Axial-Current Matrix Elements in Light Nuclei from Lattice QCD
  I present results from the first lattice QCD calculations of axial-current matrix elements in light nuclei, performed by the NPLQCD collaboration. Precision calculations of these matrix elements, and the subsequent extraction of multi-nucleon axial-current operators, are essential in refining theoretical predictions of the proton-proton fusion cross section, neutrino-nucleus cross sections and $\beta\beta$-decay rates of nuclei. In addition, they are expected to shed light on the phenomenological quenching of $g_A$ that is required in nuclear many-body calculations. 
Martin J. Savage, Phiala E. Shanahan, Brian C. Tiburzi, Michael L.   Wagman, Frank Winter, Silas R. Beane, Emmanuel Chang, Z...
hep-lat hep-ph nucl-th