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.B Roberts; J Bystricky; P Chaumette; M.D Corcoran; J.D Cossairt; J Cranshaw; J Deregel; A.A Derevschikov; G Durand; H En'yo; J Fabre; O.A Grachov; K Fukuda; D.P Grosnick; H Funahashi; D.A Hill; Y Goto; K Imai; Y 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; A Penzo; G Pauletta; A.L Read; 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; FNAL E581/704 Collaboration

doi:10.1016/0370-2693(91)91350-5

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

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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.B Roberts, J Bystricky, P Chaumette, M.D Corcoran, J.D Cossairt, J Cranshaw, J Deregel, …

Physics letters. B, Vol.261(1), pp.197-200

1991

DOI: 10.1016/0370-2693(91)91350-5

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Abstract

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.

Details

Title: Subtitle: First results for the two-spin parameter ALL in π0 production by 200 GeV polarized protons and antiprotons
Creators: D.L Adams - Rice University
N Akchurin - University of Iowa
N.I Belikov - Institute of High Energy Physics, SU-142 284 Serpukhov, USSR
J.B Roberts - Argonne National Laboratory
J Bystricky - CEN-Saclay, F-91191 Gif-sur-Yvette, France
P Chaumette - CEN-Saclay, F-91191 Gif-sur-Yvette, France
M.D Corcoran - Rice University
J.D Cossairt - Fermi National Accelerator Laboratory, Batavia, IL 60510, USA
J Cranshaw - Rice University
J Deregel - CEN-Saclay, F-91191 Gif-sur-Yvette, France
A.A Derevschikov - Institute of High Energy Physics, SU-142 284 Serpukhov, USSR
G Durand - CEN-Saclay, F-91191 Gif-sur-Yvette, France
H En'yo - Kyoto University
J Fabre - CEN-Saclay, F-91191 Gif-sur-Yvette, France
O.A Grachov - Institute of High Energy Physics, SU-142 284 Serpukhov, USSR
K Fukuda - Meiji College of Oriental Medicine, Funai-gun, Kyoto-fu 629-03, Japan
D.P Grosnick - Argonne National Laboratory
H Funahashi - Kyoto University
D.A Hill - Argonne National Laboratory
Y Goto - Kyoto University
K Imai - Kyoto University
Y Itow - Hiroshima University
K Iwatani - Argonne National Laboratory
T Kasprzyk - Argonne National Laboratory
K.W Krueger - Northeastern State University, [cxTalequah, OK] 74464, USA
K Kuroda - Laboratoire d’Annecy de Physique des Particules
M Laghai - Argonne National Laboratory
F Lehar - CEN-Saclay, F-91191 Gif-sur-Yvette, France
A de Lesquen - Argonne National Laboratory
D Lopiano - Northwestern University
F.C Luehring - Physics Department, Northwestern University, Evanston, IL 60201, USA
T Maki - University of Occupational and Environmental Health Japan
S Makino - Kyoto University
A Masaike - Kyoto University
Yu.A Matulenko - Institute of High Energy Physics, SU-142 284 Serpukhov, USSR
A.P Meschanin - Institute of High Energy Physics, SU-142 284 Serpukhov, USSR
A Michalowicz - Northwestern University
D.H Miller - Kyoto University
K Miyake - Kyoto University
T Nagamine - Rice University
F Nessi-Tedaldi - Rice University
M Nessi - Rice University
C Nguyen - Rice University
S.B Nurushev - Argonne National Laboratory
Y Ohashi - University of Iowa
Y Onel - University of Iowa
D.I Patalakha - University of Udine
A Penzo - Fermi National Accelerator Laboratory
G Pauletta - University of Trieste
A.L Read - Rice University
L van Rossum - Argonne National Laboratory
V.L Rykov - Kyoto University
N Saito - University of Messina
G Salvato - University of Trieste
P Schiavon - Argonne National Laboratory
J Shepard - Rice University
J Skeens - Rice University
V.L Solovyanov - Argonne National Laboratory
H Spinka - Kyoto University
R Takashima - Kyoto Sangyo University
F Takeutchi - Okayama University
N Tamura - Los Alamos National Laboratory
N Tanaka - Argonne National Laboratory
D.G Underwood - Argonne National Laboratory
A.N Vasiliev - Institute of High Energy Physics, SU-142 284 Serpukhov, USSR
A Villari - Rice University
J.L White - Kyoto University
S Yamashita - Argonne National Laboratory
A Yokosawa - Osaka City University
T Yoshida - University of Trieste
A Zanetti - University of Trieste
FNAL E581/704 Collaboration
Resource Type: Journal article
Publication Details: Physics letters. B, Vol.261(1), pp.197-200
DOI: 10.1016/0370-2693(91)91350-5
ISSN: 0370-2693
eISSN: 1873-2445
Publisher: Elsevier B.V
Language: English
Date published: 1991
Academic Unit: Physics and Astronomy
Record Identifier: 9984199844802771

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