ITA
ENG

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

Authors

Ackerstaff, K Airapetian, A Akopov, N Akushevich, I Amarian, M Aschenauer, EC Avakian, H Avakian, R Avetissian, A Bains, B Barrow, S Baumgarten, C Beckmann, M Belostotski, S Belz, JE Benisch, T Bernreuther, S Bianchi, N Blanchard, S Blouw, J Bottcher, H Borissov, A Brack, J Brauksiepe, S Braun, B Bray, B Brons, S Bruckner, W Brull, A Bruins, EEW Bulten, HJ Cadman, R Capitani, GP Carter, P Chumney, P Cisbani, E Court, GR Dal Piaz, PF Delheij, PPJ De Sanctis, E De Schepper, D Devitsin, E Huberts, PKAD Di Nezza, P Duren, M Dvoredsky, A Elbakian, G Ely, J Emerson, J Fantoni, A Fechtchenko, A Ferstl, M Fick, D Fiedler, K Filippone, BW Fischer, H Fortune, HT Fox, B Frabetti, S Franz, J Frullani, S Funk, MA Gagunashvili, ND Galumian, P Gao, H Garber, Y Garibaldi, F Gavrilov, G Geiger, P Gharibyan, V Gyurjyan, V Golendoukhin, A Graw, G Grebeniouk, O Green, PW Greeniaus, LG Grosshauser, C Guidal, MG Gute, A Gyurjyan, V Haas, JP Haeberli, W Hansen, JO Hasch, D Hausser, O Heinsius, FH Henderson, R Henkes, T Henoch, M Hertenberger, R Holler, Y Holt, RJ Hoprich, W Ihssen, H Iodice, M Izotov, A Jackson, HE Jgoun, A Jones, C Kaiser, R Kinney, E Kirsch, M Kisselev, A Kitching, P Kobayashi, H Koch, N Konigsmann, K Kolstein, M Kolster, H Korotkov, V Korsch, W Kozlov, V Kramer, LH Krause, B Krivokhijine, VG Kuckes, M Kummell, F Kyle, G Lachnit, W Lorenzon, W Lung, A Makins, NCR Manaenkov, SI Martens, FK Martin, JW Masoli, F Mateos, A McAndrew, M McIlhany, K McKeown, RD Meissner, F Menden, F Mercer, D Metz, A Meyners, N Mikloukho, O Miller, CA Miller, MA Milner, R Mitsyn, V Most, A Mozzetti, R Muccifora, V Nagaitsev, A Naryshkin, Y Nathan, AM Neunreither, F Niczyporuk, M Nowak, WD Nupieri, M Oelwein, P Ogami, H O'Neill, TG Openshaw, R Ouyang, J Owen, B Papavassiliou, V Pate, SF Pitt, M Poolman, HR Potashov, S Potterveld, DH Rakness, G Reali, A Redwine, R Reolon, AR Ristinen, R Rith, K Roloff, H Roper, G Rossi, P Rudnitsky, S Ruh, M Ryckbosch, D Sakemi, Y Savin, I Scarlett, C Schmidt, F Schmitt, H Schnell, G Schuler, KP Schwind, A Seibert, J Shibata, TA Shin, T Shutov, V Simani, MC Simon, A Sinram, K Slavich, P Smythe, WR Sowinski, J Spengos, M Steffens, E Stenger, J Stewart, J Stock, F Stoesslein, U Sutter, M Tallini, H Taroian, S Terkulov, A Thiessen, DM Thomas, E Tipton, B Trudel, A Tytgat, M Urciuoli, GM van Hunen, JJ van de Vyver, R van den Brand, JFJ van der Steenhoven, G Vetterli, MC Vincter, M Visser, J Volk, E Wander, W Welch, TP Williamson, SE Wise, T Woller, K Yoneyama, S Zapfe-Duren, K Zohrabian, H Zurmuhle, R

Citation

K. Ackerstaff et al., Determination of the deep inelastic contribution to the generalised Gerasimov-Drell-Hearn integral for the proton and neutron, PHYS LETT B, 444(3-4), 1998, pp. 531-538

Citations number

Categorie Soggetti

Physics

Journal title

PHYSICS LETTERS B

ISSN journal

03702693 → ACNP

Volume

444

Issue

3-4

Year of publication

1998

Pages

531 - 538

Database

ISI

SICI code

0370-2693(199812)444:3-4<531:DOTDIC>2.0.ZU;2-3

Abstract

The virtual photon absorption cross section differences [alpha(1/2) - alpha (3/2)] for the proton and neutron have been determined from measurements of polarised cross section asymmetries in deep inelastic scattering of 27.5 G eV longitudinally polarised positrons from polarised H-1 and He-3 internal gas targets. The data were collected in the region above the nucleon resona nces in the kinematic range v < 23.5 GeV and 0.8 GeV2 < Q(2) < 12 GeV2. For the proton the contribution to the generalised Gerasimov-Drell-Hearn integ ral was found to be substantial and must be included for an accurate determ ination of the full integral. Furthermore the data are consistent with a QC D next-to-leading order fit based on previous deep inelastic scattering dat a. Therefore higher twist effects do not appear significant. (C) 1998 Elsev ier Science B.V. All rights reserved.