ZEU-NIC

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2017-06-19
14:10
OpenAccess [PUBDB-2017-05459] Journal Article
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Up, down, and strange nucleon axial form factors from lattice QCD
ddc:530
We report a calculation of the nucleon axial form factors $G^{q}_{A}(Q^{2})$ and $G^{q}_{P}(Q^{2})$ for all three light quark flavors $q ∈ {u,d,s}$ in the range $0 ≤ Q^2 ≲ 1.2  GeV^2$ using lattice QCD. This work was done using a single ensemble with pion mass 317 MeV and made use of the hierarchical probing technique to efficiently evaluate the required disconnected loops [...]
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2017-06-14
15:34
OpenAccess [PUBDB-2017-04977] Journal Article
; ; ; et al
First physics results at the physical pion mass from $N _f$ = 2 Wilson twisted mass fermions at maximal twist
ddc:530
We present physics results from simulations of QCD using $N _f$ = 2 dynamical Wilson twisted mass fermions at the physical value of the pion mass. These simulations are enabled by the addition of the clover term to the twisted mass quark action [...]
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2017-05-08
16:23
OpenAccess [PUBDB-2017-02420] Journal Article
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Setting the scale for the CLS 2 + 1 flavor ensembles
ddc:530
We present measurements of a combination of the decay constants of the light pseudoscalar mesons and the gradient flow scale t$_0$, which allow us to set the scale of the lattices generated by CLS with 2+1 flavors of nonperturbatively improved Wilson fermions. Mistunings of the quark masses are corrected for by measuring the derivatives of observables with respect to the bare quark masses..
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2017-03-13
15:10
OpenAccess [PUBDB-2017-01363] Journal Article
; ; ; et al
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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