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Title: Impact of CLAS and COMPASS data on polarized parton densities and higher twist

Abstract

We have reanalyzed the world data on inclusive polarized deep inelastic scattering (DIS) including the very precise CLAS proton and deuteron data, as well as the latest COMPASS data on the asymmetry A{sub 1}{sup d}, and have studied the impact of these data on polarized parton densities and higher twist effects. We demonstrate that the low Q{sup 2} CLAS data improve essentially our knowledge of higher twist corrections to the spin structure function g{sub 1}, while the large Q{sup 2} COMPASS data influence mainly the strange quark density. In our new analysis we find that a negative polarized gluon density, or one that changes sign as a function of x, cannot be ruled out on the basis of the present DIS data.

Authors:
; ;  [1];  [2];  [3]
  1. Imperial College, Prince Consort Road, London SW7 2BW (United Kingdom)
  2. (Russian Federation)
  3. (Bulgaria)
Publication Date:
OSTI Identifier:
21020287
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles Fields; Journal Volume: 75; Journal Issue: 7; Other Information: DOI: 10.1103/PhysRevD.75.074027; (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; ASYMMETRY; CORRECTIONS; DEEP INELASTIC SCATTERING; DENSITY; DEUTERIUM TARGET; FOUR MOMENTUM TRANSFER; GLUONS; HYDROGEN 1 TARGET; MULTIPARTICLE SPECTROMETERS; PARTICLE IDENTIFICATION; PROTONS; S QUARKS; SPIN; STRUCTURE FUNCTIONS

Citation Formats

Leader, Elliot, Sidorov, Aleksander V., Stamenov, Dimiter B., Bogoliubov Theoretical Laboratory Joint Institute for Nuclear Research, 141980 Dubna,, and Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, Boulevard, Tsarigradsko Chaussee 72, Sofia 1784. Impact of CLAS and COMPASS data on polarized parton densities and higher twist. United States: N. p., 2007. Web. doi:10.1103/PHYSREVD.75.074027.
Leader, Elliot, Sidorov, Aleksander V., Stamenov, Dimiter B., Bogoliubov Theoretical Laboratory Joint Institute for Nuclear Research, 141980 Dubna,, & Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, Boulevard, Tsarigradsko Chaussee 72, Sofia 1784. Impact of CLAS and COMPASS data on polarized parton densities and higher twist. United States. doi:10.1103/PHYSREVD.75.074027.
Leader, Elliot, Sidorov, Aleksander V., Stamenov, Dimiter B., Bogoliubov Theoretical Laboratory Joint Institute for Nuclear Research, 141980 Dubna,, and Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, Boulevard, Tsarigradsko Chaussee 72, Sofia 1784. Sun . "Impact of CLAS and COMPASS data on polarized parton densities and higher twist". United States. doi:10.1103/PHYSREVD.75.074027.
@article{osti_21020287,
title = {Impact of CLAS and COMPASS data on polarized parton densities and higher twist},
author = {Leader, Elliot and Sidorov, Aleksander V. and Stamenov, Dimiter B. and Bogoliubov Theoretical Laboratory Joint Institute for Nuclear Research, 141980 Dubna, and Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, Boulevard, Tsarigradsko Chaussee 72, Sofia 1784},
abstractNote = {We have reanalyzed the world data on inclusive polarized deep inelastic scattering (DIS) including the very precise CLAS proton and deuteron data, as well as the latest COMPASS data on the asymmetry A{sub 1}{sup d}, and have studied the impact of these data on polarized parton densities and higher twist effects. We demonstrate that the low Q{sup 2} CLAS data improve essentially our knowledge of higher twist corrections to the spin structure function g{sub 1}, while the large Q{sup 2} COMPASS data influence mainly the strange quark density. In our new analysis we find that a negative polarized gluon density, or one that changes sign as a function of x, cannot be ruled out on the basis of the present DIS data.},
doi = {10.1103/PHYSREVD.75.074027},
journal = {Physical Review. D, Particles Fields},
number = 7,
volume = 75,
place = {United States},
year = {Sun Apr 01 00:00:00 EDT 2007},
month = {Sun Apr 01 00:00:00 EDT 2007}
}