Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: FLAVOR-SINGLET g_A FROM LATTICE QCD   We report on a lattice QCD calculation of the flavor-singlet axial coupling
constant $g_A$ of the proton from the axial-vector current. The simulation is
carried out at $\beta = 6$ on a quenched $16^3 \times 24$ lattice. An
extrapolation to the chiral limit shows that the connected insertion (valence
and cloud parts) is $0.62 \pm 0.09$, which is close to $g_A^8$. The
disconnected insertion (vacuum polarization from the sea quark) for the $u$ or
$d$ quark is $- 0.12\pm 0.01 $ and the $s$ quark also contributes $-0.12\pm
0.01$. The total $g_A^1$ is thus $0.25 \pm 0.12$ which is in agreement with
experiments. In addition, we find $g_A^3 = 1.20 \pm 0.11$, $g_A^8 = 0.61 \pm
0.13$ and $F_A/D_A = 0.60 \pm 0.02$, also in agreement with experiments.

9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph
33
The categories of this paper are: plasm-ph
4
The categories of this paper are: cond-mat
1
The categories of this paper are: cs
36
The categories of this paper are: cmp-lg
16
The categories of this paper are: stat
6
The categories of this paper are: astro-ph
24
The categories of this paper are: dg-ga
5
The categories of this paper are: gr-qc
17
The categories of this paper are: q-fin
37
The categories of this paper are: supr-con
15
The categories of this paper are: nucl-ex
12
The categories of this paper are: nucl-th