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

6533b82bfe1ef96bd128cd66

RESEARCH PRODUCT

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

Johan Bijnens P. Talavera G. Amoros G. Amoros

subject

Quark Physics Quantum chromodynamics Nuclear and High Energy Physics Particle physics Chiral perturbation theory [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex]Meson Basis (linear algebra)010308 nuclear & particles physics High Energy Physics::Phenomenology FOS: Physical sciences 01 natural sciences Pseudoscalar High Energy Physics - Phenomenology High Energy Physics - Phenomenology (hep-ph)Isospin 0103 physical sciences [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]010306 general physics Mixing (physics)

description

The procedure to calculate masses and matrix-elements in the presence of mixing of the basis states is explained in detail. We then apply this procedure to the two-loop calculation in Chiral Perturbation Theory of pseudoscalar masses and decay constants including quark mass isospin breaking. These results are used to update our analysis of $K_{\ell4}$ done previously and obtain a value of $m_u/m_d$ in addition to values for the low-energy-constants $L_i^r$.

year	journal	country	edition	language
2001-01-12

http://hal.in2p3.fr/in2p3-00018858

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