Inclusive Cross Section and Double Helicity Asymmetry for {pi}0 Production in p+p Collisions at s = 62.4 GeV

The PHENIX experiment presents results from the RHIC 2006 run with polarized p+p collisions at sqrt(s)=62.4 GeV, for inclusive {pi}{sup 0} production at midrapidity. Unpolarized cross section results are measured for transverse momenta p{sub T}=0.5 to 7 GeV/c. Next-to-leading order perturbative quantum chromodynamics calculations are compared with the data, and while the calculations are consistent with the measurements, next-to-leading logarithmic corrections improve the agreement. Double helicity asymmetries A{sub LL} are presented for p{sub T}=1 to 4 GeV/c and probe the higher range of Bjorken x of the gluon (x{sub g}) with better statistical precision than our previous measurements at sqrt(s)=200 GeV. These measurements are sensitive to the gluon polarization in the proton for 0.06

Keywords:

• Polarization (waves)
• Particle physics
• Perturbation theory (quantum mechanics)
• Gluon
• Physics
• Quantum chromodynamics
• Asymmetry
• Transverse plane
• Proton
• Helicity

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