Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: QCD sum rules for J/psi in the nuclear medium: calculation of the Wilson
  coefficients of gluon operators up to dimension 6   We calculate the Wilson coefficients of all dimension 6 gluon operators with
non zero spin in the correlation function between two heavy vector currents.
For the twist-4 part, we first identify the three independent gluon operators,
and then proceed with the calculation of the Wilson coefficients using the
fixed point gauge. Together with the previous calculation of the Wilson
coefficients for the dimension 6 scalar gluon operators by Nikolaev and
Radyushkin, our result completes the list of all the Wilson coefficients of
dimension 6 gluon operators in the correlation function between heavy vector
currents. We apply our results to investigate the mass of $J/\psi$ in nuclear
matter using QCD sum rules. Using an upper bound estimate on the matrix
elements of the dimension 6 gluon operators to linear order in density, we find
that the density dependent contribution from dimension 6 operators is less than
40% of the dimension 4 operators with opposite sign. The final result gives
about -4 MeV mass shift for the charmonium at rest in nuclear matter.

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The categories of this paper are: gr-qc
1
The categories of this paper are: cs
13
The categories of this paper are: quant-ph
15
The categories of this paper are: nucl-ex
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
2
The categories of this paper are: math
35
The categories of this paper are: mtrl-th
26
The categories of this paper are: bayes-an
16
The categories of this paper are: stat
8
The categories of this paper are: hep-ex
29
The categories of this paper are: funct-an
30
The categories of this paper are: q-alg
24
The categories of this paper are: dg-ga
19
The categories of this paper are: eess
6
The categories of this paper are: astro-ph