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Title: Gravitational effects on measurements of the muon dipole moments

If one day the technology for muon storage rings permits sensitivity to precession at the order of 10 -8Hz, the local gravitational field of Earth can be a dominant contribution to the precession of the muon, which, if ignored, can fake the signal for a nonzero muon electric dipole moment (EDM). Specifically, the effects of Earth’s gravity on the motion of a muon’s spin is indistinguishable from it having a nonzero EDM of magnitude d μ~10 -29e cm in a storage ring with vertical magnetic field of -1T, which is significantly larger than the expected upper limit in the Standard Model, d μ ≲10 -36e cm. As a corollary, measurements of Earth’s local gravitational field using stored muons would be a unique test to distinguish classical gravity from general relativity with a bonafide quantum mechanical entity, i.e., an elementary particle’s spin.
Authors:
ORCiD logo [1]
  1. Univ. of California San Diego, La Jolla, CA (United States). Physics Dept.
Publication Date:
Grant/Contract Number:
SC0009919
Type:
Published Article
Journal Name:
Nuclear Physics. B
Additional Journal Information:
Journal Volume: 911; Journal Issue: C; Journal ID: ISSN 0550-3213
Publisher:
Elsevier
Research Org:
Univ. of California, San Diego, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
OSTI Identifier:
1294705
Alternate Identifier(s):
OSTI ID: 1423954

Kobach, Andrew. Gravitational effects on measurements of the muon dipole moments. United States: N. p., Web. doi:10.1016/j.nuclphysb.2016.08.011.
Kobach, Andrew. Gravitational effects on measurements of the muon dipole moments. United States. doi:10.1016/j.nuclphysb.2016.08.011.
Kobach, Andrew. 2016. "Gravitational effects on measurements of the muon dipole moments". United States. doi:10.1016/j.nuclphysb.2016.08.011.
@article{osti_1294705,
title = {Gravitational effects on measurements of the muon dipole moments},
author = {Kobach, Andrew},
abstractNote = {If one day the technology for muon storage rings permits sensitivity to precession at the order of 10-8Hz, the local gravitational field of Earth can be a dominant contribution to the precession of the muon, which, if ignored, can fake the signal for a nonzero muon electric dipole moment (EDM). Specifically, the effects of Earth’s gravity on the motion of a muon’s spin is indistinguishable from it having a nonzero EDM of magnitude dμ~10-29e cm in a storage ring with vertical magnetic field of -1T, which is significantly larger than the expected upper limit in the Standard Model, dμ ≲10-36e cm. As a corollary, measurements of Earth’s local gravitational field using stored muons would be a unique test to distinguish classical gravity from general relativity with a bonafide quantum mechanical entity, i.e., an elementary particle’s spin.},
doi = {10.1016/j.nuclphysb.2016.08.011},
journal = {Nuclear Physics. B},
number = C,
volume = 911,
place = {United States},
year = {2016},
month = {8}
}