Single-spin asymmetries and invariant cross sections of the high transverse-momentum inclusive {pi}{sup 0} production in 200 GeV/{ital c} {ital pp} and {ital {bar p}p} interactions

Journal Article · Wed May 01 04:00:00 EDT 1996 · Physical Review, D

OSTI ID:284039

The {pi}{sup 0} inclusive and semi-inclusive, single-spin asymmetries have been measured using transversely polarized, 200-GeV/{ital c} proton and antiproton beams colliding with an unpolarized hydrogen target. The measured asymmetries are consistent with zero within the experimental uncertainties for the kinematic region {minus}0.15{lt}{ital x}{sub {ital F}}{lt}+0.15 and 1{lt}{ital p}{sub {ital T}}{lt}4.5 GeV/{ital c}. Improvements in the data analysis showed that our earlier large asymmetries at {ital p}{sub {ital T}}{approx_gt}3GeV/{ital c} were not correct. These data indicate that PQCD expectations seem confirmed and the higher-twist contribution to the single-spin asymmetry in {pi}{sup 0} production at {ital x}{sub {ital F}}=0 is not large. Additional evidence for such a conclusion comes from the measurement of a semi-inclusive {pi}{sup 0} asymmetry, where associated charged particles are detected opposite to the {pi}{sup 0} azimuthal direction. This experiment also provides high-statistics data on the inclusive {pi}{sup 0} cross sections for {ital pp} and {bar {ital p}}{ital p} collisions at {radical}{ital s}{approx_equal}19.4 GeV. {copyright} {ital 1996 The American Physical Society.}

• Research Organization: Fermi National Accelerator Laboratory
• DOE Contract Number: AC02-76CH03000; AC02-76ER02289; AS05-76ER05096; W-31109-ENG-38; W-7405-ENG-36
• OSTI ID: 284039
• Journal Information: Physical Review, D, Journal Name: Physical Review, D Journal Issue: 9 Vol. 53; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ANTIPROTON BEAMS
ASYMMETRY
CHARGED PARTICLES
CROSS SECTIONS
HYDROGEN 1 TARGET
INCLUSIVE INTERACTIONS
PIONS NEUTRAL
POLARIZED BEAMS
PROTON BEAMS
SPIN