CP-odd interaction of axion with matter

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In a world with an axion the precise measurement of gravitational forces and checks of the equivalence principle at small distances, λ∼1 cm and less, could provide an additional test of CP symmetry. Using the chiral approach, we connect the strength of the CP-odd axion-nucleon vertex with the CP-odd pion-nucleon coupling for color electric dipole moments of quarks as a low-energy source of CP violation. Strong limits on CP-odd coupling gπNN coming from atomic electric dipole moments give the best limits on the long range force mediated by axions, Faxion/ Fgravity<2.10-10(1 cm/λ)2.

Original languageEnglish (US)
Article number097703
Pages (from-to)977031-977034
Number of pages4
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number9
StatePublished - Oct 7 1998
Externally publishedYes


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