Probing small $x$ parton densities in ultraperipheral $AA$ and $pA$ collisions at the LHC

Details Probing small $x$ parton densities in ultraperipheral $AA$ and $pA$ collisions at the LHC Probing small $x$ parton densities in ultraperipheral $AA$ and $pA$ collisions at the LHC

2005-08-29

arxiv.org/abs/hep-ph/0508296v1

Phys.Rev.Lett.96:082001,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

Submitted to Phys. Rev. Lett., 4 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.96.082001

We calculate production rates for several hard processes in ultraperipheral proton-nucleus and nucleus-nucleus collisions at the LHC. The resulting high rates demonstrate that some key directions in small $x$ research proposed for HERA will be accessible at the LHC through these ultraperipheral processes. Indeed, these measurements can extend the HERA $x$ range by roughly a factor of 10 for similar virtualities. Nonlinear effects on the parton densities will thus be significantly more important in these collisions than at HERA.

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