20181008 11:21 
[PUBDB201803722]
Report/Journal Article
Alexandrou, C. ; Bacchio, S. ; Charalambous, P. ; et al
Simulating twisted mass fermions at physical light, strange, and charm quark masses
[arXiv:1807.00495]
We present the QCD simulation of the first gauge ensemble of two degenerate light quarks, a strange and a charm quark with all quark masses tuned to their physical values within the twisted mass fermion formulation. Results for the pseudoscalar masses and decay constants confirm that the produced ensemble is indeed at the physical parameters of the theory. [...]
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20181008 09:48 
[PUBDB201803714]
Report/Journal Article
Alexandrou, C. ; Cichy, K. ; Constantinou, M. ; et al
LightCone Parton Distribution Functions from Lattice QCD
[arXiv:1803.02685]
We extract parton distribution functions (PDFs) of the nucleon from lattice QCD using an ensemble of gauge field configurations simulated with light quark masses fixed to their physical values. Theoretical and algorithmic improvements that allow such a calculation include momentum smearing to reach large nucleon boosts with reduced statistical errors, nonperturbative renormalization, target mass corrections, and a novel modified matching of lattice QCD results to connect to what is extracted from experimental measurements. [...]
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20180910 10:22 
[PUBDB201803417]
Report/Journal Article
Hasenbusch, M. ; Schaefer, S.
Testing the eventchain algorithm in asymptotically free models
[arXiv:1806.11460]
We apply the eventchain algorithm proposed by Bernard et al. in 2009 to toy models of lattice QCD. [...]
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20180718 10:32 
[PUBDB201802633]
Report/Journal Article
Dalla Brida, M. ; Fritzsch, P. ; Korzec, T. ; et al
A nonperturbative exploration of the high energy regime in $N_{\mathrm{f}}=3$ QCD
[CERNTH2018060, DESY 18044, WUB/1801, arXiv:1803.10230]
Using continuum extrapolated lattice data we trace a family of running couplings in threeflavour QCD over a large range of scales from about 4 to 128 GeV. The scale is set by the finite space time volume so that recursive finite size techniques can be applied, and SchrÃ¶dinger functional (SF) boundary conditions enable direct simulations in the chiral limit. [...]
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20180713 09:12 
[PUBDB201802595]
Preprint/Report
Hasenbusch, M. ; Schaefer, S.
Testing the eventchain algorithm in asymptotically free models
[DESY18090; arXiv:1806.11460]
We apply the eventchain algorithm proposed by Bernard, Krauth and Wilson in 2009 to toy models of lattice QCD. We give a formal prove of stability of the algorithm. [...]
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20180611 10:41 
[PUBDB201802237]
Preprint/Report
Vera, M. G. ; Sommer, R.
Large $N$ scaling and factorization in SU($N$) YangMills gauge theory
[DESY18075; arXiv:1805.11070]
The large $N$ limit of SU($N$) gauge theories is well understood in perturbation theory. Also nonperturbative lattice studies have yielded important positive evidence that t Hoofts predictions are valid. [...]
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20180528 12:31 
[PUBDB201802116]
Preprint/Report
Fritzsch, P. ; Sommer, R. ; Stollenwerk, F. ; et al
Symanzik Improvement with Dynamical Charm: A 3+1 Scheme for Wilson Quarks
[CERNTH2018084; arXiv:1805.01661; DESY18058; HUEP1810]
We discuss the problem of lattice artefacts in QCD simulations enhanced by the introduction of dynamical charmed quarks. In particular, we advocate the use of a massive renormalization scheme with a close to realistic charm mass. [...]
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20180524 11:31 
[PUBDB201802088]
Report/Journal Article
Lin, H.W. ; Nocera, E. R. ; Olness, F. ; et al
Parton distributions and lattice QCD calculations: A community white paper
[DESY17185; IFJPANIV201719; INTPUB17042; MSUHEP17017; NIKHEF2017047; OUTP1715P; SMUHEP1708; arXiv:1711.07916]
In the framework of quantum chromodynamics (QCD), parton distribution functions (PDFs) quantify how the momentum and spin of a hadron are divided among its quark and gluon constituents. Two main approaches exist to determine PDFs. [...]
ddc:530
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20180523 10:59 
[PUBDB201802053]
Report/Journal Article
Banerjee, D. ; Jiang, F.J. ; Olesen, T. Z. ; et al
From the $SU(2)$ quantum link model on the honeycomb lattice to the quantum dimer model on the kagome lattice: Phase transition and fractionalized flux strings
[arXiv:1712.08300]
We consider the (2+1)dimensional SU(2) quantum link model on the honeycomb lattice and show that it is equivalent to a quantum dimer model on the kagome lattice. The model has crystalline confined phases with spontaneously broken translation invariance associated with pinwheel order, which is investigated with either a Metropolis or an efficient cluster algorithm [...]
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20180523 10:56 
[PUBDB201802052]
Report/Journal Article
Alexandrou, C. ; Constantinou, M. ; Hadjiyiannakou, K. ; et al
Strange nucleon electromagnetic form factors from lattice QCD
[arXiv:1801.09581]
We evaluate the strange nucleon electromagnetic form factors using an ensemble of gauge configurations generated with two degenerate maximally twisted mass cloverimproved fermions with mass tuned to approximately reproduce the physical pion mass. In addition, we present results for the disconnected light quark contributions to the nucleon electromagnetic form factors [...]
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