The mission of the
NPLQCD effort is to make predictions for the structure and interactions
of nuclei using lattice QCD.
Our ultimate goal is to calculate the structure and interactions of the
lightest nuclei from QCD. Not only would this allow for the
calculation of nuclear processes in situations where experiments to
guide phenomenological calculations are not possible, but it would also
provide a complete determination of how these processes depend upon the
fundamental constants of nature : the quark masses, the scale of the
strong interaction, and the electroweak interactions.
Understanding how to extract this information from lattice calculations
in Euclidean space is key to accomplishing this goal with lattice QCD.
The Maiani-Testa theorem states that infinite-volume Euclidean space
Green functions cannot be used to extract S-matrix elements except at
kinematic thresholds. Fortunately, by measuring the energy
of two-particle states at finite-volume the two-particle scattering
amplitude can be extracted (at that energy).
We are currently employing this method to study the scattering
lengths of nucleon-nucleon, nucleon-hyperon, hyperon-hyperon,
meson-nucleon, and meson-meson interactions.
|| Physics Results