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AAK24: Global QCD analysis on polarized parton distribution in the presence of \(A_2\) asymmetry measurements

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Abstract

This article introduces AAK24, a Next-to-Leading Order QCD analysis of polarized data from both polarized Deep Inelastic Scattering (DIS) and Semi-Inclusive Deep Inelastic Scattering (SIDIS) experiments on the nucleon. The AAK24 QCD analysis incorporates SU(2) and SU(3) symmetry breaking, specifically \(\delta \bar{u} \ne \delta \bar{d} \ne \delta \bar{s}\), while assuming \(\delta \bar{s}\) and \(\delta s\) are equal. Emphasizing the significance of the semi-inclusive data, the study explores the determination of polarized sea-quark distributions. Recent experimental data from JLAB17, COMPASS16, and COMPASS17, including the \(A_2\) asymmetry measurements along with SIDIS observables, are thoroughly examined for their impact on the central values of polarized PDFs, their uncertainties, and overall fit quality. Additionally, we include the non-perturbative target mass corrections as well as higher-twist terms (HT) which are particularly important. In this work, the uncertainties are quantified using the standard Hessian method. The main results and findings of the AAK24 QCD analysis show overall good agreement with the analyzed experimental data, aligning well with other polarized PDF determinations, particularly DSSV14, LSS10, JAM17, and AKS14, all considering SU(2) and SU(3) symmetry breaking.

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Data Availability Statement

This manuscript has associated data in a data in a repository. [Authors comment: This data sets generated during the current study are available from the corresponding author on responsible request.]

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Acknowledgements

The authors appreciate the financial support from the Iran National Science Foundation (INSF) under grant number 4013570. S. A. T. and H. K. are also grateful to the School of Particles and Accelerators, Institute for Research in Fundamental Sciences (IPM). F. A. acknowledges the Farhangian University for the provided support to conduct this research. H. Khanpour appreciates the financial support from NAWA under grant number BPN/ULM/2023/1/00160 and from the IDUB program at the AGH University. We also thank Dimiter Stamenov for providing the necessary LSS10 grids and Rodolfo Sassot for supplying the required DSSV14 grids data.

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Authors and Affiliations

  1. Department of Physics Education, Farhangian University, P.O.Box 14665-889, Tehran, Iran

    Fatemeh Arbabifar

  2. School of Particles and Accelerators, Institute for Research in Fundamental Sciences (IPM), P.O.Box 19395-5531, Tehran, Iran

    Shahin Atashbar Tehrani & Hamzeh Khanpour

  3. Department of Physics, Faculty of Nano and Bio Science and Technology, Persian Gulf University, Bushehr, 75169, Iran

    Shahin Atashbar Tehrani

  4. AGH University, Faculty of Physics and Applied Computer Science, Al. Mickiewicza 30, 30-055, Kraków, Poland

    Hamzeh Khanpour

  5. Department of Physics, University of Science and Technology of Mazandaran, P.O.Box 48518-78195, Behshahr, Iran

    Hamzeh Khanpour

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  1. Fatemeh Arbabifar
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Correspondence to Hamzeh Khanpour.

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Arbabifar, F., Tehrani, S.A. & Khanpour, H. AAK24: Global QCD analysis on polarized parton distribution in the presence of \(A_2\) asymmetry measurements. Eur. Phys. J. Plus 139, 834 (2024). https://doi.org/10.1140/epjp/s13360-024-05601-5

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