Dark-Sector Search via Pion-Produced η and η′ Mesons Decaying Invisibly in the NA64h Detector
Date Issued
2024-09
Author(s) USM
Lyubovitskij, V.E.
Mena Fredes, R.
Mena Yanssen, R.G.
DOI
10.1103/PhysRevLett.133.121803
Abstract
We present the first results from a proof-of-concept search for dark sectors via invisible decays of pseudoscalar eta and eta mesons in the NA64h experiment at the CERN SPS. Our novel technique uses the charge-exchange reaction of 50 GeV pi- on nuclei of
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