Single-spin asymmetries and invariant cross sections of the high transverse-momentum inclusive pi 0 production in 200 GeV/c pp and p-barp interactions.

The 0 inclusive and semi-inclusive, single-spin asymmetries have been measured using transversely polarized, 200-GeV/c proton and antiproton beams colliding with an unpolarized hydrogen target. The measured asymmetries are consistent with zero within the experimental uncertainties for the kinematic region -0.15<(formula presented)3 GeV/c were not correct. These data indicate that PQCD expectations seem confirmed and the higher-twist contribution to the single-spin asymmetry in 0 production at xF=0 is not large. Additional evidence for such a conclusion comes from the measurement of a semi-inclusive 0 asymmetry, where associated charged particles are detected opposite to the 0 azimuthal direction. This experiment also provides high-statistics data on the inclusive 0 cross sections for pp and p-p collisions at s19.4 GeV. 1996 The American Physical Society.

Adams, D. L., Akchurin, N., Belikov, N. I., Bravar, A., Bystricky, J., Corcoran, M. D., ... Yokosawa, A.

Adams, DL||Akchurin, N||Belikov, NI||Bravar, A||Bystricky, J||Corcoran, MD||Cossairt, JD||Cranshaw, J||Derevschikov, AA||En'yo, H||Funahashi, H||Goto, Y||Grachov, OA||Grosnick, DP||Hill, DA||Iijima, T||Imai, K||Itow, Y||Iwatani, K||Krueger, KW||Kuroda, K||Lehar, F||Lopiano, D||Luehring, FC||Maki, T||Makino, S||Masaike, A||Matulenko, YA||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||Rykov, VL||Saito, N||Salvato, G||Schiavon, P||Shima, T||Skeens, J||Solovyanov, VL||Spinka, H||Stanek, RW||Takashima, R||Takeutchi, F||Tamura, N||Tanaka, N||Underwood, DG||Vasiliev, AN||White, JL||Yamashita, S||Yokosawa, A

Single-spin asymmetries and invariant cross sections of the high transverse-momentum inclusive pi 0 production in 200 GeV/c pp and p-barp interactions. Academic Article