Improved measurement of double helicity asymmetry in inclulsive midrapidity π0 production for polarized p + p collisions at √s = 200 GeV
PhysRevD_73_091102.pdf 136 KB
helicity (elementary particles)
proton-proton inclusive interactions
polarisation in elementary particle interactions
We present an improved measurement of the double helicity asymmetry for π0 production in polarized proton-proton scattering at √s=200GeV 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.
Physical Review D - Particles, Fields, Gravitation and Cosmology
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American Physical Society
Copyright (c) 2006 The American Physical Society.
Graduate School of Science