T-16 seminar: Gautam Rupak Tues, 09/14, 10:30a, T Div Conf Room (TA-3, SM-123, Rm 121)

Speaker: Gautam Rupak (T-16, LANL)

Nuclear Physics from lattice QCD: Finite lattice spacing and volume effects

Numerical simulation of QCD via lattice QCD is the only method currently available for calculating low-energy hadronic observables directly from the fundamental theory of QCD. However, these simulations are still a long way from calculating hadronic matrix elements with physically relevant light up and down quark masses. Chiral perturbation theory (ChPT) could provide a controlled, systematic extrapolation of the lattice data to the physical region. In this talk I will describe extensions of chiral perturbation theory relevant for lattice QCD that include dependence on the lattice spacing 'a' to quadratic order. Besides, large quark masses and lattice spacing, finite volume effects need to be small to extract physical observables from lattice QCD. I will describe how one can use ChPT (with a modified power counting) to extract nucleon mass from lattice simulation done even on a small volume.