ZEU-NIC

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2017-08-29
09:34
OpenAccess [PUBDB-2017-10004] Report/Journal Article
; ; ; et al
Nucleon electromagnetic form factors using lattice simulations at the physical point
[arXiv:1706.00469] ddc:530
We present results for the nucleon electromagnetic form factors using an ensemble of maximally twisted mass clover-improved fermions with pion mass of about 130 MeV. We use multiple sink-source separations and three analysis methods to probe ground-state dominance [...]
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2017-08-16
15:57
OpenAccess [PUBDB-2017-09401] Report/Journal Article
; ; ; et al
Updated lattice results for parton distributions
[DESY-16-192; arXiv:1610.03689] ddc:530
We provide a high statistics analysis of the $x$-dependence of the bare unpolarized, helicity and transversity iso-vector parton distribution functions (PDFs) from lattice calculations employing (maximally) twisted mass fermions. The $x$-dependence of the calculated PDFs resembles those of the phenomenological parameterizations, a feature that makes this approach promising despite the lack of a full renormalization program for them. [...]
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2017-07-03
15:01
OpenAccess [PUBDB-2017-06705] Report/Journal Article
; ; ; et al
Nucleon scalar and tensor charges using lattice QCD simulations at the physical value of the pion mass
[arXiv:1703.08788] ddc:530
We present results on the light, strange and charm nucleon scalar and tensor charges from lattice QCD, using simulations with $N_f$ = 2 flavors of twisted mass clover-improved fermions with a physical value of the pion mass. Both connected and disconnected contributions are included, enabling us to extract the isoscalar, strange and charm charges for the first time directly at the physical point [...]
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2017-06-19
14:10
OpenAccess [PUBDB-2017-05459] Journal Article
; ; ; et al
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
; ;
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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