English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

A light scalar $\phi$ with mass $\lesssim 1$ GeV and muonic coupling$\mathcal{O}(10^{-3})$ would explain the 3.5 $\sigma$ discrepancy between theStandard Model (SM) muon $g-2$ prediction and experiment. Such a scalar can beassociated with a light remnant of the Higgs mechanism in the "dark" sector. Wesuggest $\phi\to l^+l^-$ bump hunting in $\mu\to e\nu\bar\nu\phi$,$\mu^-p\to\nu_\mu n\phi$ (muon capture), and $K^\pm\to \mu^\pm\nu\phi$ decaysas direct probes of this scenario. In a general setup, a potentially observablemuon electric dipole moment $\lesssim 10^{-23}\ e \cdot\textrm{cm}$ and leptonflavor violating decays $\tau\to\mu (e) \phi$ or $\mu \to e \phi$ can alsoarise. Depending on parameters, a deviation in BR($H\to\mu^+\mu^-$) from SMexpectations, due to Higgs coupling misalignment, can result. We illustrate howthe requisite interactions can be mediated by weak scale vector-like leptonsthat typically lie within the reach of future LHC measurements.

Implications of a Light "Dark Higgs" Solution to the $g_\mu-2$ Discrepancy