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Theory Center Seminar<br>
Monday, Nov. 25, 2013<br>
1:00 p.m. (coffee at 12:45 p.m.)<br>
CEBAF Center, <u><b>Room F113<br>
</b></u> <br>
Emilie Passemar <br>
Los Alamos National Laboratory<br>
<br>
<b>Eta -> 3 pi and Light Quark Masses </b><br>
<br>
Recently, several experimental collaborations have invested
considerable effort into new and more precise measurements of the
eta -> 3 pi decays. These experimental advances require
revisiting the corresponding theoretical analyses. In this talk, we
present a new calculation of the eta -> 3 pi decay amplitude
relying on dispersive methods. We show how the study of this decay
allows one to extract a fundamental parameter of the Standard Model,
namely the quark mass ratio (m_d<sup><span>^</span>2</sup>-m_u<sup><span>^</span>2</sup>)/(m_s<sup><span>^</span>2</sup>-\hat{m}<sup><span>^</span>2</sup>),
with good precision. We then discuss the possibility of extracting
the individual light quark masses.<br>
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