Phys. Rev. Lett. 102, 232001 (2009) [4 pages]Tracking Fast Small Color Dipoles through Strong Gluon Fields at the LHCReceived 22 November 2008; published 9 June 2009 We argue that the process γ+A→J/ψ+“gap”+X at large momentum transfer q2 provides a quick and effective way to test the onset of a novel perturbative QCD regime of strong absorption for the interaction of small dipoles at the collider energies. We find that already the first heavy-ion run at the LHC will allow one to study this reaction with sufficient statistics via ultraperipheral collisions, hence probing the interaction of qq̅ dipoles of sizes ∼0.2 fm with nuclear media down to x∼10-5. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.102.232001
DOI:
10.1103/PhysRevLett.102.232001
PACS:
12.38.−t, 13.60.−r, 24.85.+p
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