57 citations · 155 across the 8 of their papers we have counts for
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Determination of the quark mass ratio from
Stefan Lanz
The decay proceeds exclusively through isospin violating operators and is therefore an excellent probe to examine the strength of isospin breaking in the strong interact…
Dispersive analysis of
Gilberto Colangelo, Stefan Lanz, Heinrich Leutwyler +1
The dispersive analysis of the decay is reviewed and thoroughly updated with the aim of determining the quark mass ratio ~. With the nu…
The decay : study of the Dalitz plot and extraction of the quark mass ratio
Gilberto Colangelo, Stefan Lanz, Heinrich Leutwyler +1
The amplitude is sensitive to the quark mass difference and offers a unique way to determine the quark mass ratio f…
Leading logarithms in N-flavour mesonic Chiral Perturbation Theory
Johan Bijnens, Karol Kampf, Stefan Lanz
We extend earlier work on leading logarithms in the massive nonlinear O(n) sigma model to the case of SU(N)xSU(N)/SU(N) which coincides with mesonic chiral perturbation theory for…
Eta --> 3 pi and quark masses
Stefan Lanz
In recent years, the decay eta --> 3 pi has received considerable attention from experimental and theoretical side. It is of particular theoretical interest because it allows for t…
Leading logarithms in the anomalous sector of two-flavour QCD
Johan Bijnens, Karol Kampf, Stefan Lanz
We add the Wess-Zumino-Witten term to the N=3 massive nonlinear sigma model and study the leading logarithms in the anomalous sector. We obtain the leading logarithms to six loops…
A New Dispersive Analysis of eta --> 3 pi
Gilberto Colangelo, Stefan Lanz, Emilie Passemar
We present a new dispersive analysis of the isospin breaking decay eta --> 3 pi. The resulting representation of the decay amplitude allows us to determine the quark mass double ra…