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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 [[chiral perturbation theory|low-energy effective action]]. It is dimensionally an [[energy scale]] and it determines the strength of the [[chiral symmetry breaking]]. The values are: | |||
:<math>f_{\pi^{\pm}} = 130.41 \pm 0.03 \pm 0.20~\mbox{MeV}</math> | |||
:<math>f_{\pi^{0}} = 130 \pm 5~\mbox{MeV}</math> | |||
Beware: There are several conventions which differ by powers of <math>\scriptstyle \sqrt{2}</math>. The textbook by Weinberg uses the value 184 MeV. The textbook by Peskin and Schroeder uses the value 93 MeV. | |||
== References == | |||
# [http://stacks.iop.org/JPhysG/33/1 Particle Data Group: W.-M. Yao ''et al.'', J. Phys. G 33, 1 (2006).] | |||
# {{cite book | author=Griffiths, David J. | title=Introduction to Elementary Particles | publisher=Wiley, John & Sons, Inc | year=1987 | isbn=0-471-60386-4}} | |||
# [http://pdg.lbl.gov/2012/reviews/rpp2012-rev-pseudoscalar-meson-decay-cons.pdf Particle Data Group: Decay constants of charged pseudoscalar mesons] | |||
== External links == | |||
# [http://pdg.lbl.gov Particle Data Group & WWW edition of ''Review of Particle Physics''] | |||
[[Category:Quantum chromodynamics]] | |||
{{particle-stub}} | |||
Revision as of 15:36, 2 November 2013
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 powers 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).
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