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Paper   IPM / Particles / 17752
School of Particles and Accelerator
  Title:   Determination of $K^0_S$ Fragmentation Functions including {\tt BESIII} Measurements and using Neural Networks
  Author(s): 
1.  Maryam Soleymaninia
2.  Hadi Hashamipour
3.  Maral Salajegheh
4.  Hamzeh Khanpour
5.  Hubert Spiesberger
6.  Ulf-G Meissner
  Status:   Published
  Journal: Phys. Rev. D
  Vol.:  110
  Year:  2024
  Supported by:  IPM
  Abstract:
In this study, we revisit the extraction of parton-to-$K^0_S$ hadron fragmentation functions, named \texttt{FF24-}$K^0_S$, focusing on both next-to-leading-order and next-to-next-to-leading-order accuracy in perturbative QCD. Our approach involves the analysis of single inclusive electron-positron annihilation (SIA) data. The two key improvements are, on the one hand, the incorporation of the latest experimental data from the {\tt BESIII} experiment and, on the other hand, the adoption of Neural Networks in the fitting procedure. To address experimental uncertainties, the Monte Carlo method is employed. Our investigation also explores the impact of hadron mass corrections on the description of SIA data, spanning a broad kinematic regime with a particular emphasis on the range of small $z$ values. The theory prediction for $K^0_S$ production at both NLO and NNLO accuracy exhibits good agreement with experimental data within their respective uncertainties.

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