Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Correction to the Hamiltonian of the QCD String with Quarks due to the
  Rigidity Term   A correction to the Hamiltonian of the quark-antiquark system, arising due to
the rigidity term in the gluodynamics string effective action, is obtained.
This correction contains additional contributions to the orbital momentum of
the system and several higher derivative operators. With the help of the
derived Hamiltonian a rigid string-induced term in the Hamiltonian of the
relativistic quark model is evaluated for the case of large masses of a quark
and antiquark.

23
The categories of this paper are: solv-int
0
The categories of this paper are: hep-ph
28
The categories of this paper are: alg-geom
21
The categories of this paper are: adap-org
11
The categories of this paper are: hep-lat
16
The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg
17
The categories of this paper are: q-fin
14
The categories of this paper are: math-ph
6
The categories of this paper are: astro-ph
2
The categories of this paper are: math
25
The categories of this paper are: patt-sol
24
The categories of this paper are: dg-ga
12
The categories of this paper are: nucl-th
33
The categories of this paper are: plasm-ph