A search for possible long range spin dependent interactions of the neutron from exotic vector boson exchange

This is the authors' abstract. We don't add key points for this paper.

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 interactions would tilt the plane of polarization and develop a component along the neutron momentum. The result for the rotation angle , ϕ ′ = [ 2.8 ± 4.6 ( s t a t . ) ± 4.0 ( s y s . ) ] × 10 − 5 rad/m is consistent with zero. This result improves the upper bounds on the neutron-matter coupling g A 2 by about three orders of magnitude for force ranges in the mm– μm regime.