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We present an improved measurement of the double helicity asymmetry for pi^0production in polarized proton-proton scattering at sqrt(s) = 200 GeV employingthe PHENIX detector at the Relativistic Heavy Ion Collider (RHIC). Theimprovements to our previous measurement come from two main factors: Inclusionof a new data set from the 2004 RHIC run with higher beam polarizations thanthe earlier run and a recalibration of the beam polarization measurements,which resulted in reduced uncertainties and increased beam polarizations. Theresults are compared to a Next to Leading Order (NLO) perturbative QuantumChromodynamics (pQCD) calculation with a range of polarized gluondistributions.

physical review. d. particles, fields, gravitation, and cosmology/physical review. d, particles, fields, gravitation, and cosmology

Improved measurement of double helicity asymmetry in inclulsive midrapidity<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>π</mml:mi><mml:mn>0</mml:mn></mml:msup></mml:math>production for polarized<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi><mml:mo>+</mml:mo><mml:mi>p</mml:mi></mml:math>collisions at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msqrt><mml:mi>s</mml:mi></…

Improved measurement of double helicity asymmetry in inclulsive midrapidityπ0production for polarizedp+pcollisions ats