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Searching for Hidden Neutrons with a Reactor Neutrino Experiment: Constraints from the STEREO Experiment

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arxiv 2111.01519 v2 pith:VDUDMGSF submitted 2021-11-02 hep-ex nucl-ex

Searching for Hidden Neutrons with a Reactor Neutrino Experiment: Constraints from the STEREO Experiment

classification hep-ex nucl-ex
keywords neutronexperimenthiddenexperimentslimitmatterneutrinoneutrons
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Different extensions of the standard model of particle physics, such as braneworld or mirror matter models, predict the existence of a neutron sterile state, possibly as a dark matter candidate. This Letter reports a new experimental constraint on the probability $p$ for neutron conversion into a hidden neutron, set by the STEREO experiment at the high flux reactor of the Institut Laue-Langevin. The limit is $p<3.1\times 10^{-11}$ at $95 \%$ C.L. improving the previous limit by a factor 13. This result demonstrates that short-baseline neutrino experiments can be used as competitive passing-through-walls neutron experiments to search for hidden neutrons.

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