Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nucleon matrix elements from lattice QCD with all-mode-averaging and a
  domain-decomposed solver: an exploratory study   We study the performance of all-mode-averaging (AMA) when used in conjunction
with a locally deflated SAP-preconditioned solver, determining how to optimize
the local block sizes and number of deflation fields in order to minimize the
computational cost for a given level of overall statistical accuracy. We find
that AMA enables a reduction of the statistical error on nucleon charges by a
factor of around two at the same cost when compared to the standard method. As
a demonstration, we compute the axial, scalar and tensor charges of the nucleon
in $N_f=2$ lattice QCD with non-perturbatively O(a)-improved Wilson quarks,
using O(10,000) measurements to pursue the signal out to source-sink
separations of $t_s\sim 1.5$ fm. Our results suggest that the axial charge is
suffering from a significant amount (5-10%) of excited-state contamination at
source-sink separations of up to $t_s\sim 1.2$ fm, whereas the excited-state
contamination in the scalar and tensor charges seems to be small.

9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
23
The categories of this paper are: solv-int
15
The categories of this paper are: nucl-ex
1
The categories of this paper are: cs
5
The categories of this paper are: gr-qc
19
The categories of this paper are: eess
21
The categories of this paper are: adap-org
16
The categories of this paper are: stat
20
The categories of this paper are: acc-phys
13
The categories of this paper are: quant-ph
6
The categories of this paper are: astro-ph
32
The categories of this paper are: atom-ph
31
The categories of this paper are: ao-sci