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Higgs production at RHIC and the positivity of the gluon helicity distribution

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arxiv 2401.10814 v2 pith:JESMGT67 submitted 2024-01-19 hep-ph

Daniel de Florian , Stefano Forte , Werner Vogelsang This is my paper · ORCID
classification hep-ph
keywords gluonnegativedeltadistributioncross-sectionshelicityhiggsphysical
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

We show that the negative polarized gluon distribution $\Delta g$ found in a recent global next-to-leading order QCD analysis of the nucleon helicity structure is incompatible with the fundamental requirement that physical cross-sections must not be negative. Specifically, we show that the fact that this polarized gluon strongly violates the positivity condition $|\Delta g|\leq g$ in terms of the unpolarized gluon distribution $g$ leads to negative cross-sections for Higgs boson production at RHIC as a physical process, implying that this negative $\Delta g$ is unphysical.

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Cited by 4 Pith papers

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

  1. Precision measurement of the longitudinal double-spin asymmetry for dijet production at intermediate pseudorapidity in polarized $pp$ collisions at $\sqrt{s}$ = 200 GeV

    hep-ex 2024-11 conditional novelty 5.0 of 10

    New STAR double-spin asymmetry data for dijets at intermediate pseudorapidity favor positive gluon polarization and disfavor the JAM22 negative solution by 3.5 sigma.

  2. NNLO Determination of Polarized Parton Distribution Functions with Higher-Twist and Target-Mass Corrections

    hep-ph 2026-07 accept novelty 4.0 of 10

    KLS26 is an NNLO polarized PDF set from inclusive DIS that includes TMC, additive and multiplicative higher-twist terms, and positivity, with the largest NNLO shifts in the strange-quark helicity distribution.

  3. Global analyses of helicity-dependent parton distribution functions

    hep-ph 2026-07 accept novelty 2.0 of 10

    Modern global QCD analyses agree that up-quark helicity is positive and down-quark helicity negative, with positive gluon polarisation at moderate x, while the full gluon spin moment remains limited by the unmeasured ...

  4. Spin Structure of the Nucleon: Overview

    hep-ph 2026-07 unverdicted

    A pedagogical review consolidates the proton spin decomposition into quark/gluon spin and orbital angular momentum, emphasizing gauge-invariant OAM definitions, small-x cancellations, and EIC observables.

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