First results for the two-spin parameter ALL in 0 production by 200 GeV polarized protons and antiprotons Academic Article uri icon


  • The two-spin parameter ALL in inclusive 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 0's at xF=0 with 1pt3 GeV/c. The results exclude, at the 95% confidence level, values of ALL (pp) > 0.1 and < - 0.1 for 0'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. 1991.

published proceedings

  • Physics Letters B

author list (cited authors)

  • Adams, D. L., Akchurin, N., Belikov, N. I., Bystricky, J., Chaumette, P., Corcoran, M. D., ... Zanetti, A.

citation count

  • 36

complete list of authors

  • Adams, DL||Akchurin, N||Belikov, NI||Bystricky, J||Chaumette, P||Corcoran, MD||Cossairt, JD||Cranshaw, J||Deregel, J||Derevschikov, AA||Durand, G||En'yo, H||Fabre, J||Fukuda, K||Funahashi, H||Goto, Y||Grachov, OA||Grosnick, DP||Hill, DA||Imai, K||Itow, Y||Iwatani, K||Kasprzyk, T||Krueger, KW||Kuroda, K||Laghai, M||Lehar, F||de Lesquen, A||Lopiano, D||Luehring, FC||Maki, T||Makino, S||Masaike, A||Matulenko, Yu A||Meschanin, AP||Michalowicz, A||Miller, DH||Miyake, K||Nagamine, T||Nessi-Tedaldi, F||Nessi, M||Nguyen, C||Nurushev, SB||Ohashi, Y||Onel, Y||Patalakha, DI||Pauletta, G||Penzo, A||Read, AL||Roberts, JB||van Rossum, L||Rykov, VL||Saito, N||Salvato, G||Schiavon, P||Shepard, J||Skeens, J||Solovyanov, VL||Spinka, H||Takashima, R||Takeutchi, F||Tamura, N||Tanaka, N||Underwood, DG||Vasiliev, AN||Villari, A||White, JL||Yamashita, S||Yokosawa, A||Yoshida, T||Zanetti, A

publication date

  • May 1991