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(stat.)±4.0(sys.)]×10−5 rad/m is consistent with zero. This result improves the upper bounds on the neutron-matter coupling g2A by about three orders of magnitude for force ranges in the mm– μm regime.

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Published in Physics Letters B, v. 783, p. 227-233.

© 2018 The Authors. Published by Elsevier B.V.

This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

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C. Haddock, E. Anderson, W. Fox, I. Francis, J. Fry, K. Korsak, W. M. Snow, K. Steffen, and J. Vanderwerp acknowledge support from US National Science Foundation grants PHY-1306942 and PHY-1614545 and from the Indiana University Center for Spacetime Symmetries. C. Haddock acknowledges support from the US Department of Energy SCGSR Fellowship and the Japan Society for the Promotion of Science Fellowship. M. Sarsour acknowledges support from US Department of Energy grant DE-SC0010443. L. Barrón-Palos and M. Maldonado-Velázquez acknowledge support from PAPIIT-UNAM grants IN111913 and IG101016. W. M. Snow also acknowledges support from the Mainz Institute of Theoretical Physics(MITP) for its hospitality and its partial support during the completion of this work. H. Gardiner, D. Esposito, and J. Lieffers acknowledge support from the NSF Research Experiences for Undergraduates program NSF PHY-1156540. Funded by SCOAP3.