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<span style="font-family: Calibri, Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255)">Dear all,<br>
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<span style="color: rgb(0, 0, 0); font-family: Arial, Helvetica, sans-serif; font-size: medium; background-color: rgb(255, 255, 255); display: inline !important;">Here is a reminder for</span><span style="color: rgb(0, 0, 0); font-family: Arial, Helvetica, sans-serif; font-size: medium; background-color: rgb(255, 255, 255);"> seminars</span><span style="color: rgb(0, 0, 0); font-family: Arial, Helvetica, sans-serif; font-size: medium; background-color: rgb(255, 255, 255);"> </span><span style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: medium; background-color: rgb(255, 255, 255)"><span><span><span><span style="color: rgb(0, 0, 0);">next</span></span></span></span></span><span style="color: rgb(0, 0, 0); font-family: Arial, Helvetica, sans-serif; font-size: medium; background-color: rgb(255, 255, 255);"> </span><span style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: medium; background-color: rgb(255, 255, 255)"><span><span><span style="color: rgb(0, 0, 0);">week</span></span></span></span><span style="color: rgb(0, 0, 0); font-family: Arial, Helvetica, sans-serif; font-size: medium; background-color: rgb(255, 255, 255); display: inline !important;">:</span><br>
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</b></u></span><span style="margin: 0px; font-size: 12pt; color: rgb(0, 0, 0);"><u><b>Theory seminar:</b></u></span><br>
<span style="margin: 0px; font-size: 12pt; color: rgb(0, 0, 0);">Monday, Oct 14, 1:00PM, Room L102</span></font></div>
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<font size="3"><span style="margin: 0px; font-size: 12pt"><span style="font-size: 16px; background-color: rgb(255, 255, 255); display: inline !important; color: rgb(0, 0, 0);">Sergi Gonzalez-Solis (Illinois U.), "Light lessons from tau decays"</span></span></font></div>
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<font size="3"><span style="margin: 0px; font-size: 12pt"><span style="font-size: 16px; background-color: rgb(255, 255, 255); color: rgb(0, 0, 0);">Abstract:</span></span></font></div>
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<font size="3"><span style="margin: 0px; font-size: 12pt"><span style="font-size: 16px; background-color: rgb(255, 255, 255)"><span style="font-size: 12pt; color: rgb(0, 0, 0);">The tau is the only lepton massive enough to decay into hadrons. </span></span></span></font><span style="font-size: 12pt; color: rgb(0, 0, 0);">Its
semileptonic decays provide a privileged scenario to study low-energy effects of the strong interactions under rather clean conditions. </span><span style="font-size: 12pt; color: rgb(0, 0, 0);">Such advantageous framework is used to improve our understanding
of the hadronization of QCD currents, to study meson form factors and to extract the physical parameters of the intermediate resonances produced in the decay. </span><span style="font-size: 12pt; color: rgb(0, 0, 0);">In this talk, we will review the status
of the hadronic tau decay modes into two mesons and study the higher-multiplicity decay $\tau^{-}\to(3\pi)^{-}\nu_{\tau}$. </span><span style="font-size: 12pt; color: rgb(0, 0, 0);">Our theoretical description of the meson from factors that come up into play
is based on Chiral Perturbation Theory supplemented by constraints posed by analyticity and unitarity through dispersion relations. </span><font size="3"><span style="margin: 0px; font-size: 12pt"><span style="font-size: 16px; background-color: rgb(255, 255, 255)"><span style="font-size: 12pt; color: rgb(0, 0, 0);">The
fantastic possibilities offered by the Belle-II experiment to study tau physics and low multiplicity final states with high precision make these studies of timely interest.</span></span></span></font></div>
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</span><span style="color: rgb(0, 0, 0);">Bluej</span><span style="font-size: medium; font-family: Arial, Helvetica, sans-serif; color: rgb(0, 0, 0);">eans connection: </span><span style="font-size: medium; color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif"><a href="https://bluejeans.com/610445877" target="_blank" style="color: rgb(17, 85, 204)"><span style="color: rgb(12, 100, 192);">https://bluejeans.com/610445877</span><span style="color: rgb(12, 100, 192)"><wbr></span></a></span><span style="font-size: medium; color: rgb(12, 100, 192); font-family: Arial, Helvetica, sans-serif;"> </span></div>
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<span style="color: rgb(0, 0, 0);">Raza, Miguel, Carlota</span></div>
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