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- Stephan Dürr, Giannis Koutsou
- Physical review letters
- 2012

We determine the quark mass ratio m(c)/m(s) on the lattice, using Wilson-type fermions. Configurations with N(f)=2 dynamical clover-improved fermions by the QCDSF Collaboration are used, which were made available through the ILDG. In the valence sector we use a sophisticated, mass-independently O(a)-improved Wilson-type action with small cutoff effects even… (More)

- Marc Wagner, Abdou Abdel-Rehim, +5 authors Carsten Urbach
- 2013

We review the status of an ongoing long-term lattice investigation of the spectrum and structure of tetraquark candidates. We focus on the light scalar meson a0(980). First steps regarding the study of a possibly existing ccc̄c̄ tetraquark are also outlined.

- Constantia Alexandrou, M. Constantinou, +5 authors A. Vaquero
- Computer Physics Communications
- 2014

- Constantia Alexandrou, Tomasz Korzec, +8 authors Carsten Urbach
- 2007

We present results on the mass of the nucleon and the ∆ using two dynamical degenerate twisted mass quarks. The evaluation is performed at four quark masses corresponding to a pion mass in the range of 690-300 MeV on lattices of size 2.1 fm and 2.7 fm. We check for cutoff effects by evaluating these baryon masses on lattices of spatial size 2.1 fm with… (More)

We discuss the techniques to extract the electromagnetic ∆ form factors in Lattice QCD. We evaluate these form factors using dynamical fermions with smallest pion mass of about 350 MeV. We pay particular attention to the extraction of the electric quadrupole form factor that signals a deformation of the ∆. The magnetic moment of the ∆ is extrapolated using… (More)

- Vincent Drach, Mariane Brinet, +10 authors Carsten Urbach
- 2008

We present results on the mass of the baryon octet and decuplet using two flavors of light dynamical twisted mass fermions. The strange quark mass is fixed to its physical value from the kaon sector in a partially quenched set up. Calculations are performed for light quark masses corresponding to a pion mass in the range 270-500 MeV and lattice sizes of 2.1… (More)

Citation Alexandrou, C. et al. " Nucleon to Delta Transition Form Factors with NF=2+1 Domain Wall Fermions. Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. The MIT Faculty has made this article openly available. Please share how this access… (More)

Hadron wave functions and form factors can be extracted using four-point correlators. Stochastic techniques are used to estimate the all to all propagators, which are required for the exact calculation of four-point functions. We apply the so called one-end trick to evaluate meson fourpoint functions. We demonstrate the effectiveness of the technique in the… (More)

- Vincent Drach, Mariane Brinet, +10 authors Carsten Urbach
- 2008

We present results on the mass of the baryon octet and decuplet using two flavors of light dynamical twisted mass fermions. The strange quark mass is fixed to its physical value from the kaon sector in a partially quenched set up. Calculations are performed for light quark masses corresponding to a pion mass in the range 270-500 MeV and lattice sizes of 2.1… (More)

- Zoe Cournia, Hugo Filipe, +6 authors Heini Wernli
- 2014

Samples from binary lead borate glass system doped with minor quantities of copper have been prepared by conventional melt-annealing technique. X-ray diffraction (XRD) has been used to prove the amorphous nature of prepared glasses. Structural and optical properties were investigated using FTIR and UV-vis. Spectroscopic investigations were approved using… (More)