Mission Statement

The mission of the
NPLQCD effort is to make predictions for the structure and interactions
of nuclei using lattice QCD.

Physics Issues

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.

Computational Resources || Physics Results || Meetings

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.

Computational Resources || Physics Results || Meetings