First NNLO fragmentation functions of KS0 and Λ/Λ¯ and their uncertainties in

Abstract

The current paper presents a determination of K 0 S and Λ/ Λ fragmentation functions (FFs) from QCD analysis of single-inclusive electron-positron annihilation process (SIA). Our FFs determinations are performed at next-to-leading order (NLO), and for the first time, at next-to-next-to-leading order (NNLO) accuracy in perturbative Quantum Chromodynamics (pQCD) which is designated as SAK20 FFs. Each of these FFs is accompanied by their uncertainties which are determined using the 'Hessian' method. Considering the hadron mass corrections, we clearly investigate the reliability of our results upon the inclusion of higher-order QCD correction. We provide comparisons of SAK20 FFs set with the available analysis from another group, finding in general a reasonable agreement, and also considerable differences. In order to judge the fit quality, our theoretical predictions are compared with the analyzed SIA datasets. SAK20 FFs at NLO and NNLO accuracy along with their uncertainties are made available in the standard LHAPDF format in order to use for predictions of present and future measurements in high-energy collisions such as LHC and RHIC.

Neural Network QCD analysis of charged hadron Fragmentation Functions in the presence of SIDIS data

“…Several theoretical analyses have been exploited on SIA, SIDIS and pp collisions data sets in QCD analysis to constrain the FFs of identified light charged hadrons [23][24][25][26][27][28], unidentified light charged hadron [25,29,30] and heavy hadrons [31][32][33].…”