First results for the two-spin parameter ALL in π0 production by 200 GeV polarized protons and antiprotons

D. L. Adams, N. Akchurin, N. I. Belikov, J. Bystricky, P. Chaumette, M. D. Corcoran, J. D. Cossairt, J. Cranshaw, J. Deregel, A. A. Derevschikov, G. Durand, H. En'yo, J. Fabre, K. Fukuda, H. Funahashi, Y. Goto, O. A. Grachov, D. P. Grosnick, D. A. Hill, K. ImaiY. Itow, K. Iwatani, T. Kasprzyk, K. W. Krueger, K. Kuroda, M. Laghai, F. Lehar, A. de Lesquen, D. Lopiano, F. C. Luehring, T. Maki, S. Makino, A. Masaike, Yu A. Matulenko, A. P. Meschanin, A. Michalowicz, D. H. Miller, K. Miyake, T. Nagamine, F. Nessi-Tedaldi, M. Nessi, C. Nguyen, S. B. Nurushev, Y. Ohashi, Y. Onel, D. I. Patalakha, G. Pauletta, A. Penzo, A. L. Read, J. B. Roberts, L. van Rossum, V. L. Rykov, N. Saito, G. Salvato, P. Schiavon, J. Shepard, J. Skeens, V. L. Solovyanov, H. Spinka, R. Takashima, F. Takeutchi, N. Tamura, N. Tanaka, D. G. Underwood, A. N. Vasiliev, A. Villari, J. L. White, S. Yamashita, A. Yokosawa, T. Yoshida, A. Zanetti

研究成果: Article

39 被引用数 (Scopus)


The two-spin parameter ALL in inclusive π0 productionby longitudinally-polarized protons and antiprotons on a longitudinally-polarized proton target has been measured at the 200 GeV Fermilab spin physics facility, for π0's at xF=0 with 1≤pt≤3 GeV/c. The results exclude, at the 95% confidence level, values of ALL (pp) > 0.1 and < - 0.1 for π0's produced by protons, and values of ALL (pp) > 0.1 and < -0.2 for incident antiprotons. The relevance of ALL (pp) for the gluon spin density is discussed. The data are in good agreement with "conventional", small or zero, gluon polarization.

ジャーナルPhysics Letters B
出版ステータスPublished - 1991 5 23

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

フィンガープリント 「First results for the two-spin parameter A<sub>LL</sub> in π<sup>0</sup> production by 200 GeV polarized protons and antiprotons」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。