title: Short-Range, Spin-Dependent Interactions of Electrons: A Probe for Exotic Pseudo-Goldstone Bosons.
abstract: We used a torsion pendulum and rotating attractor with 20-pole electron-spin distributions to probe dipole-dipole interactions mediated by exotic pseudo-Goldstone bosons with m(b)c(2)≤500 μeV and coupling strengths up to 14 orders of magnitude weaker than electromagnetism. This corresponds to symmetry-breaking scales F≤70 TeV, the highest reached in any laboratory experiment. We used an attractor with a 20-pole unpolarized mass distribution to improve laboratory bounds on CP-violating monopole-dipole forces with 1.5 μeV<m(b)c(2)<400 μeV by up to a factor of 1000.
authors.affiliation: Center for Experimental Nuclear Physics and Astrophysics, Box 354290, University of Washington, Seattle, Washington 98195-4290, USA.
authors.forename: W A
authors.initials: WA
authors.lastname: Terrano
authors.affiliation: Center for Experimental Nuclear Physics and Astrophysics, Box 354290, University of Washington, Seattle, Washington 98195-4290, USA.
authors.forename: E G
authors.initials: EG
authors.lastname: Adelberger
authors.affiliation: Center for Experimental Nuclear Physics and Astrophysics, Box 354290, University of Washington, Seattle, Washington 98195-4290, USA.
authors.forename: J G
authors.initials: JG
authors.lastname: Lee
authors.affiliation: Center for Experimental Nuclear Physics and Astrophysics, Box 354290, University of Washington, Seattle, Washington 98195-4290, USA.
authors.forename: B R
authors.initials: BR
authors.lastname: Heckel