<!DOCTYPE html><html><head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<p>Hey everyone,</p>
<p>We will be having an <b>in-person</b> Cake Seminar<b> today at
1pm</b><b>. </b>Please join us<b> in F224-225</b> (or on Zoom).
Below is the info</p>
<p>Speaker: Pia Jones Petrak (JLab)<br>
<br>
Title: Baryon Octet Sigma Terms from Lattice QCD<br>
<br>
Abstract:<br>
Sigma terms are of fundamental interest as they are the quark mass
contributions to the mass of a given baryon. As the key input for
neutrino and nucleon cross-sections, the nucleon sigma terms are
relevant for comparing model predictions to direct dark matter
experiments (e.g. the XENON experiment). Further, for the
nucleon-pion sigma a long standing discrepancy between Lattice QCD
and phenomenology persists. By performing a direct determination
of the full baryon octet for the first time in a combined
analysis, we provide new insight into this disparity. In this
talk, I will present how we tackle the excited state
contamination, one of the biggest challenges in such calculations;
we investigate the effect of different multi-state fits on the
sigma terms and assess systematics. The baryon octet sigma terms
are then simultaneously extrapolated to the physical point taking
the quark mass dependence, lattice spacing and finite volume
effects into account. I will conclude by discussing the final
steps to work out the error budget in detail, including systematic
errors and correlations.</p>
<p>Zoom: <a class="moz-txt-link-freetext" href="https://jlab-org.zoomgov.com/j/1618830457?pwd=eivPbV03vSuapOPsasOuDMrv0HhJic.1">https://jlab-org.zoomgov.com/j/1618830457?pwd=eivPbV03vSuapOPsasOuDMrv0HhJic.1</a></p>
<p>Best wishes,<br>
</p>
<p>Adam, Joe, and Pia</p>
<p><br>
</p>
<pre class="moz-signature" cols="72">--
Pia Leonie Jones Petrak
Postdoctoral Fellow
Theoretical and Computational Physics Center
Jefferson Lab</pre>
</body>
</html>