Improved measurement of double helicity asymmetry in inclusive midrapidity {pi}{sup 0} production for polarized p+p collisions at {radical}(s)=200 GeV
- 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, Vol. 73, Issue 9; Other Information: DOI: 10.1103/PhysRevD.73.091102; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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