Advancing the phenomenology of GeV-scale axion-like particles

Abstract

Searches for axion-like particles (ALPs) with masses in the GeV range are a central objective of present and future Intensity Frontier experiments. Interpreting these searches demands a reliable description of ALP production in hadronic collisions and decay. The prescription currently adopted by the community (i) depends on parameters of unphysical chiral rotation used to match gluonic ALP interactions with the interactions in terms of hadronic bound states, (ii) misdescribes the mass scaling of the ALP flux, and neglects mixing with heavy pseudoscalar resonances. We introduce a framework that treats GeV-scale ALP interactions in a chiral-rotation-invariant manner, includes their mixing with heavier excitations $\pi (1300)$, $\eta (1295)$, and $\eta (1440)$, and properly describes their production channels. When applying our description to proton beam experiments, we find that existing bounds and projected sensitivities shift by up to an order of magnitude relative to earlier estimates. We further delineate the dominant theoretical uncertainties, which originate from the still-incomplete experimental knowledge of the spectrum of pseudoscalar excitations.

Typos corrected and discussion slightly extended compared to the published version; conclusions unchanged

References in corpus (19)

• Collider Probes of Axion-Like Particles
• A taste of dark matter: Flavour constraints on pseudoscalar mediators
• The Low-Energy Effective Theory of Axions and ALPs
• Flavor probes of axion-like particles
• FORESEE: FORward Experiment SEnsitivity Estimator for the LHC and future hadron colliders
• Consistent treatment of axions in the weak chiral Lagrangian
• Heavy QCD Axion in $b\to s$ transition: Enhanced Limits and Projections
• Dark Scalars and Heavy Neutral Leptons at DarkQuest
• Dark Sector Production via Proton Bremsstrahlung
• Sensitivities to feebly interacting particles: public and unified calculations
• Axion-like Particle Searches at DarkQuest
• Phenomenology of axion-like particles with universal fermion couplings -- revisited
• Probing long-lived axions at the KOTO experiment
• Search for a long-lived spin-0 mediator in $b\to s$ transitions at the Belle II experiment
• Searches for long-lived dark photons at proton accelerator experiments
• LHCb potential to discover long-lived new physics particles with lifetimes above 100 ps
• Ordinary and exotic mesons in the extended Linear Sigma Model
• Wess-Zumino-Witten Interactions of Axions
• Search for hadronic decays of feebly-interacting particles at NA62

Cited by in corpus (5)

• Wess-Zumino-Witten Interactions of Axions: Three-Flavor
• Comparable Dark Matter and Baryon energy densities from Dark Grand Unification
• Nucleosynthesis and CMB bounds on photophilic ALPs: a fresh look
• Sweeping the pion chimney for axion-like particles with KOTO
• Di-decay signature of new physics particles at intensity frontier experiments