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arXiv · 2401.02781

Simultaneous Determination of Fragmentation Functions and Test on Momentum Sum Rule

Jun Gao·ChongYang Liu·XiaoMin Shen·Hongxi Xing·Yuxiang Zhao
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Abstract

We perform a simultaneous global analysis of hadron fragmentation functions (FFs) to various charged hadrons at next-to-leading order in QCD. The world data set includes results from electron-positron single-inclusive annihilation, semi-inclusive deep inelastic scattering, as well as proton-proton collisions including jet fragmentation measurements which lead to strong constraints on the gluon fragmentations. By carefully selecting hadron kinematics to ensure the validity of QCD factorization and the convergence of perturbative calculations, we achieve a satisfying best fit with $\chi^2/$d.o.f.$=0.90$, in the simultaneous extraction of FFs for light charged hadrons ($\pi^{\pm}$, $K^{\pm}$ and $p/\bar{p}$). The total momentum of $u$, $d$ quarks and gluon carried by light charged hadrons have been determined precisely. That urges future precision measurements on fragmentation to neutral hadrons, which are crucial for the test of fundamental sum rules in QCD fragmentation.

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Jun Gao, ChongYang Liu, XiaoMin Shen, Hongxi Xing, Yuxiang Zhao. 2024-01-05. Simultaneous Determination of Fragmentation Functions and Test on Momentum Sum Rule. https://doi.org/10.1103/physrevlett.132.261903

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