Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The strange quark contribution to the spin of the nucleon   Quark line disconnected matrix elements of an operator, such as the axial
current, are difficult to compute on the lattice. The standard method uses a
stochastic estimator of the operator, which is generally very noisy. We discuss
and develop further our alternative approach using the Feynman-Hellmann theorem
which involves only evaluating two-point correlation functions. This is applied
to computing the contribution of the quark spin to the nucleon and in
particular for the strange quark. In this process we also pay particular
attention to the development of an SU(3) flavour breaking expansion for singlet
operators.

2
The categories of this paper are: math
16
The categories of this paper are: stat
10
The categories of this paper are: q-bio
17
The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom
15
The categories of this paper are: nucl-ex
31
The categories of this paper are: ao-sci
30
The categories of this paper are: q-alg
7
The categories of this paper are: hep-th
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
29
The categories of this paper are: funct-an