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Title: Global analysis of fragmentation functions for pions and kaons and their uncertainties

Abstract

We present new sets of pion and kaon fragmentation functions obtained in next-to-leading order combined analyses of single-inclusive hadron production in electron-positron annihilation, proton-proton collisions, and deep-inelastic lepton-proton scattering with either pions or kaons identified in the final state. At variance with all previous fits, the present analyses take into account data where hadrons of different electrical charge are identified, which allow one to discriminate quark from antiquark fragmentation functions without the need of nontrivial flavor symmetry assumptions. The resulting sets are in good agreement with all data analyzed, which cover a much wider kinematical range than in previous fits. An extensive use of the Lagrange multiplier technique is made in order to assess the uncertainties in the extraction of the fragmentation functions and the synergy from the complementary data sets in our global analysis.

Authors:
; ;  [1];  [2]
  1. Departamento de Fisica, Universidad de Buenos Aires, Ciudad Universitaria, Pabellon 1 (1428) Buenos Aires (Argentina)
  2. (Japan)
Publication Date:
OSTI Identifier:
20929549
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles Fields; Journal Volume: 75; Journal Issue: 11; Other Information: DOI: 10.1103/PhysRevD.75.114010; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; DEEP INELASTIC SCATTERING; ELECTRON-POSITRON INTERACTIONS; FLAVOR MODEL; FRAGMENTATION; GLOBAL ANALYSIS; KAONS; LEPTON-PROTON INTERACTIONS; PARTICLE PRODUCTION; PIONS; PROTON-PROTON INTERACTIONS; QUARKS

Citation Formats

Florian, Daniel de, Sassot, Rodolfo, Stratmann, Marco, and Radiation Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198. Global analysis of fragmentation functions for pions and kaons and their uncertainties. United States: N. p., 2007. Web. doi:10.1103/PHYSREVD.75.114010.
Florian, Daniel de, Sassot, Rodolfo, Stratmann, Marco, & Radiation Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198. Global analysis of fragmentation functions for pions and kaons and their uncertainties. United States. doi:10.1103/PHYSREVD.75.114010.
Florian, Daniel de, Sassot, Rodolfo, Stratmann, Marco, and Radiation Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198. Fri . "Global analysis of fragmentation functions for pions and kaons and their uncertainties". United States. doi:10.1103/PHYSREVD.75.114010.
@article{osti_20929549,
title = {Global analysis of fragmentation functions for pions and kaons and their uncertainties},
author = {Florian, Daniel de and Sassot, Rodolfo and Stratmann, Marco and Radiation Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198},
abstractNote = {We present new sets of pion and kaon fragmentation functions obtained in next-to-leading order combined analyses of single-inclusive hadron production in electron-positron annihilation, proton-proton collisions, and deep-inelastic lepton-proton scattering with either pions or kaons identified in the final state. At variance with all previous fits, the present analyses take into account data where hadrons of different electrical charge are identified, which allow one to discriminate quark from antiquark fragmentation functions without the need of nontrivial flavor symmetry assumptions. The resulting sets are in good agreement with all data analyzed, which cover a much wider kinematical range than in previous fits. An extensive use of the Lagrange multiplier technique is made in order to assess the uncertainties in the extraction of the fragmentation functions and the synergy from the complementary data sets in our global analysis.},
doi = {10.1103/PHYSREVD.75.114010},
journal = {Physical Review. D, Particles Fields},
number = 11,
volume = 75,
place = {United States},
year = {Fri Jun 01 00:00:00 EDT 2007},
month = {Fri Jun 01 00:00:00 EDT 2007}
}
  • We describe the quark fragmentation functions to pions and kaons in the NJL-jet model and compare the results with empirical parametrizations. By including cascade-like fragmentation processes, the momentum and isospin sum rules can be satisfied naturally without introducing new parameters into the theory. We associate a low energy scale with the NJL model, and perform the Q{sup 2} evolution in leading order. The results are in reasonable agreement with the empirical fragmentation functions.
  • We present new sets of fragmentation functions for protons and inclusive charged hadrons obtained in combined next-to-leading order QCD analyses of single-inclusive hadron production in electron-positron annihilation, proton-proton collisions, and deep-inelastic lepton-proton scattering. These analyses complement previous results for pion and kaon fragmentation functions with charge and flavor discrimination. The Lagrange multiplier technique is used to assess the uncertainties in the extraction of the new sets of fragmentation functions.
  • Fragmentation functions (FFs) which are beyond the perturbative description give information on parton fragmentation processes. The fragmentation functions can be extracted from the world data of e+e- hadron production in the framework of perturbative QCD. FFs become important elements in analyses of high energy interactions with hadron production, like Semi-Inclusive Deep Inelastic Scattering (SIDIS). However, the errors of FFs had not been estimated. By performing pQCD fit to e+e- experimental data, we estimated the errors of FFs, especially focusing on widely used Kretzer fragmentation functions. By applying those results, we also investigated the effects of the errors of FFs onmore » the analysis of SIDIS process.« less
  • A new Quantum Chromodynamics (QCD) analysis framework of fragmentation and parton distribution functions has been developed by the TTAP (Team Towards global Analysis of the Proton and partons) collaboration. The Mellin transformation technique used in the analysis framework improved the computing speed, which allows us to perform further detailed analysis.
  • We present an update of a previous global analysis of the experimental data on azimuthal asymmetries in semi-inclusive deep inelastic scattering (SIDIS), from the HERMES and COMPASS Collaborations, and in e{sup +}e{sup -}{yields}h{sub 1}h{sub 2}X processes, from the Belle Collaboration. Compared to the first extraction, a more precise determination of the Collins fragmentation function and the transversity distribution function for u and d quarks is obtained.