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Global analysis of the Sivers functions at NLO+NNLL in QCD

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arxiv 2009.10710 v2 pith:SAI3XESB submitted 2020-09-22 hep-ph hep-exnucl-exnucl-th

Miguel G. Echevarria , Zhong-Bo Kang , John Terry This is my paper · ORCID
classification hep-phhep-exnucl-exnucl-th
keywords dataasymmetryrhicsiversasymmetriesbosoncompassdrell-yan
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

We perform global fit to the quark Sivers function within the transverse momentum dependent (TMD) factorization formalism in QCD. We simultaneously fit Sivers asymmetry data from Semi-Inclusive Deep Inelastic Scattering (SIDIS) at COMPASS, HERMES, and JLab, from Drell-Yan lepton pair production at COMPASS, and from $W/Z$ boson at RHIC. This extraction is performed at next-to-leading order (NLO) and next-to-next-to leading logarithmic (NNLL) accuracy. We find excellent agreement between our extracted asymmetry and the experimental data for SIDIS and Drell-Yan lepton pair production, while tension arises when trying to describe the spin asymmetries of $W/Z$ bosons at RHIC. We carefully assess the situation, and we study in details the impact of the RHIC data and their implications through different ways of performing the fit. In addition, we find that the quality of the description of $W/Z$ vector boson asymmetry data could be strongly sensitive to the DGLAP evolution of Qiu-Sterman function, besides the usual TMD evolution. We present discussion on this and the implications for measurements of the transverse-spin asymmetries at the future Electron Ion Collider.

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Cited by 3 Pith papers

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

  1. Exploring nuclear modification using one-point energy correlator at the electron-ion collider

    hep-ph 2025-12 conditional novelty 6.0 of 10

    OPEC in e+A collisions factorizes in TMD QCD and predicts ~0.3–0.4 nuclear suppression at small angles, growing with angle, as a probe of cold-nuclear-matter broadening.

  2. Nucleon Tomography with 0-jettiness

    hep-ph 2025-06 conditional novelty 6.0 of 10

    Applying a 0-jettiness veto to transverse single-spin asymmetries in W/Z production at RHIC enhances the asymmetry signal, sharpening the test of the Sivers sign change.

  3. The 3D structure of the Nucleon in momentum space: TMD phenomenology

    hep-ph 2025-01 conditional novelty 2.0 of 10

    A review showing unpolarized quark TMD fits now reach collinear-PDF-like precision, while polarized and gluon TMDs remain less constrained.

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