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We study the weak decay of of the neutral pion to a neutrino-antineutrino pair, π0→νν̅, in the Skyrme model. In Bayron-free-space the process is forbidden by helicity while in a dense baryonic medium, the process becomes possible already to leading order of Gf due to the break-down of Lorentz symmetry in the background medium.Alexander C. Kalloniatis, Jonathan D. Carroll and Byung-Yoon Par

physical review. d. particles, fields, gravitation, and cosmology/physical review. d, particles, fields, gravitation, and cosmology

Neutral pion decay into<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>ν</mml:mi><mml:mover accent="true"><mml:mi>ν</mml:mi><mml:mo>¯</mml:mo></mml:mover></mml:math>in dense Skyrmion matter

Neutral pion decay intoνν¯in dense Skyrmion matter