M. Gürtler

Three-dimensional lattice studies of the electroweak phase transition at MHiggs · 70 GeV

We study the electroweak phase transition by lattice simulations of an effective 3-dimensional theory, for a Higgs mass of about 70 GeV. Exploiting, among others, a variant of the equal weight criterion of phase equilibrium, we obtain transition temperature, latent heat and surface tension, and compare with MH · 35 GeV. In the broken phase masses and Higgs condensates are compared to perturbation theory. For the symmetric phase, bound state masses and the static force are determined.

Quark spectra and light hadron phenomenology from overlap fermions with improved gauge field action

We present first results from a simulation of quenched overlap fermions with improved gauge field action. Among the quantities we study are the spectral properties of the overlap operator, the chiral condensate and topological charge, quark and hadron masses, and selected nucleon matrix elements. To make contact with continuum physics, we compute the renormalization constants of quark bilinear operators in perturbation theory and beyond.

A lattice determination of gA and 〈x〉 from overlap fermions☆

We present results for the nucleon axial charge gA and for the first moment 〈 x 〉 of the unpolarized nucleon structure function from a simulation of quenched overlap fermions.

Structure functions and form factors close to the chiral limit from lattice QCD

Abstract Results for nucleon matrix elements (arising from moments of structure functions) and form factors from a mixture of runs using Wilson, clover and overlap fermions (both quenched and unquenched) are presented and compared in an effort to explore the size of the chiral ‘regime’, lattice spacing errors and quenching artefacts. While no run covers this whole range of effects the partial results indicate a picture of small lattice spacing errors, small quenching effects and only reaching the chiral regime at rather light quark masses.

Nucleon Structure from Quenched Overlap Fermions

Theoretical Physics Division, Department of Mathematical Sciences, University of LiverpoolLiverpool L69 3BX, UKE-mail:galletly@ph.ed.ac.uk, martin.guertler@desy.de,rhorsley@ph.ed.ac.uk, karl.koller@lrz.uni-muenchen.de,volkard.linke@physik.fu-berlin.de,rakow@amtp.liv.ac.uk,cjr@amtp.liv.ac.uk, gerrit.schierholz@desy.de,thomas.streuer@desy.deQCDSF CollaborationWe compute the lowest moments of the nucleon’s structure functions using quenched overlapfermions at two different lattice spacings. The renormalisation is done nonperturbatively in theRI

3-Dimensional approach to hot electroweak matter for MHiggs ≤ 70 GeV

We study the electroweak phase transition by lattice simulations of an effective 3-dimensional theory, for a Higgs mass of about 70 GeV. Exploiting a variant of the equal weight criterion of phase equilibrium, we obtain transition temperature, latent heat and surface tension and compare with M H ≈ 35 GeV. For the symmetric phase, bound state masses and the static force are determined and compared with results for pure SU (2) theory.

Detailed phase transition study at MH ≤ 70 GeV in a 3-dimensional SU(2)-Higgs model

Abstract We study the electroweak phase transition in an effective 3-dimensional theory for a Higgs mass of about 70 GeV by Monte Carlo simulations. The transition temperature and jumps of order parameters are obtained and extrapolated to the continuum using multi-histogram techniques and finite size analysis.

Physics of the electroweak phase transition at MH ≤ 70 GeV in a 3-dimensional SU(2)-higgs model

Abstract Physical parameters of the electroweak phase transition in a 3d effective lattice SU(2)-Higgs model are presented. The phase transition temperatures, latent heats and continuum condensate discontinuities are measured at Higgs masses of about 70 and 35 GeV. Masses and Higgs condensates are compared to perturbation theory in the broken phase. In the symmetric phase bound states and the static force are determined.