Abstract
Axion-like particles (ALPs) interacting with the Standard Model can be abundantly produced in proton beam fixed-target experiments. Looking for their displaced decays is therefore an effective search strategy for ALPs with a mass in the MeV to GeV range. Focusing on the benchmark models where the ALP interacts dominantly with photons or gluons, we show that the proposed DarkQuest experiment at Fermilab will be able to test parameter space which has been previously inaccessible. We pay particular attention to the self-consistency of gluon-coupled ALP production and decay calculations, which has been recently shown to be a problem in many existing predictions. We also apply these results to explore existing constraints in the ALP parameter space.
Highlights
Axions and axion-like particles (ALPs) are a generic feature of many theories of beyondStandard Model (BSM) physics
The effect of experimental selections outlined above on event acceptance is shown in figure 16 for ma = 0.5 GeV and two gluon-coupled Axion-like particles (ALPs) production mechanisms
The dimension-five ALP couplings are some of the leading candidates for BSM physics interacting with SM particles from the perspective of effective field theory
Summary
Axions and axion-like particles (ALPs) are a generic feature of many theories of beyondStandard Model (BSM) physics. The pNGB nature of axions ensures that they are technically natural, even if the physics associated with the global symmetry lies at a very high scale As a result, these particles can be the first messengers of the ultraviolet (UV) that can be accessible at experiments. [22, 23] we discuss the cancellation of unphysical parameters in chiral perturbation theory, extending some of their findings to three flavours and other interactions
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