Journal article
Measurement of the double-spin asymmetry ALL for inclusive multi-γ pair production with 200 GeV/ c polarized proton beam and polarized proton target
Physics letters. B, Vol.336(2), pp.269-274
1994
DOI: 10.1016/0370-2693(94)00998-8
Abstract
The invariant double-differential cross section, E1E2d6σ / dp31dp32, and the double-spin asymmetry, A LL, for inclusive multi-γ pair production in which γ-rays came from neutral mesons were measured with a 200 GeV/c longitudinally-polarized proton beam and a longitudinally-polarized proton target. Most of the multi-γ pairs comes from two-jet type events which are sensitive to partonic interaction. The ALL values were found to be consistent with zero. The invariant double-differential cross section for inclusive π0π0 production was also measured. These measured cross sections are consistent with LUND Monte Carlo simulations. Using the LUND Monte Carlo simulation package with the Carlitz-Kaur model of spin dependent distribution functions of valence quarks, the ALL values have been compared with theoretical predictions of gluon polarization, ΔG/G. The results put restrictions on the size of ΔG/G in the region of 0.05 ⪅ x ⪅ 0.35.
Details
- Title: Subtitle
- Measurement of the double-spin asymmetry ALL for inclusive multi-γ pair production with 200 GeV/ c polarized proton beam and polarized proton target
- Creators
- D.L Adams - University of IowaN Akchurin - University of IowaN.I Belikov - University of TriesteA Bravar - University of TriesteJ Bystricky - CEN-Saclay, F-91191 Gif-sur-Yvette, FranceP Chaumette - Rice UniversityM.D Corcoran - Fermi National Accelerator LaboratoryJ.D Cossairt - Rice UniversityJ Cranshaw - Rice UniversityJ Deregel - CEN-Saclay, F-91191 Gif-sur-Yvette, FranceA.A Derevschikov - Institute for High Energy PhysicsG Durand - Kyoto UniversityH En'yo - Kyoto UniversityY Goto - Kyoto UniversityJ Fabre - FunaiO.A Grachov - Argonne National LaboratoryK Fukuda - Kyoto UniversityD.P Grosnick - Argonne National LaboratoryD.A Hill - Kyoto UniversityH Funahashi - Kyoto UniversityT Iijima - Kyoto UniversityK Imai - Kyoto UniversityY Itow - Hiroshima UniversityK Iwatani - Argonne National LaboratoryT Kasprzyk - Northeastern State UniversityK.W Krueger - Northeastern State University, Talequah, OK 74464, USAK Kuroda - Argonne National LaboratoryM Laghai - Argonne National LaboratoryF Lehar - CEN-Saclay, F-91191 Gif-sur-Yvette, FranceA de Lesquen - Argonne National LaboratoryD Lopiano - Northwestern UniversityF.C Luehring - Physics Department, Northwestern University, Evanston, IL 60201, USAT Maki - Kyoto UniversityS Makino - Kyoto UniversityA Masaike - Kyoto UniversityYu.A Matulenko - Institute for High Energy PhysicsA.P Meschanin - Institute for High Energy PhysicsA Michalowicz - Northwestern UniversityD.H Miller - Kyoto UniversityK Miyake - Kyoto UniversityT Nagamine - Rice UniversityF Nessi-Tedaldi - Rice UniversityM Nessi - Rice UniversityC Nguyen - Rice UniversityS.B Nurushev - Argonne National LaboratoryY Ohashi - University of IowaY Onel - University of IowaD.I Patalakha - University of UdineG Pauletta - University of TriesteA Penzo - Fermi National Accelerator LaboratoryA.L Read - Rice UniversityJ.B Roberts - Argonne National LaboratoryL van Rossum - Fermi National Accelerator Laboratory, Botavia, IL 60510, USAV.L Rykov - Kyoto UniversityN Saito - University of MessinaG Salvato - University of TriesteP Schiavon - Argonne National LaboratoryJ Shepard - Rice UniversityJ Skeens - Rice UniversityV.L Solovyanov - Argonne National LaboratoryH Spinka - Kyoto UniversityR Takashima - Kyoto Sangyo UniversityF Takeutchi - Okayama UniversityN Tamura - Los Alamos National LaboratoryN Tanaka - Argonne National LaboratoryD.G Underwood - Argonne National LaboratoryA.N Vasiliev - University of MessinaA Villari - Rice UniversityJ.L White - Kyoto UniversityS Yamashita - Argonne National LaboratoryA Yokosawa - Osaka City UniversityT Yoshida - University of TriesteA Zanetti - University of TriesteFNAL E581/704 Collaboration
- Resource Type
- Journal article
- Publication Details
- Physics letters. B, Vol.336(2), pp.269-274
- DOI
- 10.1016/0370-2693(94)00998-8
- ISSN
- 0370-2693
- eISSN
- 1873-2445
- Publisher
- Elsevier B.V
- Language
- English
- Date published
- 1994
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984199954102771
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