QCD Rescattering and High Energy Two-Body Photodisintegration of the Deuteron Page: 4 of 4
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It is worth noting that the deviations from the cal-
culation based on the approximation C(cm) 1 seem
to be consistent with C being a function of ,m only.
Such a dependence may easily occur in the quark ex-
change mechanism (see discussion above). In particular
the whole set of available data can be described by taking
C(tN/s) 1+2t /s' 1+t/,' including even the data at
0,m 36 , where -t < 2 GeV2 and the hard interaction
mechanism can not be applied. This may indicate that
connection between NN and yd -> pn dynamics extends
to a transitional region of t. More detailed measurements
of angular dependence with an extended range of energies
will allow a verification of such a scaling pattern.
1 1.5 2.5 3 3.5 4.5 5 .5
1 1. 2 2.5 3 3.5 4 5 5.5
FIG. 2. The scaled differential cross sections as a function
of the photon energy, for different values of cm angle. Data
are from  (triangles) and  (squares).
One expects also that the photodisintegration reac-
tions would ultimately be able to address many problems
of QCD known from the hard exclusive two-body reac-
tions. More data, especially with a two proton final state
(i.e. _y +3 He -> pp (high pt) + n (pt ~ 0)), and a more
detailed angular distribution would definitely allow such
investigations. The polarization measurement also will
be crucial especially at the same s where anomalies ob-
served in hard pp scattering. Another important exten-
sion would be similar experiments using virtual photons.
Although Eq. (6) is obtained utilizing only the quark
interchange mechanism, the agreement of Fig.2 may sug-
gest that the result is more general - any hard interac-
tion mechanism for yd -> hadrons reaction could be ex-
pressed through the contribution to hadron-hadron hard
scattering amplitude. Thus, the present calculations
could be extended to reactions with other composition of
final high pt hadrons such as: (yd -> AKN or ACDN).
The agreement with the recently measured cross sec-
tions of yd -> pn reaction suggests that such a rescat-
tering mechanism could be important for any high mo-
mentum transfer nuclear reaction. More detailed data
for angular distributions and final states involving differ-
ent polarizations and compositions of final hadrons could
provide an entirely new tool for the investigation of QCD
dynamics of high energy nuclear reactions.
We thank S. Brodsky, A. Dieperink, S. Nagorny for
useful discussions and R. Holt and H. Gao for providing
and explaining the experimental data. This work was
supported in part by the U.S. Department of Energy and
by the Academy of Science of Israel.
* Present Address: Department of Physics, Florida In-
ternational University, Miami, FL 33199, USA.
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 The light cone four - momentum is defined as p -
(p+,p-,p__), where p+ -E + p2. Here the z axis is de-
fined to point in the direction opposite to the photon.
 We neglect the contribution of contact terms in the quark
propagators, since they contribute only through the hard
component of the deuteron wave function.
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Frankfurt, Leonid L.; Miller, Gerald A.; Sargsian, Misak M. & Strikman, Mark I. QCD Rescattering and High Energy Two-Body Photodisintegration of the Deuteron, article, January 1, 2000; Newport News, Virginia. (digital.library.unt.edu/ark:/67531/metadc741859/m1/4/: accessed December 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.