Affordable Access

Download Read

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

  • [Phys:Hexp] Physics/High Energy Physics - Experiment
  • [Phys:Hexp] Physique/Physique Des Hautes Energies - Exp√©Rience


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 $L_i^r$.

There are no comments yet on this publication. Be the first to share your thoughts.