ZEU-NIC

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2017-12-07
10:32
OpenAccess [PUBDB-2017-12818] Report/Journal Article
; ; ; et al
Nucleon transverse momentum-dependent parton distributions in lattice QCD: Renormalization patterns and discretization effects
[arXiv:1706.03406; LA-UR-17-24472] ddc:530
Lattice QCD calculations of transverse momentum-dependent parton distribution functions (TMDs) in nucleons are presented, based on the evaluation of nucleon matrix elements of quark bilocal operators with a staple-shaped gauge connection. Both time-reversal odd effects, namely, the generalized Sivers and Boer-Mulders transverse momentum shifts, as well as time-reversal even effects, namely, the generalized transversity and one of the generalized worm-gear shifts, are studied. [...]
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2017-11-13
09:42
OpenAccess [PUBDB-2017-11882] Preprint/Report
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Local multiboson factorization of the quark determinant
[HIM-2017-06; CERN-TH-2017-221; DESY-17-167; arXiv:1711.01592]
 GO
We discuss the recently proposed multiboson domain-decomposed factorization of the gauge-field dependence of the fermion determinant in lattice QCD. In particular, we focus on the case of a lattice divided in an arbitrary number of thick time slices. [...]
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2017-11-13
09:38
OpenAccess [PUBDB-2017-11880] Preprint/Report
; ; ; et al
SU(3) Yang Mills theory at small distances and fine lattices
[DESY-17-176; arXiv:1711.01860]
 GO
We investigate the SU(3) Yang Mills theory at small gradient flow time and at short distances. Lattice spacings down to $a=0.015$ fm are simulated with open boundary conditions to allow topology to flow in and out. [...]
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2017-11-13
09:12
OpenAccess [PUBDB-2017-11869] Preprint/Report
; ; ; et al
HQET form factors for $B_s\to K\ell\nu$ decays beyond leading order
[DESY-17-172; arXiv:1711.01158]
 GO
We compute semi-leptonic $B_s$ decay form factors using Heavy Quark Effective Theory on the lattice. To obtain good control of the $1/m_b$ expansion, one has to take into account not only the leading static order but also the terms arising at $O(1/m_b)$: kinetic, spin and current insertions. [...]
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2017-11-06
15:49
OpenAccess [PUBDB-2017-11705] Report/Journal Article
; ; ; et al
Gluon momentum fraction of the nucleon from lattice QCD
[arXiv:1611.06901; DESY-16-223] ddc:530
We perform a direct calculation of the gluon momentum fraction of the nucleon using maximally twisted mass fermion ensembles with $N_f=2+1+1$ flavors at a pion mass of about $370\,\mathrm{MeV}$ and a lattice spacing of $a\approx 0.082\,\mathrm{fm}$ and with $N_f=2$ flavors at the physical pion mass and a lattice spacing of $a\approx 0.093\,\mathrm{fm}$. In the definition of the gluon operator we employ stout smearing to obtain a statistically significant result for the bare matrix elements. [...]
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2017-11-02
11:15
OpenAccess [PUBDB-2017-11647] Preprint/Report
; ; ; et al
Higgs-Yukawa model on the lattice
[DESY-17-164; arXiv:1710.09737]
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We present results from two projects on lattice calculations for the Higgs-Yukawa model. First we report progress on the search of first-order thermal phase transitions in the presence of a dimension-six operator, with the choices of bare couplings that lead to viable phenomenological predictions. [...]
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2017-11-02
11:13
OpenAccess [PUBDB-2017-11646] Preprint/Report
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Multi-boson block factorization of fermions
[CERN-TH-2017-195; DESY-17-170; HIM-2017-07; arXiv:1710.09212]
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The numerical computations of many quantities of theoretical and phenomenological interest are plagued by statistical errors which increase exponentially with the distance of the sources in the relevant correlators. Notable examples are baryon masses and matrix elements, the hadronic vacuum polarization and the light-by-light scattering contributions to the muon g-2, and the form factors of semileptonic B decays. [...]
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2017-11-02
09:42
OpenAccess [PUBDB-2017-11641] Preprint/Report
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Large $N$ scaling and factorization in $\mathrm{SU}(N)$ Yang-Mills theory
[DESY-17-153; arXiv:1710.06057]
 GO
We present results for Wilson loops smoothed with the Yang-Mills gradient flow and matched through the scale $t_0$. They provide renormalized and precise operators allowing to test the $1/N^2$ scaling both at finite lattice spacing and in the continuum limit. [...]
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2017-10-26
15:14
OpenAccess [PUBDB-2017-11580] Report/Journal Article
; ; ; et al
QCD Coupling from a Nonperturbative Determination of the Three-Flavor Λ Parameter
[CERN-TH-2017-129; DESY-17-088; WUB-17-03; arXiv:1706.03821] ddc:550
We present a lattice determination of the $\Lambda$ parameter in three-flavor QCD and the strong coupling at the Z pole mass. Computing the nonperturbative running of the coupling in the range from $0.2\,$GeV to $70\,$GeV, and using experimental input values for the masses and decay constants of the pion and the kaon, we obtain $\Lambda_{\overline{\rm MS}}^{(3)}=341(12)\,$MeV. [...]
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2017-10-26
14:20
OpenAccess [PUBDB-2017-11576] Report/Journal Article
; ; ; et al
Nucleon Spin and Momentum Decomposition Using Lattice QCD Simulations
[arXiv:1706.02973] ddc:550
We determine within lattice QCD the nucleon spin carried by valence and sea quarks and gluons.The calculation is performed using an ensemble of gauge configurations with two degenerate light quarks with mass fixed to approximately reproduce the physical pion mass.We find that the total angular momentum carried by the quarks in the nucleon is $J_{u+d+s}$ = 0.408(61)$_{stat}$(48)$_{syst}$ and the gluon contribution is $J_g$ = 0.133(11)$_{stat}$(14)$_{syst}$, giving a total of $J_N$ = 0.54(6)$_{stat}$(5)$_{syst}$ that is consistent with the spin sum. For the quark intrinsic spin contribution, we obtain $\frac 1{2} \Delta \Sigma _{u+d+s}$ 0.201(17)$_{stat}$(5)$_{syst}$. [...]
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