ZEU-NIC

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2019-03-14
15:26
OpenAccess [PUBDB-2019-01546] Preprint/Report
et al
Conformal field theory and the hot phase of three-dimensional U(1) gauge theory
[arXiv:1903.00491; DESY-19-027]
 GO
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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2019-02-19
13:14
OpenAccess [PUBDB-2019-01169] Report/Journal Article

Large $N$ scaling and factorization in SU($N$) Yang-Mills gauge theory
[DESY-18-075; arXiv:1805.11070]
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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2019-02-11
09:44
OpenAccess [PUBDB-2019-01028] Journal Article

Nonperturbative renormalization and $O(a )$-improvement of the nonsinglet vector current with $N_f = 2 + 1$ Wilson fermions and tree-level Symanzik improved gauge action
In calculating hadronic contributions to precision observables for tests of the Standard Model in lattice QCD, the electromagnetic current plays a central role. Using a Wilson action with $O(a)$ improvement in QCD with $N_ f$ flavors, a counterterm must be added to the vector current in order for its on-shell matrix elements to be $O(a)$ improved. [...]
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2019-01-29
10:01
OpenAccess [PUBDB-2019-00846] Report/Journal Article
et al
Separated Kaon Electroproduction Cross Section and the Kaon Form Factor from 6 GeV JLab Data
[JLAB-PHY-18-2645; arXiv:1801.01536]
The H1(e,e′K+)Λ reaction was studied as a function of the Mandelstam variable −t using data from the E01-004 (FPI-2) and E93-018 experiments that were carried out in Hall C at the 6 GeV Jefferson Laboratory. The cross section was fully separated into longitudinal and transverse components, and two interference terms at four-momentum transfers Q2 of 1.00, 1.36, and 2.07GeV2. [...]
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2019-01-16
11:53
OpenAccess [PUBDB-2019-00523] Report/Contribution to a conference proceedings

Systematics in nucleon matrix element calculations
[DESY-18-224, arXiv:1812.10574]
36th International Symposium on Lattice Field Theory, LATTICE 2018, East LansingEast Lansing, USA, 22 Jul 2018 - 28 Jul 20182018-07-222018-07-28 15 pp. () [10.3204/PUBDB-2019-00523]  GO
The current status of calculations of simple nucleon structure observables is reviewed, with a focus on the axial charge. A major challenge is the combination of an exponentially decaying signal-to-noise ratio and the need for large source-sink separations to eliminate excited-state contributions; efforts to understand and deal with this problem are the focus of the largest section of this review. [...]
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2019-01-14
15:08
OpenAccess [PUBDB-2019-00443] Preprint/Report
et al
Proton and neutron electromagnetic form factors from lattice QCD
[arXiv:1812.10311; DESY-18-033]
 GO
The electromagnetic form factors of the proton and the neutron are computed within lattice QCD using simulations of maximally twisted mass fermions with masses fixed to their physical values. We analyse two new ensembles of $N_f=2$ and $N_f=2+1+1$ and use several values of the sink-source time separation in the range of 1.0 fm to 1.6 fm to ensure ground state identification. [...]
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2019-01-03
15:05
OpenAccess [PUBDB-2019-00034] Report/Journal Article

Nonperturbative Renormalization of Nonlocal Quark Bilinears for Parton Quasidistribution Functions on the Lattice Using an Auxiliary Field
[DESY-17-109; arXiv:1707.07152]
Quasi-PDFs provide a path toward an ab initio calculation of parton distribution functions (PDFs) using lattice QCD. One of the problems faced in calculations of quasi-PDFs is the renormalization of a nonlocal operator. [...]
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2019-01-03
11:25
OpenAccess [PUBDB-2019-00019] Journal Article/Report/Contribution to a conference proceedings
et al
Hadronic light-by-light scattering contribution to the muon $g-2$ on the lattice
[DESY-18-007; MITP-18-001; arXiv:1801.04238]
International Workshop on “Flavour Changing and Conserving Processes, FCCP2017, AnacapriAnacapri, Italy, 7 Sep 2017 - 9 Sep 20172017-09-072017-09-09 The European physical journal / Web of Conferences 179, 01017 () [10.1051/epjconf/201817901017]  GO
We briefly review several activities at Mainz related to hadronic light-by-light scattering (HLbL) using lattice QCD. First we present a position-space approach to the HLbL contribution in the muon g-2, where we focus on exploratory studies of the pion-pole contribution in a simple model and the lepton loop in QED in the continuum and in infinite volume. [...]
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2019-01-03
11:18
OpenAccess [PUBDB-2019-00018] Journal Article/Report/Contribution to a conference proceedings
et al
Connected and disconnected contributions to nucleon axial form factors using $\mathrm{N_f = 2}$ twisted mass fermions at the physical point
[arXiv:1807.11203]
35th International Symposium on Lattice Field Theory, Lattice 2017, GranadaGranada, Spain, 18 Jun 2017 - 24 Jun 20172017-06-182017-06-24 The European physical journal / Web of Conferences 175, 06003 () [10.1051/epjconf/201817506003]  GO
We present results on the isovector and isoscalar nucleon axial form factors including disconnected contributions, using an ensemble of N$_f$ = 2 twisted mass cloverimproved Wilson fermions simulated with approximately the physical value of the pion mass. The light disconnected quark loops are computed using exact deflation, while the strange and the charm quark loops are evaluated using the truncated solver method. [...]
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2019-01-03
11:12
OpenAccess [PUBDB-2019-00017] Journal Article/Report/Contribution to a conference proceedings
et al
Nucleon spin structure from lattice QCD
[arXiv:1807.11214]
XXVI International Workshop on Deep-Inelastic Scattering and Related Subjects, DIS2018, KobeKobe, Japan, 10 Apr 2018 - 20 Apr 20182018-04-102018-04-20 Proceedings of Science / International School for Advanced Studies (DIS2018), 148 () [10.22323/1.316.0148]  GO
In this lattice QCD study we evaluate the nucleon spin decomposition to quarks and gluons con-tributions. We employ one gauge ensemble of maximally twisted mass fermions with two degen-erate light quarks tuned to approximately reproduce the physical pion mass [...]
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