Abstract
We use the spinor helicity formalism to calculate the cross section for production of three partons of a given polarization in Deep Inelastic Scattering (DIS) off proton and nucleus targets at small Bjorken x. The target proton or nucleus is treated as a classical color field (shock wave) from which the produced partons scatter multiple times. The resulting expressions are used to study azimuthal angular correlations between produced partons in order to probe the gluon structure of the target hadron or nucleus as well as to study energy loss in DIS reactions.
Highlights
As a result one obtains a non-linear generalization of the BFKL evolution equation [4,5,6], which includes multiple-scattering effects; the latter provide the necessary slow down and saturation of the growth with energy, see [7] and references therein
The perturbative Regge limit of Quantum Chromodynamics (QCD) – which is characterized by the presence of a hard scale Q2 far bigger than the QCD confinement scale and high center of mass energy s, such that x = Q2/s 1 – continues to provide challenges to those who wish to explore it
While the above mentioned non-linear dynamics is of high interest and many efforts are dedicated towards its exploration, one finds at the same time that at current collider energies, linear low x evolution provides a pretty good description of data, see for instance the study [8] of exclusive vector meson production, where the energy dependence results directly of the NLO BFKL fit of [9]
Summary
As a result one obtains a non-linear generalization of the BFKL evolution equation [4,5,6], which includes multiple-scattering effects; the latter provide the necessary slow down and saturation of the growth with energy, see [7] and references therein While the above mentioned non-linear dynamics is of high interest and many efforts are dedicated towards its exploration, one finds at the same time that at current collider energies, linear low x evolution provides a pretty good description of data, see for instance the study [8] of exclusive vector meson production, where the energy dependence results directly of the NLO BFKL fit of [9].
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