Theoretical Physics Colloquium
Towards precision results in lattice Quantum Chromo Dynamics
by Prof. Stefan Sint (Trinity College, Dublin, and NIC@DESY-Zeuthen, Germany)
Tuesday, December 10, 2013
from
to
(Asia/Kolkata)
at Colaba Campus ( AG69 )
at Colaba Campus ( AG69 )
Description |
Quantum Chromo Dynamics (QCD) is the underlying theory of the strong nuclear interactions and thus constitutes a central pillar of the Standard Model of particle physics. One of the characteristic features of QCD is the confinement of quarks inside hadronic bound states such as the proton or the pion. Lattice QCD has been designed to calculate properties of hadrons by means of numerical simulations. On the other hand, at distances much smaller than the size of the hadrons, the quarks behave almost like free particles, a property known as asymptotic freedom. Interactions between quarks at such short distance scales can be calculated by perturbing around a hypothetical situation of free quarks. Since QCD is a single theory describing both regimes, the challenge is to provide a controlled connection between properties of quarks and those of hadrons. For lattice QCD as a numerical approach, the main difficulty consists in accommodating very different length scales while keeping the lattice sizes affordable. I will explain how this problem can be overcome by using the finite space-time volume to probe the theory, and I will present a few results that have been obtained by the Alpha collaboration over the last few years. |