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First results for the two-spin parameter A in π production by 200 GeV polarized protons and antiprotons

Adams, DL; Corcoran, MD; Cranshaw, J; Nessi-Tedaldi, F; Nessi, M; Nguyen, C; Roberts, JB; (1991) First results for the two-spin parameter A in π production by 200 GeV polarized protons and antiprotons. Physics Letters B , 261 (1-2) 197 - 200. 10.1016/0370-2693(91)91350-5.

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Abstract

The two-spin parameter A in inclusive π productionby longitudinally-polarized protons and antiprotons on a longitudinally-polarized proton target has been measured at the 200 GeV Fermilab spin physics facility, for π's at x=0 with 1≤p≤3 GeV/c. The results exclude, at the 95% confidence level, values of A (pp) > 0.1 and < - 0.1 for π's produced by protons, and values of A (pp) > 0.1 and < -0.2 for incident antiprotons. The relevance of A (pp) for the gluon spin density is discussed. The data are in good agreement with "conventional", small or zero, gluon polarization. © 1991.

Type: Article
Title: First results for the two-spin parameter A in π production by 200 GeV polarized protons and antiprotons
DOI: 10.1016/0370-2693(91)91350-5
UCL classification: UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Physics and Astronomy
URI: http://discovery.ucl.ac.uk/id/eprint/1338207
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