Improved constraints on an axion-mediated force

Low mass pseudoscalars, such as the axion, can mediate macroscopic parity and time-reversal symmetry-violating forces. We searched for such a force between polarized electrons and unpolarized atoms using a novel, magnetically unshielded torsion pendulum. We improved the laboratory bounds on this for...

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Bibliographic Details
Published in:Physical review letters 2011-01, Vol.106 (4), p.041801-041801, Article 041801
Main Authors: Hoedl, S A, Fleischer, F, Adelberger, E G, Heckel, B R
Format: Article
Language:English
Subjects:
ATOMIC FORCE MICROSCOPY
ATOMS
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
ELECTRONS
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
LEPTONS
MASS
MEV RANGE
MICROSCOPY
PARITY
PARTICLE PROPERTIES
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
PSEUDOSCALARS
SYMMETRY
TORSION
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Summary:Low mass pseudoscalars, such as the axion, can mediate macroscopic parity and time-reversal symmetry-violating forces. We searched for such a force between polarized electrons and unpolarized atoms using a novel, magnetically unshielded torsion pendulum. We improved the laboratory bounds on this force by more than 10 orders of magnitude for pseudoscalars heavier than 1 meV and have constrained this force over a broad range of astrophysically interesting masses (10  μeV to 10 meV).
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.106.041801