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Journal Articles Nuclear Physics B Year : 2001

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

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G. Amoros
• Function : Author
J. Bijnens
P. Talavera
• Function : Author

#### Abstract

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 $L_i^r$.

### Dates and versions

in2p3-00018858 , version 1 (10-07-2001)

### Identifiers

• HAL Id : in2p3-00018858 , version 1

### Cite

G. Amoros, J. Bijnens, P. Talavera. QCD isospin breaking in meson masses, decay constants and quark mass ratios. Nuclear Physics B, 2001, 602, pp.87-108. ⟨in2p3-00018858⟩

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