Abstract
We examine the role played in double parton interactions (DPI) by the parton--parton correlations originating from perturbative QCD parton splittings. Also presented are the results of the numerical analysis of the integrated DPI cross sections at Tevatron and LHC energies. To obtain the numerical results the knowledge of the single-parton GPDs gained by the HERA experiments was used to construct the non-perturbative input for generalized double parton distributions. The perturbative two-parton correlations induced by three-parton interactions contribute significantly to resolution of the longstanding puzzle of an excess of multi-jet production events in the back-to-back kinematics observed at the Tevatron.
Highlights
The field of multiple hard parton interactions (MPI) is an important element of the picture of strong interactions at high energies
In [18] we have studied how perturbative QCD phenomena affect two-parton correlations
The double-parton interactions (DPI) cross section extracted by the CDF and D0 at xi ∼ 0.01 turned out to be a factor of 2 larger than the expectation based on the approximation of independent partons in the proton with the transverse distance spread extracted from the HERA data [15,16]
Summary
The field of multiple hard parton interactions (MPI) is an important element of the picture of strong interactions at high energies. -dependence of the corresponding part of 2GPD, we have exploited the existing experimental information obtained by the HERA experiments This model disregards (rather arbitrarily, for lack of anything better) any long-range correlations between the partons in the proton wave function, which approximation seems reasonable in a limited range of parton momenta 10−1 > xi > 10−3 The DPI cross section extracted by the CDF and D0 at xi ∼ 0.01 turned out to be a factor of 2 larger than the expectation based on the approximation of independent partons in the proton with the transverse distance spread extracted from the HERA data [15,16] This observation does not exclude the presence of genuinely non-perturbative correlations between partons in the proton.
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