<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class=""><div class="">Theory Center Seminar</div><div class="">Monday, Sept 28, 2015</div><div class="">CEBAF Center, Room L102</div><div class="">1:00-2:00 p.m. </div><div class=""><br class=""></div><div class="">Alessandro Baroni (ODU)</div></div><div class=""><br class=""></div><div class="">
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<div class="column"><p class=""><span style="font-size: 9.000000pt; font-family: 'CMBX9'" class="">Title: Nuclear Axial Currents in Chiral Effective Field Theory
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<div class="column"><p class=""><span style="font-size: 10.000000pt; font-family: 'CMR10'" class="">Abstract: 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. </span></p>
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