Description of the model
Comparison to DVCS data
Compton Form Factors
of proton and neutron
(with downloads)
DVCS asymmetries
ALU, AC and AUT
of proton and neutron
(with downloads)
Nuclear GPDs and nuclear DVCS asymmetries
(with downloads)
Back to V.Guzey at PNPI |
Nuclear DVCS beam-spin asymmetry ALU
We used a simple model of nuclear GPDs in
terms of
the nucleon GPDs
(A. Kirchner and D. Mueller, Eur. Phys. J. C 32, 347 (2003)).
This allowed us to express nuclear CFFs in terms of nucleon
CFFs.
The latter are given by the Dual
Parameterization of nucleon GPDs (V. Guzey and T.
Teckentrup, Phys. Rev. D 74, 054027 (2006)).
Note:
The factor of two in the definition/normalization of the
GPDs was missing in V. Guzey and T. Teckentrup, Phys. Rev. D 74,
054027 (2006)
.
This is corrected in V. Guzey, T. Teckentrup, Phys. Rev. D. 79 , 017501 (2009)
[arXiv:0810.3899 [hep-ph]].
The data
files below correspond to the corrected predictions.
Combining those nuclear CFFs with the BMK expressions for DVCS
asymmetries (A.V. Belitsky, D. Mueller and A. Kirchner, Nucl. Phys.
B629 (2002) 323),
we obtained predictions for the ALU
nuclear DVCS asymmetry for a wide range of nuclei.
Below are links to the FORTRAN codes allowing to calculate ALU
for 4He, 14N,
20Ne, 84Kr
and 131Xe for the kinematics covered by
the grids for the nucleon CFFs: 0.01 < xB
< 0.5, 1 < Q2 < 10 GeV2
and 0.005 < |t| < 1 GeV2,
and for a wide range of Ju and Jd,
-0.6 < Ju < 0.6 and -1
< Jd < 1.
The energy and the charge of the beam is specified by the user.
All commentaries related to the use of the codes are found in the
codes.
|