Constraints on anomalous spin-spin interactions from spin-exchange collisions

Abstract

Measured and calculated cross sections for spin-exchange between alkali atoms and noble gases (specifically sodium and helium) are used to constrain anomalous spin-dependent forces between nuclei at the atomic scale ($\sim 10^{-8}\mathrm{cm}$). Combined with existing stringent limits on anomalous short-range, spin-dependent couplings of the proton, the dimensionless coupling constant for a heretofore undiscovered axial vector interaction of the neutron arising from exchange of a boson of mass $\lesssim 100\mathrm{eV}$ is constrained to be $g_A^n/\sqrt{4\pi \hslash c}<2\times 10^{-3}$. Constraints are established for a velocity- and spin-dependent interaction $\propto \prn{\mathbf{I} \cdot \mathbf{v}} \prn{\mathbf{K} \cdot \mathbf{v}}$, where $\mathbf{I}$ and $\mathbf{K}$ are the nuclear spins of He and Na, respectively, and $\mathbf{v}$ is the relative velocity of the atoms. Constraints on torsion gravity are also considered.

6 pages, 4 figures

References in corpus (4)

• Unparticle Physics
• Spin-Dependent Macroscopic Forces from New Particle Exchange
• Constraints on Torsion from Lorentz Violation
• Preferred-Frame and CP-Violation Tests with Polarized Electrons

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