On (g – 2)_μ from gauged $$\mathrm{U(1)_X}$$

Journal Article · 14 July 2022 · Journal of High Energy Physics (Online)

DOI: https://doi.org/10.1007/jhep07(2022)098 · OSTI ID:1976500

Greljo, Admir  ^[1]; Stangl, Peter ^[2]; Thomsen, Anders Eller ^[2]; Zupan, Jure ^[3]

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1. University of Bern (Switzerland); Univ. of Bern (Switzerland)
2. University of Bern (Switzerland)
3. University of Cincinnati, OH (United States)

We investigate an economical explanation for the (g – 2)_μ anomaly with a neutral vector boson from a spontaneously broken U(1)_X gauge symmetry. The Standard Model fermion content is minimally extended by 3 right-handed neutrinos. Using a battery of complementary constraints, we perform a thorough investigation of the renormalizable, quark flavor-universal, vector-like U(1)_X models, allowing for arbitrary kinetic mixing. Out of 419 models with integer charges not greater than ten, only 7 models are viable solutions, describing a narrow region in model space. These are either L_μ– L_τ or models with a ratio of electron to baryon number close to –2. The key complementary constraints are from the searches for nonstandard neutrino interactions. Furthermore, we comment on the severe challenges to chiral U(1)_X solutions and show the severe constraints on a particularly promising such candidate.

• Research Organization: University of Cincinnati, OH (United States)
• Sponsoring Organization: European Research Council (ERC); Swiss National Science Foundation (SNF); USDOE Office of Science (SC)
• Grant/Contract Number: SC0011784
• OSTI ID: 1976500
• Journal Information: Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 7 Vol. 2022; ISSN 1029-8479
• Publisher: Springer NatureCopyright Statement
• Country of Publication: United States
• Language: English