M.
Cédric Mezrag
(IRFU/SPhN)
15/01/2015 11:05
If at high energy QCD can be described using perturbation theory due to asymptotic freedom, when going at low energy the fundamental degrees of freedom of the theory, quarks are gluons, are bounded inside hadrons. The hadron structure in terms of partons has been studied since the 1960s. Today several objects have been both theoretically and experimentally studied, like for instance...
M.
Xiu-Lei REN
(IPN Orsay)
15/01/2015 11:19
We study the ground-state octet baryon masses and sigma terms using the covariant baryon chiral perturbation theory (ChPT) with the extended-on-mass-shell (EOMS) renormalization scheme up to next-to-next-to-next-to-leading order (N$^3$LO). In order to systematically study the lattice QCD data and to fix the low-energy constants (LECs), the finite-volume corrections (FVCs) and finite lattice...
Laurent Lellouch
(CPT Marseille)
15/01/2015 11:33
The difference between the masses of the neutron and the proton is only 0.14% of their average. Yet this difference has important implications for the existence and stability of ordinary matter. After explaining how electromagnetic and mass isospin breaking effects can be included in lattice QCD computations, I will show how this mass difference arises from a subtle cancellation of these two...
Antoine Gérardin
(Laboratoire de Physique Corpusculaire (LPC))
15/01/2015 11:47
Computing the quark propagator on the lattice gets more and more difficult as the light quark becomes small and approach its physical value. Therefore, most simulations are performed at unphysical light quark masses and the results are extrapolated to the physical mass using fit formulae inspired by chiral perturbation theory. In the case of heavy-light mesons, one can use the Heavy Meson...
Savvas Zafeiropoulos
(Goethe Universitaet Frankfurt)
15/01/2015 12:01
We summarize recent analytical results obtained for the discretization effects of the non-Hermitian Wilson Dirac operator. We include the effect of all three leading low energy constants in our analysis. In particular we discuss the results for the eigenvalue densities close to the continuum limit but we also consider the case of large lattice spacing which is closely related to the mean field...
Elena Petreska
(CPHT - Ecole Polytechnique)
15/01/2015 12:29
The field configuration in the first moments of high-energy heavy-ion collisions is represented by strong longitudinal chromo-electric and chromo-magnetic fields. The form of these fields is obtained by solving the classical Yang-Mills equations of motion for two color charge sheets passing through each other with appropriate boundary conditions on the light cone. We calculate perturbatively...
