Pion and kaon electromagnetic form factors in a
effective Lagrangian
Yun Chang Shin1 - Bong Soo Han1 - Myung Ki Cheoun1,2 - K.S. Kim1 - Il-Tong Cheon1
1 Department of Physics, Yonsei University, Seoul, 120-749, Korea
2 IUCNSF, Seoul National University, 151-742 Korea
cheoun@phya.snu.ac.kr
Received: 20 December 1999 / Revised version: 19 August 2000
Communicated by A. Schäfer
Abstract
A SU(2) effective Lagrangian is extended to a
by including the vector and axial vector meson. With
this effective Lagrangian, electromagnetic form factors of charged
pion and kaon are calculated in both time- and space-like regions.
The pseudoscalar meson loops are taken into account. Good
agreement with experimental data is obtained for those form
factors and charged pseudoscalar meson radii. Decay widths of
and
are also
calculated and shown to agree with experimental data very well.
PACS
12.39.Fe Chiral Lagrangians - 12.40.Vv Vector-meson dominance - 13.40.Gp Electromagnetic form factors - 14.40.Ev Other strange mesons
Copyright Società Italiana di Fisica, Springer-Verlag 2000