[Jlab-seminars] Theory Center Seminar

[Mary Fox]

Theory Center Seminar
Monday, Dec. 14, 2015
1:00 p.m. (coffee at 12:45 p.m.)
CEBAF Center, Room L102

Derek Horkel
University of Washington

*Phase Structure of Lattice QCD with Wilson and Twisted-Mass Fermions 
Including Isospin Breaking*

As the precision frontier of particle physics continues to develop, the 
field of lattice QCD has risen to the challenge.
Modern lattice simulations, have increasingly included light 
non-degenerate up and down quark masses and
electromagnetism. Previously answered questions about the vacuum 
structure of QCD on the lattice must be
reexamined when these isospin breaking effects are included. If not 
careful, lattice practitioners may simulate
in non-physical phases which cannot be extrapolated to the continuum 
limit. Using chiral perturbation theory,
I will discuss where these non-physical phases can arise for Wilson and 
twisted mass fermions. I will also explain
some of the complications which arise when tuning the up and down 
twisted quark masses to their critical values
in the presence of electromagnetism.
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