Diffractive gauge bosons production beyond QCD factorisation

Abstract

We discuss single diffractive gauge bosons (${\gamma }^{\ast },W^{\pm },Z$) production in proton-proton collisions at different (LHC and RHIC) energies within the color dipole approach. The calculations are performed for gauge bosons produced at forward rapidities. The diffractive cross section is predicted as function of fractional momentum and invariant mass of the lepton pair. We found a dramatic breakdown of the diffractive QCD factorisation caused by an interplay of hard and soft interactions. Data from the CDF experiment on diffractive production of $W$ and $Z$ are well explained in a parameter free way.

28 pages, 10 figures; a clarification of absorptive corrections has been added, typos corrected; the published version

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• Hard hadronic diffraction is not hard
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• Central exclusive production of scalar and pseudoscalar charmonia in the light-front $k_T$-factorization approach
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• Drell-Yan process in $pA$ collisions: the exact treatment of coherence effects
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• Diffractive gauge boson production at the LHC as a probe of the flavour content of the Pomeron
• Breakdown of QCD factorization in hard diffraction