A Search for Possible Long Range Spin Dependent Interactions of the Neutron From Exotic Vector Boson Exchange

Abstract

We present a search for possible spin dependent interactions of the neutron with matter through exchange of spin 1 bosons with axial vector couplings as envisioned in possible extensions of the Standard Model. This was sought using a slow neutron polarimeter that passed transversely polarized slow neutrons by unpolarized slabs of material arranged so that this interaction would tilt the plane of polarization and develop a component along the neutron momentum. The result for the rotation angle, $ϕ'_{V_5} = [2.8\pm\,4.6(stat.)\pm\,4.0(sys.)]\times 10^{-5}~\mbox{rad/m}$ is consistent with zero. This result improves the upper bounds on the neutron-matter coupling $g_A^2$ from such an interaction by about three orders of magnitude for force ranges in the mm-$\mu$m regime.

10 pages, 3 figures

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• Tests of Fundamental Quantum Mechanics and Dark Interactions with Low Energy Neutrons -- Extended Version
• Particle Physics at the European Spallation Source
• Spin-dependent exotic interactions
• Using Earth to Search for Long-Range Spin-Velocity Interactions
• Searching for New Interactions at Sub-micron Scale Using the Mossbauer Effect
• Internal Consistency of Neutron Coherent Scattering Length Measurements from Neutron Interferometry and from Neutron Gravity Reflectometry for Exotic Yukawa Analyses
• A Ramsey Neutron-Beam Experiment to Search for Ultralight Axion Dark Matter at the ESS