The Excited-state Spectrum of QCD through Lattice Gauge Theory Calculations

Abstract

I describe the computation of the spectrum of Quantum Chromodynamics through first principles calculations using lattice gauge theory. I begin outlining briefly the formulation of QCD on a lattice, and then describe some of the challenges in computing the exciting state spectrum of the theory. I then present recent results for the spectrum for mesons containing both the light and heavier charm quarks, and for baryons containing the light quarks. A particular emphasis will be laid on the role played by gluons within the spectrum. I conclude by some of the challenges that remain, notably those due to strong decays, and the prospect for future calculations.