ZEU-NIC

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2018-11-19
16:53
DBCoverage [PUBDB-2018-04636] Report/Journal Article
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New extended interpolating fields built from three-dimensional fermions
[DESY-18-091; arXiv:1807.08714]
New extended interpolating operators made of quenched three dimensional fermions are introduced in the context of lattice QCD. The mass of the 3D fermions can be tuned in a controlled way to find a better overlap of the extended operators with the states of interest. [...]
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2018-11-05
14:06
OpenAccess [PUBDB-2018-04147] Report/Journal Article
; ; ; et al
Hadronic light-by-light scattering amplitudes from lattice QCD versus dispersive sum rules
[MITP-17-088; DESY-17-202; arXiv:1712.00421]
The hadronic contribution to the eight forward amplitudes of light-by-light scattering ($\gamma^*\gamma^*\to \gamma^*\gamma^*$) is computed in lattice QCD. Via dispersive sum rules, the amplitudes are compared to a model of the $\gamma^*\gamma^*\to {\rm hadrons}$ cross sections in which the fusion process is described by hadronic resonances. [...]
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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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2018-10-01
11:39
OpenAccess [PUBDB-2018-03680] Report/Journal Article
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QCD thermodynamics from lattice calculations with nonequilibrium methods: The SU(3) equation of state
[DESY-18-001; arXiv:1801.03110]
A precise lattice determination of the equation of state in SU(3) Yang-Mills theory is carried out by means of a simulation algorithm, based on Jarzynski’s theorem, that allows one to compute physical quantities in thermodynamic equilibrium, by driving the field configurations of the system out of equilibrium. The physical results and the computational efficiency of the algorithm are compared with other state-of-the-art lattice calculations, and the extension to full QCD with dynamical fermions and to other observables is discussed..
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2018-09-18
10:53
OpenAccess [PUBDB-2018-03528] Preprint/Report
; ; ; et al
How perturbative are heavy sea quarks?
[DESY-18-134; HU-EP-18-28; WUB-18-03; arXiv:1809.03383]
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Effects of heavy sea quarks on the low energy physics are described by an effective theory where the expansion parameter is the inverse quark mass, 1/$M$. At leading order in 1/$M$ the dependence of any low energy quantity on $M$ is given in terms of the ratio of $\Lambda$ parameters of the effective and the fundamental theory [...]
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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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2018-09-05
11:45
OpenAccess [PUBDB-2018-03386] Preprint/Report
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Quantum computing of zeta-regularized vacuum expectation values
[DESY-18-139; arXiv:1808.06784]
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It has recently been shown that vacuum expectation values and Feynman path integrals can be regularized using Fourier Integral Operator $\zeta$-function, yet the physical meaning of these $\zeta$-regularized objects was unknown. Here we show that $\zeta$-regularized vacuum expectations appear as continuum limits using a certain discretization scheme. [...]
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2018-09-05
09:51
OpenAccess [PUBDB-2018-03371] Preprint/Report
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The spectrum of 2+1 dimensional Yang-Mills theory on a twisted spatial torus
[DESY-18-108; FTUAM-18-19; IFT-UAM-CSIC-18-71; HUPD-1804; arXiv:1807.03481]
 GO
We compute and analyse the low-lying spectrum of 2+1 dimensional SU(N) Yang-Mills theory on a spatial torus of size l × l with twisted boundary conditions. This paper extends our previous work [1]. [...]
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2018-08-07
09:19
OpenAccess [PUBDB-2018-02759] Preprint/Report
; ;
New extended interpolating fields built from three-dimensional fermions
[DESY-18-091; arXiv:1807.08714]
 GO
New extended interpolating operators made of quenched three dimensional fermions are introduced in the context of lattice QCD. The mass of the 3D fermions can be tuned in a controlled way to find a better overlap of the extended operators with the states of interest. [...]
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