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<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;color:black">Hello All,<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;color:black">Tomorrow, November 8th at 1:00PM (EST), Matthew Rizik will give a seminar on<span class="apple-converted-space"> </span></span><span style="font-size:10.5pt;color:black"><a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__jlab.bluejeans.com_319089525_6769&d=DwMFAw&c=CJqEzB1piLOyyvZjb8YUQw&r=AIMSQQ81YDyrZuJNGks2qw&m=x29E57UMx34WjoS-yLXZS2qNLfa_SlSw0J1QuFd6u80&s=YZDnEovFtz29HvbN26a0A0rgHtJ1M_tEUQ7YAbyNdgA&e=" target="_blank" title="https://urldefense.proofpoint.com/v2/url?u=https-3A__jlab.bluejeans.com_319089525_6769&d=DwMFAw&c=CJqEzB1piLOyyvZjb8YUQw&r=AIMSQQ81YDyrZuJNGks2qw&m=x29E57UMx34WjoS-yLXZS2qNLfa_SlSw0J1QuFd6u80&s=YZDnEovFtz29HvbN26a0A0rgHtJ1M_tEUQ7YAbyNdgA&e="><span style="color:#E49FFF">https://jlab.bluejeans.com/319089525/6769</span></a>.</span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;color:black">Remember to set your clocks back one hour if you haven’t already. Further details given below.<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white"><b><u><span style="font-size:12.0pt;color:black">Theory Seminar</span></u></b><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;color:black">Monday November 8th, 1:00PM<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white"><b><u><span style="font-size:12.0pt;color:black">Matthew Rizik</span></u></b><span class="apple-converted-space"><span style="font-size:12.0pt;color:black"> </span></span><span style="font-size:12.0pt;color:black">(Michigan
State University) will speak about "Operator Mixing with the Gradient Flow"<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white"><b><u><span style="font-size:12.0pt;color:black">Abstract</span></u></b><span style="font-size:12.0pt;color:black">:<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;color:black">The hypothetical presence of a nonzero electric dipole moment of the neutron would imply a violation of charge-parity symmetry (CP) which is absent from the Standard Model.
Toward the characterization of potential BSM sources of CP violation, we study effective interactions in which the high-energy BSM fields are integrated out, leaving a basis of higher-dimensional, local QCD operators. Since these are composite operators, any
attempt at renormalization involves some sort of operator mixing, which, at hadronic scales, must be studied nonperturbatively on a lattice. Naturally, the operator mixing is parametrized solely by the lattice spacing, producing power and logarithmic divergences
as the regulator is removed. We use the gradient flow to reparametrize the operator mixing in terms of the flow time, so that at fixed flow times, each continuum limit may be taken independently, taking the physical $t\rightarrow0^+$ limit only at the end.
Additionally, since operators are multiplicatively renormalized at positive flow time, the identification of the physical renormalized operators becomes a simple matrix inversion, in which the divergent operator mixing may be calculated in perturbation theory
and subtracted off to arbitrary order. We study the leading-order renormalization of the quark chromoelectric dipole moment (qCEDM), presenting both nonperturbative and next-to-leading-order perturbative results on the power-divergent mixing with the pseudoscalar
density with some perturbative results on the leading logarithms.<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;color:black">See you tomorrow!<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;color:black">Astrid, Colin & Patrick<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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