
Accepted: 9 February 2022

Abstract

The singlet and doublet VLS models are one kind of interesting new physics scenarios, which predict the existence of the SU(2)_L singlet and doublet vector-like leptons (VLLs), respectively. Taking into account the constraints on these VLS models, we investigate their contributions to the LFV decays $Z\rightarrow l_il_j \left ( i\neq j\right )$ . Our numerical results show that, for the singlet VLS model, the values of the branching ratios $Br\left (Z\rightarrow \tau e \right )$ and $Br\left (Z\rightarrow \tau \mu \right )$ can be larger than $5\times10^{-9}$ in a wide range of the parameter space, which might be detected by CEPC/FCC-ee in the near future.

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