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pion decay constant : ウィキペディア英語版 | pion decay constant In particle physics, the pion decay constant is the square root of the coefficient in front of the kinetic term for the pion in the low-energy effective action. It is dimensionally an energy scale and it determines the strength of the chiral symmetry breaking. The values are: : : Beware: There are several conventions which differ by factors of . The textbook by Weinberg uses the value 184 MeV. The textbook by Peskin and Schroeder uses the value 93 MeV. == References ==
# (Particle Data Group: W.-M. Yao ''et al.'', J. Phys. G 33, 1 (2006). ) # # (Particle Data Group: Decay constants of charged pseudoscalar mesons )
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