Lattice QCD studies of excited resonances
July 30 - August 31, 2012
Quantum Chromodynamics, when combined with the electroweak interactions, underlies all of nuclear physics, from the spectrum and structure of hadrons to the most complex nuclear reactions. Lattice gauge theory calculations enable the first-principles study of the low-energy properties of QCD, and have, to date, provided predictions of hadron masses and coupling constants, recently reaching the one-percent level of accuracy for some quantities. Only very recently have computer resources and novel methodologies and algorithmic developments allowed preliminary studies of excited- and multi-hadron states using lattice QCD. However, progress has been rapid and within the next few years, benchmark calculations of basic nuclear observables at the physical point are expected, including predictions of the low-lying excited-baryon levels and a compelling observation of the deuteron. In view of these rapid developments, this program will bring together lattice QCD practitioners and other interested physicists to report on progress and discuss the scientific challenges. Below we list a selection of scientic goals that will be addressed in the program.
B. Essential Theoretical Developments
C. Essential Algorithmic Developments
FIG. 1: Masses of the low-lying meson spectrum in units of the nucleon mass classified by irreducible representation of the hypercubic group.
FIG. 2: Extrapolations of the LQCD results for the binding of the H-dibaryon. The left(right) panel shows an extrapolation quadratic(linear) in the pion mass. The green dashed vertical line corresponds to the physical pion mass.