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For a precise determination of the m_u and m_d quark masses, it is useful tocombine isospin symmetric results of lattice or sum rules QCD techniques withsome isospin breaking study performed in chiral perturbation theory (ChPT). Themost promising process for the later is $\eta \to 3\pi$ decay. However, thisprocess is affected by large chiral corrections and there are observeddiscrepancies between the values of Dalitz plot parameters stemming from thestandard ChPT computation of its amplitude and those experimentally measured.We describe here the method based on analytic dispersive representation whichattempts to obtain the information on the masses by taking this discrepancyinto account independently of its exact origin. Together with the results ofthis analysis we present a review of some other constraints on the light quarkmasses and conclude with values of the masses compatible with them.

Determination of the $m_u$ and $m_d$ quark masses from $\eta \to 3\pi$ decay