; Court, G. R. ; Dalpiaz, P. F. ; De Sanctis, E. ; De Schepper, D. ; Devitsin, E. ; de Witt Huberts, P. K. A. ; Di Nezza, P. ; Düren, M. ; Dvoredsky, A. ; Elbakian, G. ; Ely, J. ; Fantoni, A. ; Ferstl, M. ; Fiedler, K. ; Filippone, B. W. ; Fischer, H. ; Fox, B. ; Franz, J. ; Frullani, S. ; Funk, M.-A. ; Gärber, Y. ; Garibaldi, F. ; Gavrilov, G. ; Geiger, P. ; Gharibyan, V. ; Golendukhin, A. ; Graw, G. ; Grebeniouk, O. ; Green, P. W. ; Greeniaus, L. G. ; Grosshauser, C. ; Guidal, M. ; Gute, A. ; Haeberli, W. ; Hansen, J.-O. ; Hasch, D. ; Häusser, O. ; Heinsius, F. H. ; Henderson, R. ; Henoch, M. ; Hertenberger, R. ; Holler, Y. ; Holt, R. J. ; Hoprich, W. ; Ihssen, H. ; Iodice, M. ; Izotov, A. ; Jackson, H. E. ; Jgoun, A. ; Kaiser, R. ; Kinney, E. ; Kisselev, A. ; Kitching, P. ; Kobayashi, H. ; Koch, N. ; Königsmann, K. ; Kolstein, M. ; Kolster, H. ; Korotkov, V. ; Korsch, W. ; Kozlov, V. ; Kramer, L. H. ; Kurisuno, M. ; Kyle, G. ; Lachnit, W. ; Lorenzon, W. ; Makins, N. C. R. ; Martens, F. K. ; Martin, J. W. ; Masoli, F. ; Mateos, A. ; McAndrew, M. ; McIlhany, K. ; McKeown, R. D. ; Meissner, F. ; Menden, F. M. ; Metz, A. ; Meyners, N. ; Mikloukho, O. ; Miller, C. A. ; Miller, M. A. ; Milner, R. ; Most, A. ; Muccifora, V. ; Naryshkin, Y. ; Nathan, A. M. ; Neunreither, F. ; Niczyporuk, M. ; Nowak, W.-D. ; O'Neill, T. G. ; Openshaw, R. ; Ouyang, J. ; Owen, B. R. ; Pate, S. F. ; Potashov, S. ; Potterveld, D. H. ; Rakness, G. ; Redwine, R. ; Reolon, A. R. ; Ristinen, R. ; Rith, K. ; Rossi, P. ; Rudnitsky, S. ; Ruh, M. ; Ryckbosch, D. ; Sakemi, Y. ; Scarlett, C. ; Schäfer, A. ; Schmidt, F. ; Schmitt, H. ; Schnell, G. ; Schüler, K. P. ; Schwind, A. ; Seibert, J. ; Shibata, T.-A. ; Shibatani, K. ; Shin, T ; Shutov, V. ; Simani, C. ; Simon, A. ; Sinram, K. ; Slavich, P. ; Spengos, M. ; Steffens, E. ; Stenger, J. ; Stewart, J. ; Stoesslein, U. ; Sutter, M. ; Tallini, H. ; Taroian, S. ; Terkulov, A.
; Tipton, B. ; Tytgat, M.
; Uriuoli, G. M. ; van de Vyver, R. ; van den Brand, J. F. J. ; van der Steenhoven, G. ; van Hunen, J. J. ; Vetterli, M. C.
; Vikhrov, V. ; Vincter, M. G.
; Visser, J. ; Volk, E. ; Wander, W. ; Wendland, J. ; Williamson, S. E. ; Wise, T. ; Woller, K. ; Yoneyama, S. ; Zohrabian, H. | Item type: | Article | ||||
|---|---|---|---|---|---|
| Journal or Publication Title: | Physical Review Letters | ||||
| Publisher: | AMERICAN PHYSICAL SOC | ||||
| Place of Publication: | COLLEGE PK | ||||
| Volume: | 84 | ||||
| Number of Issue or Book Chapter: | 12 | ||||
| Page Range: | pp. 2584-2588 | ||||
| Date: | 2000 | ||||
| Institutions: | Physics > Institute of Theroretical Physics > Chair Professor Schäfer > Group Andreas Schäfer | ||||
| Identification Number: |
| ||||
| Keywords: | DEEP-INELASTIC-SCATTERING; LEPTON-NUCLEON SCATTERING; MONTE-CARLO GENERATOR; ORDER QCD ANALYSIS; QUARK DISTRIBUTIONS; POLARIZED GLUON; HERA; COLLISIONS; MESONS; PROTON; | ||||
| Dewey Decimal Classification: | 500 Science > 530 Physics | ||||
| Status: | Published | ||||
| Refereed: | Yes, this version has been refereed | ||||
| Created at the University of Regensburg: | Yes | ||||
| Item ID: | 74372 |
Abstract
We present a measurement of the longitudinal spin asymmetry Ali in photoproduction of pairs of hadrons with high transverse momentum pi. Data were accumulated by the HERMES experiment using a 27.5 GeV polarized positron beam and a polarized hydrogen target internal to the HERA storage ring. For h(+)h(-) pairs with p(T)(h1) > 1.5 GeV/c and p(T)(h2) > 1.0 GeV/c, the measured asymmetry is A(parallel ...

Abstract
We present a measurement of the longitudinal spin asymmetry Ali in photoproduction of pairs of hadrons with high transverse momentum pi. Data were accumulated by the HERMES experiment using a 27.5 GeV polarized positron beam and a polarized hydrogen target internal to the HERA storage ring. For h(+)h(-) pairs with p(T)(h1) > 1.5 GeV/c and p(T)(h2) > 1.0 GeV/c, the measured asymmetry is A(parallel to) = -0.28 +/- 0.12(stat) +/- 0.02(syst). This negative value is in contrast to the positive asymmetries typically measured in deep inelastic scattering: from protons, and is interpreted to arise from a positive gluon polarization.
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