Forward Neutral-Pion Transverse Single-Spin Asymmetries in p+p Collisions at {radical}(s)=200 GeV

Journal Article · Fri Nov 28 00:00:00 EST 2008 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.101.222001· OSTI ID:21179944

Abelev, B I; Barannikova, O; Betts, R R; Callner, J; Garcia-Solis, E; Hofman, D J; Hollis, R S; Iordanova, A; Suarez, M C ^[1]; Aggarwal, M M; Bhati, A K; Kumar, A; Pruthi, N K; Sharma, M ^[2]; Ahammed, Z; Chattopadhyay, S; Dutta Mazumdar, M R; Ganti, M S; Ghosh, P; Mohanty, B ^[3]

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1. University of Illinois at Chicago, Chicago, Illinois 60607 (United States)
2. Panjab University, Chandigarh 160014 (India)
3. Variable Energy Cyclotron Centre, Kolkata 700064 (India)

We report precision measurements of the Feynman x (x{sub F}) dependence, and first measurements of the transverse momentum (p{sub T}) dependence, of transverse single-spin asymmetries for the production of {pi}{sup 0} mesons from polarized proton collisions at {radical}(s)=200 GeV. The x{sub F} dependence of the results is in fair agreement with perturbative QCD model calculations that identify orbital motion of quarks and gluons within the proton as the origin of the spin effects. Results for the p{sub T} dependence at fixed x{sub F} are not consistent with these same perturbative QCD-based calculations.

• OSTI ID: 21179944
• Journal Information: Physical Review Letters, Vol. 101, Issue 22; Other Information: DOI: 10.1103/PhysRevLett.101.222001; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
COLLISIONS
GEV RANGE 100-1000
GLUONS
PIONS NEUTRAL
PROTON-PROTON INTERACTIONS
PROTONS
QUANTUM CHROMODYNAMICS
QUARKS
SPIN
TRANSVERSE MOMENTUM