ZEU-NIC

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2017-04-28
13:19
[PUBDB-2017-02111] Report/Journal Article
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Comparative benchmarks of full QCD algorithms
[DESY-00-104; HU-EP-00-30; NIC-DESY-00-002; BICOCCA-FT-00-12; hep-lat/0009027] ddc:004
We report performance benchmarks for several algorithms that we have used to simulate the Schr'odinger functional with two flavors of dynamical quarks. They include hybrid and polynomial hybrid Monte Carlo with preconditioning. [...]
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2017-04-19
10:25
[PUBDB-2017-01687] Report/Journal Article
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Weak transition matrix elements from finite volume correlation functions
[hep-lat/0003023; CERN-TH-2000-091; CPT-2000-PE-3984; LAPTH-788-00] ddc:530
The two-body decay rate of a weakly decaying particle (such as the kaon) is shown to be proportional to the square of a well-defined transition matrix element in finite volume. Contrary to the physical amplitude, the latter can be extracted from finite-volume correlation functions in euclidean space without analytic continuation. [...]
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2017-04-19
10:22
DBCoverage [PUBDB-2017-01686] Report/Journal Article

Lattice regularization of chiral gauge theories to all orders of perturbation theory
[hep-lat/0006014; CERN-TH-2000-165] ddc:530
In the framework of perturbation theory, it is possible to put chiral gauge theories on the lattice without violating the gauge symmetry or other fundamental principles, provided the fermion representation of the gauge group is anomaly-free. The basic elements of this construction (which starts from the Ginsparg-Wilson relation) are briefly recalled and the exact cancellation of the gauge anomaly, at any fixed value of the lattice spacing and for any compact gauge group, is then proved rigorously through a recursive procedure..
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2017-03-13
15:10
OpenAccess [PUBDB-2017-01363] Journal Article
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Review of lattice results concerning low-energy particle physics
ddc:530
We review lattice results related to pion, kaon, D- and B-meson physics with the aim of making them easily accessible to the particle-physics community. More specifically, we report on the determination of the light-quark masses, the form factor $f_+$(0), arising in the semileptonic $K → π$ transition at zero momentum transfer, as well as the decay constant ratio $f_{K}/f_π$ and its consequences for the CKM matrix elements Vus and Vud. [...]
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2017-03-03
11:01
OpenAccess [PUBDB-2017-01277] Journal Article
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Local factorization of the fermion determinant in lattice QCD
ddc:530
We introduce a factorization of the fermion determinant in lattice QCD with Wilson-type fermions that leads to a bosonic action which is local in the block fields. The interaction among gauge fields on distant blocks is mediated by multiboson fields located on the boundaries of the blocks. [...]
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2017-02-20
16:09
OpenAccess [PUBDB-2017-01039] Journal Article
; ; ; et al
Slow running of the gradient flow coupling from 200 MeV to 4 GeV in $N_f$ = 3 QCD
ddc:530
Using a finite volume gradient flow renormalization scheme with Schrödinger Functional boundary conditions, we compute the nonperturbative running coupling in the range 2.2≲$g^{2}_{GF}$(L)≲13. Careful continuum extrapolations turn out to be crucial to reach our high accuracy. [...]
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2017-02-20
15:57
OpenAccess [PUBDB-2017-01038] Preprint/Report
; ; ; et al
Review of lattice results concerning low-energy particle physics
[DESY-16-111; CP3-Origins-2016-023 DNRF90; DIAS-2016-23; Edinburgh 2016/11; FTUAM-16-23; HIM-2016-02; IFT-UAM/CSIC-16-057; LPT-Orsay-16-47; MITP/16-059; RM3-TH/16-7; ROM2F/2016/05; YITP-16-77; arXiv:1607.0299]
 GO
We review lattice results related to pion, kaon, D- and B-meson physics with the aim of making them easily accessible to the particle physics community. More specifically, we report on the determination of the light-quark masses, the form factor $f_+$(0), arising in the semileptonic K $\to \pi$ transition at zero momentum transfer, as well as the decay constant ratio $f_{K}/f_{\pi}$ and its consequences for the CKM matrix elements V$_{us}$ and V$_{ud}$. [...]
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2017-01-16
07:27
OpenAccess [PUBDB-2017-00567] Journal Article/Report/Contribution to a conference proceedings
; ; ; et al
Extraction of the bare form factors for the semi-leptonic B$_s$ decays
[DESY-16-251; arXiv:1701.03299]
34th annual International Symposium on Lattice Field Theory, Meeting locationSouthampton, UK, 24 Jul 2016 - 30 Jul 20162016-07-242016-07-30
Proceedings of Science (2016) [10.3204/PUBDB-2017-00567]  GO
ddc:530
The computation of the form factors for the $B_s \to K \ell \nu$ decay is presented. The b quark is treated by means of Heavy Quark Effective Theory, currently in the static approximation. [...]
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2017-01-16
07:20
OpenAccess [PUBDB-2017-00566] Journal Article/Report/Contribution to a conference proceedings
; ; ; et al
The $\Lambda$-parameter in 3-flavour QCD and $\alpha_s(m_Z)$ by the ALPHA collaboration
[CERN-TH-2016-262; DESY-17-007; arXiv:1701.03075]
34th annual International Symposium on Lattice Field Theory, Meeting locationSouthampton, UK, 24 Jul 2016 - 30 Jul 20162016-07-242016-07-30
Proceedings of Science (2016) [10.3204/PUBDB-2017-00566]  GO
ddc:530
We present results by the ALPHA collaboration for the $\Lambda$-parameter in 3-flavour QCD and the strong coupling constant at the electroweak scale, $\alpha_s(m_Z)$, in terms of hadronic quantities computed on the CLS gauge configurations. The first part of this proceedings contribution contains a review of published material \cite{Brida:2016flw,DallaBrida:2016kgh} and yields the $\Lambda$-parameter in units of a low energy scale, $1/L_{\rm had}$. [...]
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2017-01-12
08:42
OpenAccess [PUBDB-2017-00538] Journal Article/Report/Contribution to a conference proceedings
; ; ; et al
Recent results for the proton spin decomposition from lattice QCD
[DESY-16-175; arXiv:1609.00253]
XXIV International Workshop on Deep-Inelastic Scattering and Related, Meeting locationHamburg, Germany, 11 Apr 2016 - 15 Apr 20162016-04-112016-04-15
Proceedings of Science (DIS2016), 240 (2016) [10.3204/PUBDB-2017-00538]  GO
ddc:530
The exact decomposition of the proton spin has been a much debated topic, on the experimental as well as the theoretical side. In this talk we would like to report on recent non-perturbative results and ongoing efforts to explore the proton spin from lattice QCD. [...]
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