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We report the first experimental upper bound to our knowledge on possiblein-matter torsion interactions of the neutron from a recent search for parityviolation in neutron spin rotation in liquid He-4. Our experiment constrains acoefficient $\zeta$ consisting of a linear combination of parameters involvingthe time components of the torsion fields $T^\mu$ and $A^\mu$ from the nucleonsand electrons in helium which violates parity. We report an upper bound of$|\zeta|<9.1x10^{-23}$ GeV at 68% confidence level and indicate other physicalprocesses that could be analyzed to constrain in-matter torsion.

A First Experimental Limit on In-matter Torsion from Neutron Spin Rotation in Liquid He-4