Title: Vectorlike leptons: Muon $g-2$ anomaly, lepton flavor violation, Higgs boson decays, and lepton nonuniversality

Abstract

Here, we discuss the Standard Model (SM) with one family of vectorlike (VL) leptons, which couple to all three families of the SM leptons. We study the constraints on this model coming from the heavy-charged lepton mass bound, electroweak precision data, the muon anomalous magnetic moment, lepton flavor violation, Higgs boson decay constraints, and a recently measured lepton nonuniversality observable, $R_{K^{*0}}$, along with $R_K$. We find that the strongest constraints are coming from the muon $g-2$, $R_{\mu \mu }=\mathrm{\Gamma }(h\to \mu \mu )/\mathrm{\Gamma }(h\to \mu \mu {)}_{\mathrm{SM}}$, $R_{\gamma \gamma }$ and $\mathrm{BR}(\mu \to e\gamma )$. While VL leptons couple to all three families of the SM leptons, the ratio of electron-VL to muon-VL coupling is constrained to be $〈{\lambda }_e/{\lambda }_{\mu }〉\lesssim {10}^{-4}$. We also find that this model cannot fit the lepton nonuniversality discrepancies.

Authors:

Poh, Zijie ^[1]; Raby, Stuart ^[1]

---

+ Show Author Affiliations

1. The Ohio State Univ., Columbus, OH (United States)

Publication Date:

Wed Jul 26 00:00:00 EDT 2017

Research Org.:

The Ohio State Univ., Columbus, OH (United States)

Sponsoring Org.:

USDOE Office of Science (SC), High Energy Physics (HEP)

OSTI Identifier:

1602496

Alternate Identifier(s):

OSTI ID: 1372933

Grant/Contract Number:  

SC0011726

Resource Type:

Accepted Manuscript

Journal Name:

Physical Review D

Additional Journal Information:

Journal Volume: 96; Journal Issue: 1; Journal ID: ISSN 2470-0010

Publisher:

American Physical Society (APS)

Country of Publication:

United States

Language:

English

Subject:

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS