[Jlab-seminars] Theory Center Seminar

[Mary Fox]

Theory Center Seminar
Wednesday, Jan 27, 2016
2:00 p.m.  (coffee at 1:45 p.m.)
CEBAF Center, Room L102

Chris Monahan
Rutgers University

*Towards a First Principles Picture of the Proton *

The direct calculation of nucleon structure from first principles is an 
unsolved challenge
for quantum chromodynamics (QCD). In particular, parton distribution 
functions (PDFs),
which capture the longitudinal momentum structure of fast-moving 
nucleons, are defined
on the light cone and are not directly accessible in Euclidean lattice 
QCD. To circumvent this
problem, moments of PDFs can be expressed in terms of matrix elements of 
local operators,
but these operators suffer from power-divergent mixing, which stems from 
the hypercubic
symmetry of the lattice regulator. I will introduce a new method that 
suppresses this power
divergent mixing, at the expense of introducing a new physical scale in 
the continuum. I will
highlight the role that this method plays in ab initio calculations of 
PDFs and outline a program
for the direct determination of nucleon structure on the lattice.
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