Strong CP Violation in Large Scale Magnetic Fields

Details Strong CP Violation in Large Scale Magnetic Fields Strong CP Violation in Large Scale Magnetic Fields

Nov 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aipc..964..324f&link_type=abstract

QCDatWORK 2007: International Workshop on Quantum Chromodynamics: Theory and Experiment. AIP Conference Proceedings, Volume 964

Other

Charge Conjugation, Parity, Time Reversal, And Other Discrete Symmetries, Other Nonperturbative Calculations

Scientific paper

We explore the possibility of improving on the present experimental bounds on Strong CP violation, by studying processes in which the smallness of θ is compensated by the presence of some other very large scale. In particular, we study the response of the θ vacuum to large-scale magnetic fields, whose correlation lengths can be as large as the size of galaxy clusters. We find that, if strong interactions break CP, an external magnetic field would induce an electric vacuum polarization along the same direction. As a consequence, u,d and d,u quarks would accumulate in the opposite regions of the space, giving raise to an electric dipole moment. We estimate the magnitude of this effect both at T = 0 and for 0

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