QCD isospin breaking in meson masses, decay constants and quark mass ratios

Authors
Amoros, G Bijnens, J Talavera, P
Citation
G. Amoros et al., QCD isospin breaking in meson masses, decay constants and quark mass ratios, NUCL PHYS B, 602(1-2), 2001, pp. 87-108
Citations number
72
Categorie Soggetti
Physics
Journal title
NUCLEAR PHYSICS B
ISSN journal
05503213 → ACNP
Volume
602
Issue
1-2
Year of publication
2001
Pages
87 - 108
Database
ISI
SICI code
0550-3213(20010521)602:1-2<87:QIBIMM>2.0.ZU;2-#
Abstract
The procedure to calculate masses and matrix-elements in the presence of mi xing of the basis states is explained in detail. We then apply this procedu re to the two-loop calculation in Chiral Perturbation Theory of pseudoscala r masses and decay constants including quark mass isospin breaking. These r esults are used to update our analysis of K-l4 done previously and obtain a value of m(u)/m(d) in addition to values for the low-energy-constants L-i( r). (C) 2001 Published by Elsevier Science B.V.