Spin rotation by Earthʼs gravitational field in a “frozen-spin” ring

Detailed calculations of spin rotation by the Earthʼs gravitational field in a frozen-spin ring are presented in three different coordinate systems and used (a) to show that the systematic error caused by gravitation in a proposed electric dipole moment measurement can be unambiguously determined, a...

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Bibliographic Details
Published in:Physics letters. A 2012-10, Vol.376 (45), p.2822-2829
Main Authors: Orlov, Yuri, Flanagan, Eanna, Semertzidis, Yannis
Format: Article
Language:English
Subjects:
Electric dipole moment
Frozen-spin storage ring
Gravitation
Magic momentum
Particle spin
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Summary:Detailed calculations of spin rotation by the Earthʼs gravitational field in a frozen-spin ring are presented in three different coordinate systems and used (a) to show that the systematic error caused by gravitation in a proposed electric dipole moment measurement can be unambiguously determined, and (b) to propose measuring the spin-gravity effect in a dedicated frozen-spin ring using electrons. ► Earthʼs gravity effect on particle spin in a “frozen-spin” ring is calculated. ► The coordinate systems used affect observed spin rotations in the vertical plane. ► The resulting ambiguity can be avoided by using a purely electric ring. ► The main systematic error in EDM measurement can thereby be significantly reduced. ► Spin-gravity coupling can be measured in such a ring.
ISSN:0375-9601
1873-2429
DOI:10.1016/j.physleta.2012.08.011