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First results for the two-spin parameter A<inf>LL</inf> in π<sup>0</sup> production by 200 GeV polarized protons and antiprotons

Adams, DL; Akchurin, N; Belikov, NI; Bystricky, J; Chaumette, P; Corcoran, MD; Cossairt, JD; ... Zanetti, A; + view all (1991) First results for the two-spin parameter A<inf>LL</inf> in π<sup>0</sup> production by 200 GeV polarized protons and antiprotons. Physics Letters B , 261 (1-2) pp. 197-200. 10.1016/0370-2693(91)91350-5.

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Abstract

The two-spin parameter A LL in inclusive π 0 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 0 's at x F =0 with 1≤p t ≤3 GeV/c. The results exclude, at the 95% confidence level, values of A LL (pp) > 0.1 and < - 0.1 for π 0 's produced by protons, and values of A LL (pp) > 0.1 and < -0.2 for incident antiprotons. The relevance of A LL (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<inf>LL</inf> in π<sup>0</sup> production by 200 GeV polarized protons and antiprotons
DOI: 10.1016/0370-2693(91)91350-5
UCL classification: UCL > School of BEAMS
UCL > School of BEAMS > Faculty of Maths and Physical Sciences
URI: http://discovery.ucl.ac.uk/id/eprint/1338207
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