Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Estimate of crossed-boson-exchange contributions to the binding energy
  of two-body systems   Binding energies calculated from using the Bethe-Salpeter equation in the
simplest ladder approximation significantly differ from those obtained in the
non-relativistic standard instantaneous approximation. While they should a
priori be better, they turn out to be further away from an exact calculation in
the case of scalar neutral particles or from experiment in the case of the
Coulomb interaction. Part of the discrepancy is due to the omission in the
interaction kernel of contributions corresponding to crossed-boson-exchange
diagrams. The role of these contributions is examined numerically, using a
simple approximation. The sensitivity to both the coupling constant and the
mass of the exchanged boson is considered.

26
The categories of this paper are: bayes-an
37
The categories of this paper are: supr-con
4
The categories of this paper are: cond-mat
15
The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg
35
The categories of this paper are: mtrl-th
23
The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
19
The categories of this paper are: eess
9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph
2
The categories of this paper are: math
20
The categories of this paper are: acc-phys
34
The categories of this paper are: chem-ph
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an