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<div class="">Theory Center Seminar<br class="">
Wednesday, Dec 9, 2015<br class="">
2:30 p.m. (coffee at 2:15 p.m.)<br class="">
CEBAF Center, Room <b class="">F324/325 </b></div>
<br class="">
Chris Monahan <br class="">
Rutgers University<br class="">
<br class="">
<b>Going with the (Gradient) Low: Nucleon Structure and
Power-Divergent Mixing on the Lattice</b><br class="">
<br class="">
The direct determination of Parton distribution functions (PDFs)
from lattice QCD is an unsolved problem. <br>
The traditional approach expresses moments of PDFs in terms of
matrix elements of local operators, but<br>
these operators suffer from power-divergent mixing that stems from
the hypercubic symmetry of the lattice<br>
regulator. I will introduce the gradient flow as a means to suppress
this power-divergent mixing, at the expense<br>
of introducing a new physical scale in the continuum. I will
highlight two approaches to dealing with this new <br>
scale that could ultimately lead to ab initio calculations of PDFs
on the lattice.
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