Electroweak precision test of axion-like particles

Abstract

We study the contributions of an axion-like particle to the electroweak precision observables. The particle is assumed to couple with the standard model electroweak gauge bosons. We provide the formulae of the contributions valid for any mass of the axion-like particle. It is found that the effects arise not only via the oblique $S$ and $U$ parameters but also via radiative corrections to the gauge couplings. Besides, the decay of $Z\to a\gamma$ affects the total width of the $Z$ boson. All of those contributions are considered simultaneously in the global fit analysis of the electroweak precision observables. Also, we discuss the recent CDF result of the $W$-boson mass measurement. Since the model is tightly constrained by flavor and collider constraints, it is found that the discrepancy from the standard model prediction is solved only when the axion-like particle is heavier than 500 GeV and its coupling to di-photon is suppressed.

arXiv comment32 pages, 8 figures, version accepted by JHEP

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Cited by in corpus (6)

• Probing the Interactions of Axion-Like Particles with Electroweak Bosons and the Higgs Boson in the High Energy Regime at LHC
• Limits on ALP-neutrino couplings from loop-level processes
• Running beyond ALPs: shift-breaking and CP-violating effects
• Sensitivities to New Resonance Couplings to $W$-Bosons at the LHC
• Gravitational Signatures of Axion Dark Matter via Parity-Violating Interactions
• Enhanced extragalactic photon flux by PBH in a stimulated axion/ALP decay scenario