Thursday, March 12, 2009, 16:00
WHGA Auditorium
S. Dürr, FZ Jülich
Abstract:
Do we understand strong interactions quantitatively ? If so, we should
be able to derive key properties of hadrons, such as their mass, "ab
initio" from the interaction of quarks and gluons. In particular the
phenomenon of generating "mass from no mass" (i.e. of having a massive
proton even with exactly massless quarks and gluons) is a distinctive
property of QCD. In this colloquium I will describe recent efforts, made
in the context of the Budapest-Marseille-Wuppertal ("BMW")
collaboration, to compute the masses of the flavor non-singlet mesons
and of the light baryon octet and decuplet in the isospin limit of QCD
on the lattice, with fully controlled systematics. I will also sketch
how the lattice can contribute, in a further perspective, to the
particle physics adventure by separating QCD effects from potential "new
physics" effects.