Beam-dump experiments for visibly decaying mediators hit an intrinsic sensitivity ceiling in the prompt-decay region that cannot be overcome by more data or better backgrounds, favoring compact portable setups.
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A minimal electrophilic ALP portal for SIMP pion dark matter widens the allowed parameter space, making an ALP mass of order 10 MeV viable and consistent with the X17 anomaly.
The authors combine PADME positron annihilation data with nuclear transition results to report a refined mass for the hypothetical X17 boson of 16.88 ± 0.05 MeV.
citing papers explorer
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Beam-Dump Ceiling and Its Experimental Implication: The Case of a Portable Experiment
Beam-dump experiments for visibly decaying mediators hit an intrinsic sensitivity ceiling in the prompt-decay region that cannot be overcome by more data or better backgrounds, favoring compact portable setups.
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Axion-Like Electrophilic Portal for Pion Dark Matter
A minimal electrophilic ALP portal for SIMP pion dark matter widens the allowed parameter space, making an ALP mass of order 10 MeV viable and consistent with the X17 anomaly.
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Combined Evidence for the $X_{17}$ Boson After PADME Results on Resonant Production in Positron Annihilation
The authors combine PADME positron annihilation data with nuclear transition results to report a refined mass for the hypothetical X17 boson of 16.88 ± 0.05 MeV.