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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; Nessia, M; Nguyen, C; ... Yoshida, T; + view all (1991) First results for the two-spin parameter A in π production by 200 GeV polarized protons and antiprotons. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics , 261 (1-2) 197 - 200.

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Abstract

The two-spin parameter A in inclusive π production by 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(p̄p) > 0.1 and < -0.2 for incident antiprotons. The relevance of A(p̄p) for the gluon spin density is discussed. The data are in good agreement with "conventional", small or zero, gluon polarization.

Type:Article
Title:First results for the two-spin parameter A in π production by 200 GeV polarized protons and antiprotons
UCL classification:UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Physics and Astronomy

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