Simultaneous Monte Carlo analysis of parton densities and fragmentation functions

Abstract

We perform a comprehensive new Monte Carlo analysis of high-energy lepton-lepton, lepton-hadron and hadron-hadron scattering data to simultaneously determine parton distribution functions (PDFs) in the proton and parton to hadron fragmentation functions (FFs). The analysis includes all available semi-inclusive deep-inelastic scattering and single-inclusive $e^{+}{e}^{-}$ annihilation data for pions, kaons and unidentified charged hadrons, which allows the flavor dependence of the fragmentation functions to be constrained. Employing a new multi-step fitting strategy and more flexible parametrizations for both PDFs and FFs, we assess the impact of different data sets on sea quark densities, and confirm the previously observed suppression of the strange quark distribution. The new fit, which we refer to as "JAM20-SIDIS", will allow for improved studies of universality of parton correlation functions, including transverse momentum dependent (TMD) distributions, across a wide variety of process, and the matching of collinear to TMD factorization descriptions.

34 pages, 13 figures

References in corpus (8)

• Global Analysis of Fragmentation Functions for Protons and Charged Hadrons
• Determination of fragmentation functions and their uncertainties
• Origin of single transverse-spin asymmetries in high-energy collisions
• Fixed target Drell-Yan data and NNLO QCD fits of parton distribution functions
• First Monte Carlo analysis of fragmentation functions from single-inclusive $e^{+}{e}^{-}$ annihilation
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