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- Tomasz Korzec, Ulli Wolff
- 2006

We introduce a finite volume renormalization scheme for the N-Majorana-component O(N) invariant Gross-Neveu model. Universal observables are defined that are accessible to precise numerical simulation in various discretizations and allow for an extrapolation to the continuum limit. Here first numerical results with Wilson fermions are reported. For N = 2… (More)

We investigate the two flavor chiral Gross-Neveu model in the Schrödinger functional on the lattice. The procedure necessary to recover chiral symmetry in the continuum limit of this model with Wilson fermions is discussed. We introduce several useful observables and present a first demonstration of the feasibility of Monte-Carlo simulations in this model.… (More)

- 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)

- 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 dynam-ical 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… (More)

- Mattia Dalla Brida, Patrick Fritzsch, Tomasz Korzec, Alberto Ramos, Stefan Sint, Rainer Sommer
- Physical review letters
- 2016

We discuss the determination of the strong coupling α_{MS[over ¯]}(m_{Z}) or, equivalently, the QCD Λ parameter. Its determination requires the use of perturbation theory in α_{s}(μ) in some scheme s and at some energy scale μ. The higher the scale μ, the more accurate perturbation theory becomes, owing to asymptotic freedom. As one step in our computation… (More)

We develop a methodology that enables us to extract accurately the electromagnetic ∆ form factors and their momentum dependence. We test our approach in the quenched approximation as a preparation for a study using dynamical fermions. Our calculation of the four form factors covers pion masses between about 410 MeV and 560 MeV on lattices with a size of 2.9… (More)

- Constantia Alexandrou, Eric B Gregory, +4 authors Antonios Tsapalis
- Physical review letters
- 2011

We present the first calculation on the Δ axial vector and pseudoscalar form factors using lattice QCD. Two Goldberger-Treiman relations are derived and examined. A combined chiral fit is performed to the nucleon axial charge, N to Δ axial transition coupling constant and Δ axial charge.

- 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 dynam-ical 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… (More)

- Björn Leder, DESY Zeuthen, Tomasz Korzec
- 2005

We study the chiral Gross-Neveu model with Wilson fermions. In the framework of the Schrödinger functional we show that in general not only the bare mass has to be tuned to achieve chiral symmetry in the continuum, but also coupling constants multiplying chirally non-invariant four fermion terms. The strategy for fixing the parameters of the theory is… (More)

- Rémi Baron, Pierre Guichon, +12 authors Karl Jansen
- 2008

We present results on the nucleon axial charge and the lowest moment x of the quark distribution using two degenerate flavors of light dynamical twisted mass fermions. The calculation is performed for pion masses in the range of 500 MeV to 300 MeV on a lattice of spatial size of about 2.1 fm.