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Measurement of the spin asymmetry in the photoproduction of pairs of high $\mathrm{p_T}$ hadrons at HERMES

Authors :
Airapetian, A.
Akopov, N.
Amarian, M.
Aschenauer, E. C.
Avakian, H.
Avakian, R.
Avetissian, A.
Bains, B.
Baumgarten, C.
Beckmann, M.
Belostotski, S.
Belz, J. E.
Benisch, Th.
Bernreuther, S.
Bianchi, N.
Blouw, J.
Bottcher, H.
Borissov, A.
Brack, J.
Brauksiepe, S.
Braun, B.
Bruckner, W.
Brull, A.
Bulten, H. J.
Capitani, G. P.
Carter, P.
Chumney, P.
Cisbani, E.
Court, G. R.
Dalpiaz, P. F.
De Sanctis, E.
De Schepper, D.
Devitsin, E.
De Witt Huberts, P. K. A.
Di Nezza, P.
Duren, 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.
Garber, 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.
Hausser, 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.
Konigsmann, 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.
Schafer, A.
Schmidt, F.
Schmitt, H.
Schnell, G.
Schuler, 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.
Publication Year :
2000
Publisher :
Deutsches Elektronen-Synchrotron, DESY, Hamburg, 2000.

Abstract

Physical review letters 84(12), 2584 - 2588 (2000). doi:10.1103/PhysRevLett.84.2584<br />We present a measurement of the longitudinal spin asymmetry A_|| in photoproduction of pairs of hadrons with high transverse momentum p_T. 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^h_1 > 1.5 GeV/c and p_T^h_2 > 1.0 GeV/c, the measured asymmetry is A_|| = -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.<br />Published by APS, College Park, Md.

Subjects

Subjects :
positron: polarized beam
DESY HERA Stor
27.5 GeV
polarization: asymmetry
positron p: deep inelastic scattering
positron p --> hadron+ hadron- positron anything
polarization: longitudinal
polarized target: internal
HERMES
gluon: polarization
hadron: pair production
experimental results

Details

Language :
English
Database :
OpenAIRE
Accession number :
edsair.doi...........240f984d70e38e15aa0ce8970479568f
Full Text :
https://doi.org/10.3204/pubdb-2017-10226
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