33 citations · 156 across the 15 of their papers we have counts for
17 papers
Static-light meson spectroscopy with optimal distillation profiles
Laura Struckmeier, Roman Höllwieser, Francesco Knechtli +3
The spectrum of static-light and static-charm mesons is studied using optimized distillation in two different QCD ensembles with pion masses of $m_π \approx 80…
The strength of the interaction between quarks and gluons
Mattia Dalla Brida, Roman Höllwieser, Francesco Knechtli +4
Modern particle physics experiments, e.g. at the Large Hadron Collider (LHC) at CERN, crucially depend on the precise description of the scattering processes in terms of the known…
The determination of and in QCD
Tom Matty Bo Asmussen, Roman Höllwieser, Francesco Knechtli +1
We determine the scales , , the ratio for = 2 + 1 flavor QCD ensembles generated by CLS. These scales are determined from an improved definition of the st…
Results for from the decoupling strategy
Mattia Dalla Brida, Roman Höllwieser, Francesco Knechtli +5
We present analysis details and new results for the strong coupling , determined by the decoupling strategy. We measure a massive gradient flow (GF) coupling defined in f…
On the correlation coefficient T(E_e) of the neutron beta decay, caused by the correlation structure invariant under discrete P, C and T symmetries
A. N. Ivanov, R. Höllwieser, N. I. Troitskaya +2
We analyze the correlation coefficient T(E_e), which was introduced by Ebel and Feldman (Nucl. Phys. 4, 213 (1957)). The correlation coefficient T(E_e) is induced by the correlatio…
Non-perturbative renormalization by decoupling
Mattia Dalla Brida, Roman Höllwieser, Francesco Knechtli +3
We propose a new strategy for the determination of the QCD coupling. It relies on a coupling computed in QCD with degenerate heavy quarks at a low energy scale $…
Chiral Symmetry Breaking on the Lattice
Manfried Faber, Roman Höllwieser
We review important aspects of QCD in the continuum and on the lattice and take a look at the fate of its symmetries with an emphasis on chiral symmetry breaking on the lattice.
Comment on "Fractional topological charges and the lowest Dirac modes"
Derar Altarawneh, Roman Höllwieser
We comment on a recent article published in Phys. Rev. D98 (2018) no.9, 094513, arXiv:1811.09029, pointing out severe problems in the numerical investigation leading to questionabl…
Constraint HMC algorithms for gauge-Higgs models
Roman Höllwieser, Francesco Knechtli
We present the construction of constraint HMC algorithms for gauge-Higgs models in order to measure the effective Higgs potential. In particular we focus on SU(2) Gauge-Higgs Unifi…
Neutron Dark Matter Decays and Correlation Coefficients of Neutron Beta Decays
A. N. Ivanov, R. Höllwieser, N. I. Troitskaya +2
As we have pointed out in (arXiv:1806.10107 [hep-ph]), the existence of neutron dark matter decay modes "n -> chi + anything", where "chi" is a dark matter fermion, for the solutio…
Tests of the Standard Model in Neutron Beta Decay with Polarized Neutron and Electron and Unpolarized Proton
A. N. Ivanov, R. Höllwieser, N. I. Troitskaya +2
We analyse the electron--energy and angular distribution of the neutron beta decay with polarized neutron and electron and unpolarized proton, calculated in Phys. Rev. C 95, 055502…
Center Vortices and Topological Charge
Roman Höllwieser
I review important aspects of the relation between center vortices and topological charge, leading to chiral symmetry breaking.
Precision Theoretical Analysis of Neutron Radiative Beta Decay to Order "O(α^2/π^2)"
A. N. Ivanov, R. Höllwieser, N. I. Troitskaya +2
In the Standard Model (SM) we calculate the decay rate of the neutron radiative beta decay to order "O(α^2/π^2 ~ 10^{-5})", where "α$"is the fine--structure constant, and radiative…
Two Photon Exchange in Impact Parameter Space in the Relativistic Eikonal Approximation for Elastic e - N Scattering
Tareq Alhalholy, Roman Höllwieser
Using the relativistic Eikonal approximation, we study the one and two photon exchange amplitudes in elastic electron-nucleon scattering for the case of transversely polarized nucl…
Center Vortices, Area Law and the Catenary Solution
Roman Höllwieser, Derar Altarawneh
We present meson-meson (Wilson loop) correlators in Z(2) center vortex models for the infrared sector of Yang-Mills theory, i.e., a hypercubic lattice model of random vortex surfac…
Center Vortex vs. Abelian models of the QCD vacuum
Roman Höllwieser, Jeff Greensite
We present evidence that the center vortex model of confinement is more consistent with lattice results than other currently available models. In particular we show that Abelian fi…
Intersections of thick Center Vortices, Dirac Eigenmodes and Fractional Topological Charge in SU(2) Lattice Gauge Theory
Roman Höllwieser, Manfried Faber, Urs M. Heller
Intersections of thick, plane SU(2) center vortices are characterized by the topological charge |Q|=1/2. We compare such intersections with the distribution of zeromodes of the Dir…