Preferred-Frame and CP-Violation Tests with Polarized Electrons

Details Preferred-Frame and CP-Violation Tests with Polarized Electrons Preferred-Frame and CP-Violation Tests with Polarized Electrons

2008-08-20

arxiv.org/abs/0808.2673v1

Phys.Rev.D78:092006,2008

Physics

High Energy Physics

High Energy Physics - Experiment

54 pages, 18 figures, Submitted to PRD

Scientific paper

10.1103/PhysRevD.78.092006

We used a torsion pendulum containing $\approx 10^{23}$ polarized electrons to search new interactions that couple to electron spin. We limit CP-violating interactions between the pendulum's electrons and unpolarized matter in the earth or the sun, test for rotation and boost-dependent preferred-frame effects using the earth's rotation and velocity with respect to the entire cosmos, and search for exotic velocity-dependent potentials between polarized electrons and unpolarized matter in the sun and moon. Finally, we find that the gravitational mass of an electron spinning toward the galactic center differs by less than about 1 part in $10^{21}$ from an electron spinning in the opposite direction. As a byproduct of this work, the density of polarized electrons in Sm$ $Co$_5$ was measured to be $(4.19\pm 0.19)\times 10^{22} {\rm cm}^{-3}$ at a field of 9.6 kG.

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