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<p>Hey everyone,</p>
<p>We will be having an <b>in-person</b> Cake Seminar <b>tomorrow
at 1pm</b><b> in F224-225</b>. Below is the info<b></b><br>
<br>
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>Best wishes,<br>
</p>
<p>Adam, Joe, and Pia</p>
<p></p>
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