[Theory-seminars] W&M/JLab interviews. Wednesday. L102 2pm. Chris Monahan

[Alessandro Pilloni]

W&M/JLab faculty interviews

Wednesday, Jan 27, 2016
2:00 p.m. 
CEBAF Center, Room L102

Chris Monahan
Rutgers U.

Title: Towards a first principles picture of the proton

Abstract: 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 programme for the direct determination of nucleon 
structure on the lattice.

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W&M/JLab interviews calendar:

Jan. 20: Jo Dudek at JLab
Jan. 21: Dudek at W&M

Jan. 27: Chris Monahan at JLab
Jan. 28: Monahan at W&M

Feb. 4: Phiala Shanahan at W&M
Feb. 5: Shanahan at JLab

Feb. 10: Maxwell Hansen at JLab
Feb. 11: Hansen at W&M

Feb. 17: Martha Constantinou at JLab
Feb. 18: Constantinou at W&M

Mar. 2: Gernot Eichmann at JLab
Mar. 3: Eichmann at W&M