Lattice2010

Session

Parallel 22: Hadron spectroscopy

15 Jun 2010, 10:30

Villasimius, Sardinia

193. Low lying baryon spectrum with Nf=2+1+1 dynamical twisted quarks.

Vincent Drach (LPSC)

15/06/2010, 10:30

Hadron spectroscopy

We present first results on the octet and decuplet strange baryon spectrum with N_f=2+1+1 twisted mass quarks using a mixed action approach. Namely, we use an Osterwalder Seiler valence strange quark with a mass matched to the kaon mass computed with the unitary action. We also present results in the unitary setup, and compare with those obtained in the mixed action. This comparison...

106. Excited states of the nucleon in 2+1 flavour QCD

Derek Leinweber (University of Adelaide)

15/06/2010, 10:50

Hadron spectroscopy

Recent developments on the determination of the spin-1/2 spectrum of the nucleon in full QCD are presented. Our focus is on the PACS-CS 2+1 flavour configurations made available through the ILDG. Using correlation matrix techniques, in which a wide variety of gauge-invariant Gaussian-smeared fermion-propagator sources and sinks are considered, excited states are determined. We consider...

207. Nucleon, Delta and Omega excited state spectra at three pion mass values

Stephen Wallace (Univ. of Maryland)

15/06/2010, 11:10

Hadron spectroscopy

The energies of excited states of the Nucleon, Delta and Omega baryons are calculated for Nf = 2+1 QCD using a 16^3x128 lattice. The calculations are performed for three values of the light quark mass with the strange quark mass fixed at its physical value. The corresponding values of pion mass are: 392(4), 438(3) and 521(3) MeV. For each baryon, six states are obtained in each of the 6...

269. From strange to charmed baryons using Nf=2 twisted mass QCD.

Mauro Papinutto (LPSC Grenoble)

15/06/2010, 11:30

Hadron spectroscopy

We consider the mass spectrum for strange and charmed baryons in the partially quenched approach using the Nf=2 twisted mass configurations. The strange and the charmed octet and decuplet are computed, as well as some strange-charmed baryons. Several issues are investigated : the tuning of the strange and charm quark mass; the study of lattice artifacts using three values of the lattice...

323. Construction and Analysis of Two Baryon Correlation functions

Kostas Orginos (College of William and Mary / JLab)

15/06/2010, 11:50

Hadron spectroscopy

The signal to noise ratio of baryon two point functions grows exponentially with Euclidean time hindering reliable extraction of the energy levels of the system. The problem becomes more acute in the case of two or more baryon correlation functions. For this reason special care is needed in both constructing, and analyzing two point functions of multi-baryon systems. In this talk I will...

200. Meson spectra from overlap fermion on domain wall gauge configurations

Nilmani Mathur (Tata Institute of Fundamental Research, India)

15/06/2010, 12:10

Hadron spectroscopy

We report meson spectra obtained by using valence overlap fermion propagators generated on a background of 2+1 flavor domain wall fermion gauge configurations on the $16^3 \times 32$, $24^3 \times 64$ and $32^3 \times 64$ lattices. We use many-to-all correlators with $Z_3$ grid source and low eigenmode substitution which is more efficient in reducing errors for the hadron correlators. Three...