ZEU-NIC

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2018-10-08
11:21
OpenAccess [PUBDB-2018-03722] Report/Journal Article
; ; ; 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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2018-10-08
09:48
OpenAccess [PUBDB-2018-03714] Report/Journal Article
; ; ; et al
Light-Cone 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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2018-09-10
10:22
OpenAccess [PUBDB-2018-03417] Report/Journal Article
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Testing the event-chain algorithm in asymptotically free models
[arXiv:1806.11460]
We apply the event-chain algorithm proposed by Bernard et al. in 2009 to toy models of lattice QCD. [...]
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2018-07-18
10:32
OpenAccess [PUBDB-2018-02633] Report/Journal Article
; ; ; et al
A non-perturbative exploration of the high energy regime in $N_{\mathrm{f}}=3$ QCD
[CERN-TH-2018-060, DESY 18-044, WUB/18-01, arXiv:1803.10230]
Using continuum extrapolated lattice data we trace a family of running couplings in three-flavour 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 Schrödinger functional (SF) boundary conditions enable direct simulations in the chiral limit. [...]
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2018-07-13
09:12
arXiv [PUBDB-2018-02595] Preprint/Report
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Testing the event-chain algorithm in asymptotically free models
[DESY-18-090; arXiv:1806.11460]
We apply the event-chain 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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2018-06-11
10:41
OpenAccess [PUBDB-2018-02237] Preprint/Report
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Large $N$ scaling and factorization in SU($N$) Yang-Mills gauge theory
[DESY-18-075; arXiv:1805.11070]
 GO
The large $N$ limit of SU($N$) gauge theories is well understood in perturbation theory. Also non-perturbative lattice studies have yielded important positive evidence that t Hoofts predictions are valid. [...]
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2018-05-28
12:31
arXiv [PUBDB-2018-02116] Preprint/Report
; ; ; et al
Symanzik Improvement with Dynamical Charm: A 3+1 Scheme for Wilson Quarks
[CERN-TH-2018-084; arXiv:1805.01661; DESY-18-058; HU-EP-18-10]
 GO
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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2018-05-24
11:31
Embargoed OpenAccess [PUBDB-2018-02088] Report/Journal Article
; ; ; et al
Parton distributions and lattice QCD calculations: A community white paper
[DESY-17-185; IFJPAN-IV-2017-19; INT-PUB-17-042; MSUHEP-17-017; NIKHEF-2017-047; OUTP-17-15P; SMU-HEP-17-08; 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. [...]
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2018-05-23
10:59
OpenAccess [PUBDB-2018-02053] Report/Journal Article
; ; ; 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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2018-05-23
10:56
OpenAccess [PUBDB-2018-02052] Report/Journal Article
; ; ; 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 clover-improved 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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