Improved measurement of double helicity asymmetry in inclusive midrapidity {pi}{sup 0} production for polarized p+p collisions at {radical}(s)=200 GeV

Journal Article · Mon May 01 04:00:00 EDT 2006 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.73.091102· OSTI ID:20782961

Adler, S S; Aronson, S H; Azmoun, B; David, G; Desmond, E J; Franz, A; Haggerty, J S; Harvey, M; Johnson, B M; Kistenev, E; Kroon, P J; Makdisi, Y I; Mioduszewski, S; Mitchell, J T; Morrison, D P; O'Brien, E; Pinkenburg, C; Pisani, R P; Purschke, M L; Shea, T K ^[1]

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1. Brookhaven National Laboratory, Upton, New York 11973-5000 (United States)

We present an improved measurement of the double helicity asymmetry for {pi}{sup 0} production in polarized proton-proton scattering at {radical}(s)=200 GeV employing the PHENIX detector at the Relativistic Heavy Ion Collider (RHIC). The improvements to our previous measurement come from two main factors: Inclusion of a new data set from the 2004 RHIC run with higher beam polarizations than the earlier run and a recalibration of the beam polarization measurements for the earlier run, which resulted in reduced uncertainties and increased beam polarizations. The results are compared to a Next to Leading Order (NLO) perturbative Quantum Chromodynamics (pQCD) calculation with a range of polarized gluon distributions.

• OSTI ID: 20782961
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 9 Vol. 73; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
BROOKHAVEN RHIC
DISTRIBUTION
GEV RANGE
GLUONS
HELICITY
INCLUSIVE INTERACTIONS
MULTIPARTICLE SPECTROMETERS
PARTICLE PRODUCTION
PARTICLE RAPIDITY
PERTURBATION THEORY
PIONS NEUTRAL
POLARIZATION
PROTON-PROTON INTERACTIONS
QUANTUM CHROMODYNAMICS