Probing TeV physics with precision calculations of nucleon matrix elements using lattice QCD

Tuesday, 22 October 2019 at 11:15, in Y16 G05 - Campus Irchel

This talk will present a suite of high precision results on matrix  elements of quark bilinear operators between nucleon states using lattice QCD. From these, we extract a number of exciting quantities, at the intersection of nuclear and particle physics. We show that the  axial charge g_A, a fundamental parameter encapsulating the weak  interaction of nucleons, is calculated with a few percent  accuracy. Results for the scalar and tensor charges, g_S and g_T, which combined with precision neutron decay distribution probe novel  scalar and tensor interactions at the TeV scale. Vector form factors  are probed in electron scattering, while axial vector form factors are  used in the calculation of the cross-section of neutrinos on nuclear  targets. These energy dependent cross-sections are needed to determine  the neutrino flux, an important systematic in neutrino oscillation experiments.  Finally we will present results for flavor diagonal  charges that provide the contribution of the quark spin to the nucleon spin, the quark EDM to the neutron EDM. These matrix elements also impact the cross-section of dark matter with nuclear targets.