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Determination of the deep inelastic contribution to the generalised Gerasimov-Drell-Hearn integral for the proton and neutron

1998; Elsevier BV; Volume: 444; Issue: 3-4 Linguagem: Inglês

10.1016/s0370-2693(98)01396-3

1873-2445

K. Ackerstaff, A. Airapetian, Н. Акопов, Igor Akushevich, M. Amarian, E. C. Aschenauer, H. Avakian, R. Avakian, A. Avetissian, B. Bains, S. Barrow, C. Baumgarten, M. Beckmann, S. Belostotski, J. Belz, T. Benisch, S. Bernreuther, N. Bianchi, S. Blanchard, J. Blouw, H. Böttcher, A. Borissov, J. Brack, S. Brauksiepe, B. Braun, B. Bray, S. Brons, W. Brückner, A. Brüll, E. E. W. Bruins, H. J. Bulten, R. V. Cadman, G. P. Capitani, Paul Carter, P. Chumney, E. Cisbani, G.R. Court, P.F. Dal Piaz, P. P. J. Delheij, E. De Sanctis, D. De Schepper, E. Devitsin, P. K. A. de Witt Huberts, P. Di Nezza, M. Düren, A. Dvoredsky, G. Elbakian, J. Ely, Joseph Emerson, A. Fantoni, A. Fechtchenko, M. Ferstl, D. Fick, K. Fiedler, B. W. Filippone, H. Fischer, H. T. Fortune, B. Fox, S. Frabetti, J. Franz, S. Frullani, M.-A. Funk, N. Gagunashvili, P. Galumian, H. Gao, Y. Gärber, F. Garibaldi, G. Gavrilov, P. Geiger, V. Gharibyan, V. Gyurjyan, A. Golendoukhin, G. Graw, O. Grebeniouk, P. W. Green, L. G. Greeniaus, C. Großhauser, M. Guidal, A. Gute, V. Gyurjyan, J. Haas, W. Haeberli, J.-O. Hansen, D. Hasch, O. Häusser, F. H. Heinsius, R. Henderson, T. Henkes, M. Henoch, G. Herten, Y. Holler, R. J. Holt, W. Hoprich, H. Ihssen, M. Iodice, A. Izotov, H.E. Jackson, A. Jgoun, Catherine Jones, R. Kaiser, E. Kinney, M. Kirsch, A. Kisselev, P. Kitching, Hideaki Kobayashi, N. Koch, K. Königsmann, M. Kolstein, H. Kolster, В. А. Коротков, W. Korsch, V. Kozlov, L. H. Kramer, B. Krause, V. G. Krivokhijine, M. Kückes, F. Kümmell, G. S. Kyle, W. Lachnit, W. Lorenzon, A. Lung, N. C. R. Makins, S. I. Manaenkov, F. K. Martens, J. W. Martin, F. Masoli, A. Mateos, M. McAndrew, K. McIlhany, R. D. McKeown, F. Meißner, F. Menden, D. Mercer, Andreas Metz, N. Meyners, O. Mikloukho, C. Andrew Miller, Meredith Miller, R. Milner, V. V. Mitsyn, A. Most, R. Mozzetti, V. Muccifora, А. Нагайцев, Y. Naryshkin, A. M. Nathan, F. Neunreither, M. Niczyporuk, W.‐D. Nowak, M. Nupieri, P. Oelwein, H. Ogami, T. G. O’Neill, R. Openshaw, J. Ouyang, B. Owen, V. Papavassiliou, S. F. Pate, M. Pitt, H. R. Poolman, S. Potashov, D. H. Potterveld, G. Rakness, A. Reali, R. Redwine, A. R. Reolon, R. Ristinen, K. Rith, H. Roloff, G. Röper, P. Rossi, S. Rudnitsky, M. Ruh, D. Ryckbosch, Y. Sakemi, I. Savin, C. Scarlett, Friedrich Schmidt, H. Schmitt, G. Schnell, K. P. Schüler, A. Schwind, J. Anthony Seibert, T.-A. Shibata, T. Shin, V. Shutov, M. C. Simani, A. Simon, K. Sinram, P. Slavich, W. R. Smythe, J. Sowinski, M. Spengos, E. Steffens, J. Stenger, J. Stewart, F. Stock, U. Stoesslein, M. Sutter, H. Tallini, S. Taroian, A. Terkulov, Douglas Michael Thiessen, Eric Thomas, B. Tipton, A. Trudel, M. Tytgat, G. M. Urciuoli, J. van den Brand, R. van de Vyver, J. van den Brand, G. van der Steenhoven, M. C. Vetterli, M. G. Vincter, J. Visser, E. Volk, W. Wander, T. P. Welch, S. E. Williamson, T. Wise, Kevin B. Woller, S. Yoneyama, K. Zapfe-Düren, H. Zohrabian, R. Zurmühle,

Quantum Chromodynamics and Particle Interactions

The virtual photon absorption cross section differences [σ1/2−σ3/2] for the proton and neutron have been determined from measurements of polarised cross section asymmetries in deep inelastic scattering of 27.5 GeV longitudinally polarised positrons from polarised 1H and 3He internal gas targets. The data were collected in the region above the nucleon resonances in the kinematic range ν< 23.5 GeV and 0.8 GeV2<Q2< 12 GeV2. For the proton the contribution to the generalised Gerasimov-Drell-Hearn integral was found to be substantial and must be included for an accurate determination of the full integral. Furthermore the data are consistent with a QCD next-to-leading order fit based on previous deep inelastic scattering data. Therefore higher twist effects do not appear significant.