Measurement of the Double Longitudinal Spin Asymmetry in Inclusive Jet Production in Polarized p-p Collisions at {radical}s = 200 GeV at STAR

Journal Article · Wed Jun 13 04:00:00 EDT 2007 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2750798· OSTI ID:21061916

Relyea, David ^[1]

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1. California Institute of Technology, 1200 E. California Blvd., Pasadena, CA 91125 (United States)

One of the primary goals of the STAR spin program at RHIC is the measurement of the double longitudinal asymmetry ALL in inclusive jet production. This measurement will allow STAR to determine the polarized gluon distribution function {delta}G in the Bjorken x region of 0.03<x<0.3. Inclusive jet production is a theoretically desirable way to measure {delta}G, as it is independent of fragmentation functions. This contribution presents STAR's preliminary 2005 measurements of ALL for inclusive jet production extracted from 3.1 pb-1 of data at {radical}s=200 GeV and 50% beam polarization. The asymmetry is calculated over the transverse momentum region 5 < pT < 30 GeV/c and compared with theoretical predictions incorporating several gluon polarization scenarios. Systematic uncertainties from false asymmetries, jet reconstruction, and triggering are discussed. At the present level of statistics, the measured asymmetry disfavors maximal gluon polarization but cannot yet distinguish between other theoretical scenarios.

• OSTI ID: 21061916
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 915; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
BARYONS
BROOKHAVEN RHIC
COLLIDING BEAMS
DISTRIBUTION FUNCTIONS
GEV RANGE
GLUONS
INCLUSIVE INTERACTIONS
JET MODEL
MULTIPARTICLE SPECTROMETERS
PARTICLE IDENTIFICATION
PARTICLE KINEMATICS
POLARIZATION
PROTON-PROTON INTERACTIONS
SPIN
STATISTICS
TRANSVERSE MOMENTUM