Nonlinear QCD meets data: A global analysis of leptonproton scattering with running coupling BalitskyKovchegov evolution
Abstract
We perform a global fit to the structure function F{sub 2} measured in leptonproton experiments at small values of Bjorkenx, x{<=}0.01, for all experimentally available values of Q{sup 2}, 0.045 GeV{sup 2}{<=}Q{sup 2}{<=}800 GeV{sup 2}. We show that the recent improvements resulting from the inclusion of running coupling corrections allow for a description of data in terms of nonlinear QCD evolution equations. In this approach F{sub 2} is calculated within the dipole model with all Bjorkenx dependence described by the running coupling BalitskyKovchegov equation. Two different initial conditions for the evolution are used, both yielding good fits to data with {chi}{sup 2}/d.o.f.<1.1. The proton longitudinal structure function F{sub L}, not included in the fits, is also well described. Our analysis allows to perform a first principle extrapolation of the protondipole scattering amplitude once the initial condition has been fitted to presently available data. We provide predictions for F{sub 2} and F{sub L} in the kinematical regions of interest for future colliders and ultrahigh energy cosmic rays. A numerical implementation of our results down to x=10{sup 12} is released as a computer code for public use.
 Authors:

 European Center for Theoretical Studies in Nuclear Physics and Related Areas (ECT), Strada delle Tabarelle 286, I38050 Villazzano (Italy)
 Departamento de Fisica de Particulas and IGFAE, Universidade de Santiago de Compostela, E15706 Santiago de Compostela (Spain)
 CENTRA, Instituto Superior Tecnico (IST), Avenida Rovisco Pais, P1049001 Lisboa (Portugal)
 Publication Date:
 OSTI Identifier:
 21322360
 Resource Type:
 Journal Article
 Journal Name:
 Physical Review. D, Particles Fields
 Additional Journal Information:
 Journal Volume: 80; Journal Issue: 3; Other Information: DOI: 10.1103/PhysRevD.80.034031; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 05562821
 Country of Publication:
 United States
 Language:
 English
 Subject:
 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; COMPUTERIZED SIMULATION; CORRECTIONS; COSMIC RADIATION; COUPLING; DIPOLES; EQUATIONS; EXTRAPOLATION; FORECASTING; GLOBAL ANALYSIS; LEPTONPROTON INTERACTIONS; LEPTONS; NONLINEAR PROBLEMS; PROTONS; QUANTUM CHROMODYNAMICS; SCATTERING AMPLITUDES; STRUCTURE FUNCTIONS
Citation Formats
Albacete, Javier L, Armesto, Nestor, Salgado, Carlos A, and Milhano, Jose Guilherme. Nonlinear QCD meets data: A global analysis of leptonproton scattering with running coupling BalitskyKovchegov evolution. United States: N. p., 2009.
Web. doi:10.1103/PHYSREVD.80.034031.
Albacete, Javier L, Armesto, Nestor, Salgado, Carlos A, & Milhano, Jose Guilherme. Nonlinear QCD meets data: A global analysis of leptonproton scattering with running coupling BalitskyKovchegov evolution. United States. doi:10.1103/PHYSREVD.80.034031.
Albacete, Javier L, Armesto, Nestor, Salgado, Carlos A, and Milhano, Jose Guilherme. Sat .
"Nonlinear QCD meets data: A global analysis of leptonproton scattering with running coupling BalitskyKovchegov evolution". United States. doi:10.1103/PHYSREVD.80.034031.
@article{osti_21322360,
title = {Nonlinear QCD meets data: A global analysis of leptonproton scattering with running coupling BalitskyKovchegov evolution},
author = {Albacete, Javier L and Armesto, Nestor and Salgado, Carlos A and Milhano, Jose Guilherme},
abstractNote = {We perform a global fit to the structure function F{sub 2} measured in leptonproton experiments at small values of Bjorkenx, x{<=}0.01, for all experimentally available values of Q{sup 2}, 0.045 GeV{sup 2}{<=}Q{sup 2}{<=}800 GeV{sup 2}. We show that the recent improvements resulting from the inclusion of running coupling corrections allow for a description of data in terms of nonlinear QCD evolution equations. In this approach F{sub 2} is calculated within the dipole model with all Bjorkenx dependence described by the running coupling BalitskyKovchegov equation. Two different initial conditions for the evolution are used, both yielding good fits to data with {chi}{sup 2}/d.o.f.<1.1. The proton longitudinal structure function F{sub L}, not included in the fits, is also well described. Our analysis allows to perform a first principle extrapolation of the protondipole scattering amplitude once the initial condition has been fitted to presently available data. We provide predictions for F{sub 2} and F{sub L} in the kinematical regions of interest for future colliders and ultrahigh energy cosmic rays. A numerical implementation of our results down to x=10{sup 12} is released as a computer code for public use.},
doi = {10.1103/PHYSREVD.80.034031},
journal = {Physical Review. D, Particles Fields},
issn = {05562821},
number = 3,
volume = 80,
place = {United States},
year = {2009},
month = {8}
}