[Jlab-seminars] Theory Center Seminar

[Mary Fox]

Theory Center Seminar
Monday, Sept 28, 2015
CEBAF Center, Room L102
1:00-2:00 p.m.

Alessandro Baroni
Old Dominion University

*Nuclear Axial Currents in Chiral Effective Field Theory *

Two-nucleon axial charge and current operators are derived in chiral 
effective field theory up to one loop.
The derivation is based on time-ordered perturbation theory and accounts 
for cancellations between the
contributions of irreducible diagrams and the contributions due to 
non-static corrections from energy
denominators of reducible diagrams. Ultraviolet divergencies associated 
with the loop corrections are
isolated in dimensional regularization. The resulting axial current is 
finite and conserved in the chiral limit,
while the axial charge requires renormalization. A complete set of 
contact terms for the axial charge up to
the relevant order in the power counting is constructed.

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