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Next-to-leading order forward hadron production in the small-$x$ regime: rapidity factorization

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arxiv 1403.5221 v1 pith:HZDT3UGG submitted 2014-03-20 hep-ph hep-exnucl-exnucl-th

classification hep-phhep-exnucl-exnucl-th
keywords rapidityfactorizationforwardregimesmall-calculationcrossdensity
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

Single inclusive hadron production at forward rapidity in high energy p+A collisions is an important probe of the high gluon density regime of QCD and the associated small-$x$ formalism. We revisit an earlier one-loop calculation to illustrate the significance of the "rapidity factorization" approach in this regime. Such factorization separates the very small-$x$ unintegrated gluon density evolution and leads to a new correction term to the physical cross section at one-loop level. Importantly, this rapidity factorization formalism remedies the previous unphysical negative next-to-leading order contribution to the cross section. It is much more stable with respect to "rapidity" variation when compared to the leading-order calculation and provides improved agreement between theory and experiment in the forward rapidity region.

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Forward citations

Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Forward parton-nucleus scattering at next-to-eikonal accuracy in the CGC

    hep-ph 2024-11 conditional novelty 7.0 of 10

    Full next-to-eikonal quark and gluon propagators in a dynamical gluon background are derived, and forward quark and gluon production cross sections are computed for quark-nucleus and gluon-nucleus scattering.

  2. Nuclear Cold QCD: Review and Future Strategy

    hep-ph 2025-06 unverdicted novelty 2.0 of 10

    Review summarizing observed cold nuclear matter modifications in hadron-nucleus collision data and proposing experimental strategies for the EIC to clarify underlying QCD mechanisms.

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