Single-spin asymmetries and invariant cross sections of the high transverse-momentum inclusive {pi}{sup 0} production in 200 GeV/c {ital pp} and {ital {bar p}}{ital p} interactions

Journal Article · Fri Sep 01 00:00:00 EDT 1995 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.48873· OSTI ID:257288

Adams, D L ^[1]; Akchurin, N ^[2]; Belikov, N I ^[3]; Bravar, A ^[4]; Bystricky, J ^[5]; Corcoran, M D ^[1]; Cossairt, J D ^[6]; Cranshaw, J ^[1]; Derevschikov, A A ^[3]; En`yo, H; Funahashi, H; Goto, Y ^[7]; Grachov, O A ^[8]; Grosnick, D P; Hill, D A ^[9]; Imai, K; Itow, Y ^[7]; Iwatani, K ^[10]; Krueger, K W ^[11]; Kuroda, K ^[12] ; Laghai, M ^[9]; Lehar, F; de Lesquen, A ^[5]; Lopiano, D ^[9]; Luehring, F C ^[13]; Maki, T ^[14]; Makino, S; Masaike, A ^[15]; Matulenko, Y A; Meschanin, A P

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1. T. W. Bonner Nuclear Laboratory, Rice University, Houston, Texas 77251 (United States)
2. Department of Physics, University of Iowa, Iowa City, Iowa 52242 (United States)
3. Institute for High Energy Physics, 142284, Protvino (Russia)
4. Dipartimento di Fisica, Universita di Trieste, I-34100 Trieste (Italy)
5. CEN-Saclay, F-91191 Gif-sur-Yvette (France)
6. Fermi National Accelerator Laboratory, Batavia, Illinois 60510 (United States)
7. Department of Physics, Kyoto University, Kyoto 606 (Japan)
8. Institute of High Energy Physics, 142284, Protvino (Russia)
9. Argonne National Laboratory, Argonne, Illinois 60439 (United States)
10. Hiroshima University, Higashi-Hiroshima 724 (Japan)
11. Northeastern State University, Talequah, Oklahoma 74464 (United States)
12. Laboratoire de Physique des Particules, B.P. 909, F-74017 Annecy-le-Vieux (France)
13. Physics Department, Northwestern University, Evanston, Illinois 60201 (United States)
14. University of Occupational and Environmental Health, Kita-Kyushu 807 (Japan)
15. Department of Physcis, Kyoto University, Kyoto 606 (Japan)

The {pi}{sup 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 a value of zero within the error bars for the kinematic regions, -0.15{much_gt}{ital x}{sub {ital F}}{much_gt}+0.15 and 1{much_gt}{ital p}{sub {ital T}}{much_gt}4.5 GeV/c. These data indicate that the higher-twist contribution in QCD to the single-spin asymmetry in inclusive {pi}{sup 0} production may not be as large as was previously expected. Additional evidence for such a conclusion comes from the measurement of a semi-inclusive {pi}{sup 0}-charged particle asymmetry, where the associated charged particles are detected opposite to the {pi}{sup 0} azimuthal direction. This experiment also has a high-statistics measurement of the inclusive {pi}{sup 0} cross sections for {ital pp} and {ital {bar p}}{ital p} collisions at 200 GeV/c. {copyright} {ital 1995 American Institute of Physics.}

• Research Organization: Fermi National Accelerator Laboratory
• DOE Contract Number: AC02-76CH03000; W-31109-ENG-38; W-7405-ENG-36; AC02-76ER02289
• OSTI ID: 257288
• Report Number(s): CONF-9409103-; ISSN 0094-243X; TRN: 96:016081
• Journal Information: AIP Conference Proceedings, Vol. 343, Issue 1; Conference: 11. international symposia on high energy spin physics and polarization phenomena in nuclear physics, Bloomington, IN (United States), 15-22 Sep 1994; Other Information: PBD: Sep 1995
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
PROTON-PROTON INTERACTIONS
POLARIZATION-ASYMMETRY RATIO
PROTON-ANTIPROTON INTERACTIONS
PIONS NEUTRAL
PARTICLE PRODUCTION
GEV RANGE 100-1000
INCLUSIVE INTERACTIONS