“School of Particles And Accelerator”
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| Paper IPM / Particles And Accelerator / 17876 |
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| Abstract: | |||||||
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This article introduces {\tt AAK24}, a Next-to-Leading Order (NLO) QCD analysis of polarized data from
both polarized Deep Inelastic Scattering (DIS) and Semi-Inclusive Deep Inelastic Scattering (SIDIS)
experiments on the nucleon. The {\tt AAK24} QCD analysis incorporates SU(2) and SU(3) symmetry breaking,
specifically $\delta \bar{u} \neq \delta \bar{d} \neq \delta \bar{s}$, 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 {\tt JLAB17}, {\tt COMPASS16},
and {\tt 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 nonperturbative target mass corrections (TMC) 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 {\tt AAK24} QCD
analysis show overall good agreement with the analyzed experimental data, aligning well with other
polarized PDF determinations, particularly {\tt DSSV14}, {\tt LSS10}, {\tt JAM17}, and {\tt AKS14},
all considering SU(2) and SU(3) symmetry breaking.
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