Forward neutral pion production in p+p and d+Au collisions at {radical}{ovr s}{sub NN} = 200 GeV

Measurements of the production of forward {pi}{sup 0} mesons from p+p and d+Au collisions at {radical}s{sub NN} = 200 GeV are reported. The p+p yield generally agrees with next-to-leading order perturbative QCD calculations. The d+Au yield per binary collision is suppressed as {eta} increases, decre...

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Bibliographic Details
Published in:Physical review letters 2006-01, Vol.97 (2006)
Main Authors: Cadman, R. V., Krueger, K., McClain, C.J., Spinka, H. M., Underwood, D. G., Adams , J., Aggrawal, M. M., Ahammed, Z., Amonett, J., Anderson, B. D., Univ. of Birmingham, Panjab Univ, Variable Energy Cyclotron Centre, Kent State Univ
Format: Article
Language:English
Subjects:
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
GLUONS
HADRONS
HEAVY NUCLEI
MESONS
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
PIONS
PRODUCTION
QUANTUM CHROMODYNAMICS
SATURATION
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Summary:Measurements of the production of forward {pi}{sup 0} mesons from p+p and d+Au collisions at {radical}s{sub NN} = 200 GeV are reported. The p+p yield generally agrees with next-to-leading order perturbative QCD calculations. The d+Au yield per binary collision is suppressed as {eta} increases, decreasing to {approx}30% of the p+p yield at = 4.00, well below shadowing expectations. Exploratory measurements of azimuthal correlations of the forward {pi}{sup 0} with charged hadrons at {eta} {approx} 0 show a recoil peak in p+p that is suppressed in d+Au at low pion energy. These observations are qualitatively consistent with a saturation picture of the low-x gluon structure of heavy nuclei.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.97.152302