ZEU-NIC

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2019-11-13
13:58
[PUBDB-2019-04199] Report/Journal Article
et al
Excited-state effects in nucleon structure on the lattice using hybrid interpolators
[ arXiv:1907.11950, DESY 19-132]
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2019-11-04
14:16
[PUBDB-2019-03879] Journal Article
et al
simsurvey : estimating transient discovery rates for the Zwicky transient facility
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2019-10-24
14:02
[PUBDB-2019-03777] Journal Article

Zeta-regularized vacuum expectation values
It has recently been shown that vacuum expectation values and Feynman path integrals can be regularized using the Fourier integral operator ζ-function, yet the physical meaning of these ζ-regularized objects was unknown. Here, we show that ζ-regularized vacuum expectations appear as continuum limits using a certain discretization scheme. [...]
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2019-09-17
15:15
OpenAccess [PUBDB-2019-03375] Report/Journal Article
et al
Conformal field theory and the hot phase of three-dimensional U(1) gauge theory
[arXiv:1903.00491; DESY-19-027]
We study the high-temperature phase of compact U(1) gauge theory in 2+1 dimensions, comparing the results of lattice calculations with analytical predictions from the conformal-field-theory description of the low-temperature phase of the bidimensional XY model. We focus on the two-point correlation functions of probe charges and the field-strength operator, finding excellent quantitative agreement with the functional form and the continuously varying critical indices predicted by conformal field theory..
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2019-08-19
11:35
OpenAccess [PUBDB-2019-03032] Report/Journal Article
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Conformal perturbation theory confronts lattice results in the vicinity of a critical point
[arXiv:1904.12749; DESY-19-073]
We study the accuracy and predictive power of conformal perturbation theory by a comparison with lattice results in the neighborhood of the finite-temperature deconfinement transition of SU(2) Yang-Mills theory, assuming that the infrared properties of this non-Abelian gauge theory near criticality can be described by the Ising model. The results of this comparison show that conformal perturbation theory yields quantitatively accurate predictions in a broad temperature range [...]
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2019-08-09
11:17
arXiv [PUBDB-2019-02964] Preprint/Report
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Excited-state effects in nucleon structure on the lattice using hybrid interpolators
[arXiv:1907.11950; DESY-19-132]
It would be very useful to find a way of reducing excited-state effects in lattice QCD calculations of nucleon structure that has a low computational cost. We explore the use of hybrid interpolators, which contain a nontrivial gluonic excitation, in a variational basis together with the standard interpolator with tuned smearing width. [...]
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2019-08-05
15:34
OpenAccess [PUBDB-2019-02914] Report/Journal Article
et al
Frequency-splitting estimators of single-propagator traces
[arXiv:1903.10447; DESY-19-046]
Single-propagator traces are the most elementary fermion Wick contractions which occur in numerical lattice QCD, and are usually computed by introducing random-noise estimators to profit from volume averaging. The additional contribution to the variance induced by the random noise is typically orders of magnitude larger than the one due to the gauge field [...]
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2019-08-01
11:09
OpenAccess [PUBDB-2019-02880] Journal Article/Report/Contribution to a conference proceedings
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Multi-level integration for meson propagators
[DESY-18-186; arXiv:1812.01875]
The 36th Annual International Symposium on Lattice Field Theory, LATTICE 2018, Michigan State UniversityMichigan State University, East Lansing, 22 Jul 2018 - 28 Jul 20182018-07-222018-07-28
Contributions / Info
Proceedings of Science / International School for Advanced Studies (LATTICE2018), 028 () [10.22323/1.334.0028]  GO
he computation of many correlation functions in lattice QCD is severely hindered by a signal-to-noise problem. Recent developments in the factorization of both the fermion propagator and determinant pave the way for the implementation of multi-level Monte Carlo integration techniques for lattice QCD. [...]
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2019-07-15
15:41
OpenAccess [PUBDB-2019-02720] Report/Journal Article
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Systematic uncertainties in parton distribution functions from lattice QCD simulations at the physical point
[arXiv:1902.00587]
We present a detailed study of the helicity-dependent and helicity-independent collinear parton distribution functions (PDFs) of the nucleon, using the quasi-PDF approach. The lattice QCD computation is performed employing twisted mass fermions with a physical value of the light quark mass [...]
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2019-05-28
11:31
OpenAccess [PUBDB-2019-02384] Report/Journal Article
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Lattice QCD study of the H dibaryon using hexaquark and two-baryon interpolators
[CERN-TH-2018-098; DESY-18-066; HIM-2018-02; MITP-18-030; TIFR-TH-18-12; arXiv:1805.03966]
We present a lattice QCD spectroscopy study in the isospin singlet, strangeness $-2$ sectors relevant for the conjectured $H$ dibaryon. We employ both hexaquark and two-baryon interpolating operators to isolate the ground state in the rest frame and in moving frames. [...]
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