585 research outputs found
Wess-Zumino-Witten action and photons from the Chiral Magnetic Effect
We revisit the Chiral Magnetic Effect (CME) using the chiral Lagrangian. We
demonstrate that the electric-current formula of the CME is derived immediately
from the contact part of the Wess-Zumino-Witten action. This implies that the
CME could be, if observed, a signature for the local parity violation, but a
direct evidence for neither quark deconfinement nor chiral restoration. We also
discuss the reverse Chiral Magnetic Primakoff Effect, i.e. the real photon
production through the vertex associated with the CME, which is kinematically
possible for space-time inhomogeneous configurations of magnetic fields and the
strong theta angle. We make a qualitative estimate for the photon yield to find
that it comparable to the thermal photon.Comment: 5 pages, 1 figure; some discussions refine
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