Analyzing power in inclusive π+ and π- production at high xF with a 200 GeV polarized proton beam

D. L. Adams, N. Akchurin, N. I. Belikov, B. E. Bonner, J. A. Buchanan, J. Bystricky, J. M. Clement, M. D. Corcoran, J. D. Cossairt, J. Cranshaw, A. A. Derevschikov, H. En'yo, H. Funahashi, Y. Goto, O. A. Grachov, D. P. Grosnick, D. A. Hill, K. Imai, Y. Itow, K. IwataniK. W. Krueger, K. Kuroda, J. Langland, 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, G. C. Phillips, A. L. Read, J. B. Roberts, L. van Rossum, V. L. Rykov, N. Saito, G. Salvato, P. Schiavon, J. Skeens, V. L. Solovyanov, H. Spinka, R. W. Stanek, 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

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The analyzing power in inclusive charged pion production has been measured using the 200 GeV Fermilab polarized proton beam. A striking dependence in xF is observed in which AN increases from 0 to 0.42 with increasing xF for the π+ data and decreases from 0 to -0.38 with increasing xF for π- data. The kinematic range covered is 0.2≤xF≤0.9 and 0.2≤pT≤2.0 GeV/c. In a simple model our data indicate that at large xF the transverse spin of the proton is correlated with that of its quark constituents.

Original languageEnglish
Pages (from-to)462-466
Number of pages5
JournalPhysics Letters B
Issue number3-4
StatePublished - Aug 1 1991


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