"A chiral twist to the QCD Schroedinger functional"
Relatore: Dr Stefan Sint- Trinity College - Dublin
30 Settembre 2008 ore 15.30
|QCD can be renormalised at low energies by using
experimental results for the hadron spectrum to fix the
bare coupling and quark masses. With no free parameters
left, any other observable, such as alpha_s(m_Z), becomes
a prediction of the theory.
In principle, lattice QCD is well-suite for such a
strategy, but the presence of large scale differences
poses a problem.
A controlled connection between widely different scales
can be established by using finite volume renormalisation
schemes based on the Schroedinger functional. I will
explain the advantages of this approach as well as its
shortcomings. The latter can be partially overcome by a
modification of the standard set-up, which can be
interpreted as a chiral rotation of the standard