Azimuthal anisotropy of direct photons

Abstract

The electromagnetic bremsstrahlung produced by a quark interacting with nucleons or nuclei is azimuthally asymmetric. In the light-cone dipole approach this effect is related to the orientation dependent dipole cross section. Such a radiation anisotropy is expected to contribute to the azimuthal asymmetry of direct photons in pA and AA collisions, as well as in DIS and in the production of dileptons.

Equations (23), (26) and the figures are corrected, references added. The version to appear in Phys. Rev. D

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• Drell-Yan diffraction: breakdown of QCD factorisation
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• Diffraction on Nuclei: Effects of Nucleon Correlations
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