25-29 September 2017
Salamanca, Spain
Europe/Zurich timezone

Extraction of chiral order parameters from eta→3pi and pipi scattering

26 Sep 2017, 19:00
Auditorium Hall

Auditorium Hall

Poster QCD and hadron structure Poster session


Marián Kolesár (Charles University, Faculty of Mathematics and Physics)


The eta→3pi decays are a valuable source of information on low energy QCD. We present our updated results
for the extraction of the three flavor chiral symmetry breaking order parameters from these processes.
We use a Bayesian approach in the framework of resummed chiral perturbation theory to extract
information on the quark condensate and pseudoscalar decay constant in the chiral limit, as well
as the mass difference of the light quarks. We compare our results with recent CHPT and lattice
QCD fits and find some tension, as the eta→3pi data seem to prefer a larger ratio of the chiral order
parameters. The results also disfavor a very large value of the chiral decay constant, which was
found by some recent works.

Primary author

Marián Kolesár (Charles University, Faculty of Mathematics and Physics)

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