A New Dispersive Analysis of eta --> 3 pi
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✦ hep-ph
hep-ex
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analysisdecaydispersiveallowsamplitudebreakingdeterminediscuss
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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 ratio Q and we find as a preliminary result Q = 22.3 +/- 0.4. Finally, we discuss a number of improvements that we intend to implement in the future.
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