θ dependence of SU (N) gauge theories in the presence of a topological term

E Vicari, H Panagopoulos - Physics Reports, 2009 - Elsevier
We review results concerning the θ dependence of 4D SU (N) gauge theories and QCD,
where θ is the coefficient of the CP-violating topological term in the Lagrangian. In particular …

Critical slowing down and error analysis in lattice QCD simulations

S Schaefer, R Sommer, F Virotta, Alpha Collaboration - Nuclear Physics B, 2011 - Elsevier
We study the critical slowing down towards the continuum limit of lattice QCD simulations
with Hybrid Monte Carlo type algorithms. In particular for the squared topological charge we …

Observation of string breaking in QCD

GS Bali, H Neff, T Duessel, T Lippert, K Schilling… - Physical Review D …, 2005 - APS
We numerically investigate the transition of the static quark-antiquark string into a static-light
meson-antimeson system. Improving noise reduction techniques, we are able to resolve the …

QCD at fixed topology

R Brower, S Chandrasekharan, JW Negele, UJ Wiese - Physics Letters B, 2003 - Elsevier
Since present Monte Carlo algorithms for lattice QCD may become trapped in a fixed
topological charge sector, it is important to understand the effect of calculating at fixed …

Low fermionic eigenmode dominance in QCD on the lattice

H Neff, N Eicker, T Lippert, JW Negele, K Schilling - Physical Review D, 2001 - APS
We demonstrate the utility of a spectral approximation to fermion loop operators using low-
lying eigenmodes of the Hermitian Dirac-Wilson matrix, Q= γ 5 M. The investigation is based …

Topological susceptibility and the sampling of field space in N f= 2 lattice QCD simulations

M Bruno, S Schaefer, R Sommer - Journal of High Energy Physics, 2014 - Springer
A bstract We present a measurement of the topological susceptibility in two flavor QCD. In
this observable, large autocorrelations are present and also sizable cutoff effects have to be …

The UA (1) problem on the lattice with Ginsparg–Wilson fermions

L Giusti, GC Rossi, M Testa, G Veneziano - Nuclear Physics B, 2002 - Elsevier
We show how it is possible to give a precise and unambiguous implementation of the Witten–
Veneziano formula for the η′ mass on the lattice, which looks like the formal continuum …

Testing the fixed-point QCD action and the construction of chiral currents

P Hasenfratz, S Hauswirth, T Jörg, F Niedermayer… - Nuclear Physics B, 2002 - Elsevier
We present the first set of quenched QCD measurements using the recently parametrized
fixed-point Dirac operator DFP. We also give a general and practical construction of …

Effects of nonperturbatively improved dynamical fermions in QCD at fixed lattice spacing

CR Allton, SP Booth, KC Bowler, J Garden, A Hart… - Physical Review D, 2002 - APS
We present results for the static interquark potential, lightest glueballs, light hadron
spectrum, and topological susceptibility using a nonperturbatively improved action on a 16 …

Precision study of the SU (3) topological susceptibility in the continuum

S Dürr, Z Fodor, C Hoelbling… - Journal of High Energy …, 2007 - iopscience.iop.org
We determine the topological susceptibility in the SU (3) pure gauge theory. We perform a
series of high-statistics lattice studies and take the combined continuum and infinite volume …