20191113 13:58 
[PUBDB201904199]
Report/Journal Article
Green, J. R. ; Engelhardt, M. ; Hasan, N. ; et al
Excitedstate effects in nucleon structure on the lattice using hybrid interpolators
[ arXiv:1907.11950, DESY 19132]
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ddc:530
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20191104 14:16 
[PUBDB201903879]
Journal Article
Feindt, U. ; Nordin, J. ; Rigault, M. ; et al
simsurvey : estimating transient discovery rates for the Zwicky transient facility
ddc:530
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20191024 14:02 
[PUBDB201903777]
Journal Article
Hartung, T. ; Jansen, K.
Zetaregularized vacuum expectation values
It has recently been shown that vacuum expectation values and Feynman path integrals can be regularized using the Fourier integral operator ζfunction, yet the physical meaning of these ζregularized objects was unknown. Here, we show that ζregularized vacuum expectations appear as continuum limits using a certain discretization scheme. [...]
ddc:510
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20190917 15:15 
[PUBDB201903375]
Report/Journal Article
Caselle, M. ; Nada, A. ; Panero, M. ; et al
Conformal field theory and the hot phase of threedimensional U(1) gauge theory
[arXiv:1903.00491; DESY19027]
We study the hightemperature phase of compact U(1) gauge theory in 2+1 dimensions, comparing the results of lattice calculations with analytical predictions from the conformalfieldtheory description of the lowtemperature phase of the bidimensional XY model. We focus on the twopoint correlation functions of probe charges and the fieldstrength operator, finding excellent quantitative agreement with the functional form and the continuously varying critical indices predicted by conformal field theory..
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ddc:530
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20190819 11:35 
[PUBDB201903032]
Report/Journal Article
Caselle, M. ; Magnoli, N. ; Nada, A. ; et al
Conformal perturbation theory confronts lattice results in the vicinity of a critical point
[arXiv:1904.12749; DESY19073]
We study the accuracy and predictive power of conformal perturbation theory by a comparison with lattice results in the neighborhood of the finitetemperature deconfinement transition of SU(2) YangMills theory, assuming that the infrared properties of this nonAbelian 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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ddc:530
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20190809 11:17 
[PUBDB201902964]
Preprint/Report
Green, J. R. ; Engelhardt, M. ; Hasan, N. ; et al
Excitedstate effects in nucleon structure on the lattice using hybrid interpolators
[arXiv:1907.11950; DESY19132]
It would be very useful to find a way of reducing excitedstate 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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20190805 15:34 
[PUBDB201902914]
Report/Journal Article
Giusti, L. ; Harris, T. ; Nada, A. ; et al
Frequencysplitting estimators of singlepropagator traces
[arXiv:1903.10447; DESY19046]
Singlepropagator traces are the most elementary fermion Wick contractions which occur in numerical lattice QCD, and are usually computed by introducing randomnoise 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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ddc:530
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20190801 11:09 
[PUBDB201902880]
Journal Article/Report/Contribution to a conference proceedings
Giusti, L. ; Harris, T. ; Nada, A. ; et al
Multilevel integration for meson propagators
[DESY18186; arXiv:1812.01875]
he computation of many correlation functions in lattice QCD is severely hindered by a signaltonoise problem. Recent developments in the factorization of both the fermion propagator and determinant pave the way for the implementation of multilevel Monte Carlo integration techniques for lattice QCD. [...]
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ddc:530
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20190715 15:41 
[PUBDB201902720]
Report/Journal Article
Alexandrou, C. ; Cichy, K. ; Constantinou, M. ; et al
Systematic uncertainties in parton distribution functions from lattice QCD simulations at the physical point
[arXiv:1902.00587]
We present a detailed study of the helicitydependent and helicityindependent collinear parton distribution functions (PDFs) of the nucleon, using the quasiPDF approach. The lattice QCD computation is performed employing twisted mass fermions with a physical value of the light quark mass [...]
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20190528 11:31 
[PUBDB201902384]
Report/Journal Article
Francis, A. ; Green, J. R. ; Junnarkar, P. M. ; et al
Lattice QCD study of the H dibaryon using hexaquark and twobaryon interpolators
[CERNTH2018098; DESY18066; HIM201802; MITP18030; TIFRTH1812; 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 twobaryon interpolating operators to isolate the ground state in the rest frame and in moving frames. [...]
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