On the pion decay constant

Details On the pion decay constant On the pion decay constant

2010-08-20

arxiv.org/abs/1008.3479v1

Phys.Lett.B693:122-128,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages, 3 figures. Accepted for publication in Phys. Lett. B

Scientific paper

10.1016/j.physletb.2010.08.021

The pion decay constant f_pi plays a crucial role in many areas of low energy particle physics. Its value may e.g. be deduced from experimental data on leptonic pion decays. Here, we provide comments on several aspects of this evaluation. In particular, we point out that at the present level of experimental accuracy, the value of f_pi is sensitive to the value of the pion mass chosen in its chiral expansion.

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