Inclusive cross section and double helicity asymmetry for {pi}{sup 0} production in p+p collisions at {radical}(s)=62.4 GeV
- University of Colorado, Boulder, Colorado 80309 (United States)
- Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region (Russian Federation)
- Department of Physics, University of Massachusetts, Amherst, Massachusetts 01003-9337 (United States)
- Chemistry Department, Stony Brook University, Stony Brook, SUNY, New York 11794-3400 (United States)
The PHENIX experiment presents results from the RHIC 2006 run with polarized p+p collisions at {radical}(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 {radical}(s)=200 GeV. These measurements are sensitive to the gluon polarization in the proton for 0.06<x{sub g}<0.4.
- OSTI ID:
- 21254668
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 79, Issue 1; Other Information: DOI: 10.1103/PhysRevD.79.012003; (c) 2009 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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