Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quarkonium Decay Matrix Elements from Quenched Lattice QCD   We calculate the long-distance matrix elements for the decays of the
lowest-lying S- and P-wave states of charmonium and bottomonium in quenched
lattice QCD, using a nonrelativistic formulation for the heavy quarks. (The
short-distance coefficients are known from perturbation theory.) In particular,
we present the first calculation from QCD first principles of the color-octet
contribution to P-wave decay---a contribution that is absent in potential
models. We also give the relations between the lattice matrix elements and
their continuum counterparts through one-loop order in perturbation theory.

22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
30
The categories of this paper are: q-alg
36
The categories of this paper are: cmp-lg
21
The categories of this paper are: adap-org
17
The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs
3
The categories of this paper are: physics
34
The categories of this paper are: chem-ph
14
The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex
20
The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int
12
The categories of this paper are: nucl-th