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

Journal Article · Sun Apr 01 00:00:00 EDT 2007 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.75.074027· OSTI ID:21020287

Leader, Elliot; Sidorov, Aleksander V; Stamenov, Dimiter B ^[1]

---

1. Imperial College, Prince Consort Road, London SW7 2BW (United Kingdom)

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.

• OSTI ID: 21020287
• Journal Information: Physical Review. D, Particles Fields, Vol. 75, Issue 7; Other Information: DOI: 10.1103/PhysRevD.75.074027; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

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