[Theory-seminars] Cake Seminar tomorrow

[Pia Jones Petrak]

Hey everyone,

We will be having an *in-person*  Cake Seminar *tomorrow at 1pm**in 
F224-225*. Below is the info**

Speaker:  Pia Jones Petrak (JLab)

Title: Baryon Octet Sigma Terms from Lattice QCD

Abstract:
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.

Best wishes,

Adam, Joe, and Pia
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