Robert Mawhinney
(Columbia University)
15/06/2010, 14:30
Hadron spectroscopy
We are producing 2+1 flavor DWF ensembles with dynamical
pion masses of 180 and 250 MeV, a volume of (4.5 fm)^3 and 1/a =
1.4 GeV, using the Iwasaki plus DSDR (Dislocation Suppressing
Determinant Ratio) gauge action. Basic properties of these ensembles
and their production are discussed. We report on measurements of
pseudoscalar masses and decay constants on these ensembles,...
Chulwoo Jung
(Brookhaven National Laboratory)
15/06/2010, 14:50
Hadron spectroscopy
The slope of nucleon mass with respect to the dynamical strange quark mass
is directly related to the strange quark content of nucleon
($\langle N | \bar{s}s | N \rangle $).
This slope can be calcuated by shifting of dynamical strange quark mass
via reweighting on dynamical ensembles, which
allows a relatively inexpensive evaluation of the quantity without direct
evaluation of...
Alberto Ramos
(Centre de Physique Theorique, Marseille (CNRS))
15/06/2010, 15:10
Hadron spectroscopy
The sigma term and strange content of the nucleon play an important role in hadronic physics and dark matter detection. Preliminary results for these quantities, obtained from 2+1 flavor lattice QCD simulations, will be presented. Emphasis will be put on controlling and quantifying systematic errors. This work is performed as part of a Budapest-Marseille-Wuppertal + Regensburg collaboration.
Paul Rakow
(University of Liverpool)
15/06/2010, 15:30
Hadron spectroscopy
The QCD interaction is flavour-blind. Neglecting electromagnetic and weak interactions, the only difference between flavours comes from the mass matrix. We investigate how flavour-blindness constrains hadron masses after flavour SU(3) is broken by the mass difference between the strange and light quarks, to help us extrapolate 2+1 flavour lattice data to the physical point.
We have...
Roger Horsley
(University of Edinburgh)
15/06/2010, 15:50
Hadron spectroscopy
QCD lattice simulations with 2+1 flavours typically start at
rather large up-down and strange quark masses and extrapolate
first the strange quark mass to its physical value and then
the up-down quark mass. An alternative method of tuning the
quark masses is discussed here in which the singlet quark mass
is kept fixed, which ensures that the kaon always has mass less
...
