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

Journal Article · Thu Jan 01 04:00:00 EST 2009 · Physical Review D

DOI:https://doi.org/10.1103/PhysRevD.79.012003· OSTI ID:946767

Adare, A. ^[1]; Awes, Terry C ^[2]; Cianciolo, Vince ^[2]; Enokizono, Akitomo ^[3]; Read, Jr, Kenneth F ^[2]; Silvermyr, David O ^[2]; Sorensen, Soren P ^[4]; Stankus, Paul W ^[2]; Young, Glenn R ^[2]

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1. University of Colorado, Boulder
2. ORNL
3. Lawrence Livermore National Laboratory (LLNL)
4. University of Tennessee, Knoxville (UTK)

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<x{sub g}<0.4.

• Research Organization: Oak Ridge National Laboratory (ORNL)
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 946767
• Journal Information: Physical Review D, Journal Name: Physical Review D Journal Issue: 1 Vol. 79
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCURACY
ASYMMETRY
CROSS SECTIONS
GLUONS
HELICITY
POLARIZATION
PROBES
PRODUCTION
PROTONS
QUANTUM CHROMODYNAMICS