The Q2-dependence of the generalised Gerasimov-Drell-Hearn integral for the deuteron, proton and neutron

A. Airapetian, N. Akopov, Z. Akopov, M. Amarian, V. V. Ammosov, E. C. Aschenauer, R. Avakian, A. Avetissian, E. Avetissian, P. Bailey, V. Baturin, C. Baumgarten, M. Beckmann, S. Belostotski, S. Bernreuther, N. Bianchi, H. P. Blok, H. Böttcher, A. Borissov, Othmane BouhaliM. Bouwhuis, J. Brack, S. Brauksiepe, A. Brüll, I. Brunn, G. P. Capitani, H. C. Chiang, G. Ciullo, G. R. Court, P. F. Dalpiaz, R. De Leo, L. De Nardo, E. De Sanctis, E. Devitsin, P. Di Nezza, M. Düren, M. Ehrenfried, A. Elalaoui-Moulay, G. Elbakian, F. Ellinghaus, U. Elschenbroich, J. Ely, R. Fabbri, A. Fantoni, A. Fechtchenko, L. Felawka, H. Fischer, B. Fox, J. Franz, S. Frullani, Y. Gärber, G. Gapienko, V. Gapienko, F. Garibaldi, E. Garutti, G. Gavrilov, V. Gharibyan, G. Graw, O. Grebeniouk, P. W. Green, L. G. Greeniaus, A. Gute, W. Haeberli, K. Hafidi, M. Hartig, D. Hasch, D. Heesbeen, F. H. Heinsius, M. Henoch, R. Hertenberger, W. H.A. Hesselink, A. Hillenbrand, Y. Holler, B. Hommez, G. Iarygin, A. Izotov, H. E. Jackson, A. Jgoun, R. Kaiser, E. Kinney, A. Kisselev, P. Kitching, K. Königsmann, H. Kolster, M. Kopytin, V. Korotkov, E. Kotik, V. Kozlov, B. Krauss, V. G. Krivokhijine, L. Lagamba, L. Lapikás, A. Laziev, P. Lenisa, P. Liebing, T. Lindemann, K. Lipka, W. Lorenzon, N. C.R. Makins, H. Marukyan, F. Masoli, F. Menden, V. Mexner, N. Meyners, O. Mikloukho, C. A. Miller, Y. Miyachi, V. Muccifora, A. Nagaitsev, E. Nappi, Y. Naryshkin, A. Nass, W. D. Nowak, K. Oganessyan, H. Ohsuga, G. Orlandi, S. Podiatchev, S. Potashov, D. H. Potterveld, M. Raithel, D. Reggiani, P. E. Reimer, A. Reischl, A. R. Reolon, K. Rith, G. Rosner, A. Rostomyan, D. Ryckbosch, I. Sanjiev, F. Sato, I. Savin, C. Scarlett, A. Schäfer, C. Schill, G. Schnell, K. P. Schüler, A. Schwind, J. Seibert, B. Seitz, R. Shanidze, T. A. Shibata, V. Shutov, M. C. Simani, K. Sinram, M. Stancari, M. Statera, E. Steffens, J. J.M. Steijger, J. Stewart, U. Stösslein, K. Suetsugu, H. Tanaka, S. Taroian, A. Terkulov, O. Teryaev, S. Tessarin, E. Thomas, A. Tkabladze, M. Tytgat, G. M. Urciuoli, P. van der Nat, G. van der Steenhoven, R. van de Vyver, M. C. Vetterli, V. Vikhrov, M. G. Vincter, J. Visser, M. Vogt, J. Volmer, C. Weiskopf, J. Wendland, J. Wilbert, T. Wise, S. Yen, S. Yoneyama, B. Zihlmann, H. Zohrabian, P. Zupranski

Research output: Contribution to journalArticle

44 Citations (Scopus)

Abstract

The Gerasimov-Drell-Hearn (GDH) sum rule connects the anomalous contribution to the magnetic moment of the target nucleus with an energy-weighted integral of the difference of the helicity-dependent photoabsorption cross sections. Originally conceived for real photons, the GDH integral can be generalised to the case of photons with virtuality Q2. For spin-1/2 targets such as the nucleon, it then represents the non-perturbative limit of the first moment Γ1 of the spin structure function g1(x, Q2) in deep inelastic scattering (DIS). The data collected by HERMES with a deuterium target are presented together with a re-analysis of previous measurements on the proton. This provides an unprecedented and complete measurement of the generalised GDH integral for photon-virtuality ranging over 1.2 < Q2 < 12.0 GeV2 and for photon-nucleon invariant mass squared W2 ranging over 1 < W2 < 45 GeV2, thus covering simultaneously the nucleon-resonance and the deep inelastic scattering regions. These data allow the study of the Q2-dependence of the full GDH integral, which is sensitive to both the Q2-evolution of the resonance form factors and contributions of higher twist. The contribution of the nucleon-resonance region is seen to decrease rapidly with increasing Q2. The DIS contribution is sizeable over the full measured range, even down to the lowest measured Q2. As expected, at higher Q2 the data are found to be in agreement with previous measurements of the first moment of g1. From data on the deuteron and proton, the GDH integral for the neutron has been derived and the proton-neutron difference evaluated. This difference is found to satisfy the fundamental Bjorken sum rule at Q2 = 5 GeV2.

Original languageEnglish
Pages (from-to)527-538
Number of pages12
JournalEuropean Physical Journal C
Volume26
Issue number4
DOIs
Publication statusPublished - 1 Feb 2003
Externally publishedYes

Fingerprint

Inelastic scattering
deuterons
Neutrons
Protons
Photons
neutrons
protons
inelastic scattering
photons
sum rules
moments
Deuterium
Magnetic moments
photoabsorption
form factors
deuterium
coverings
magnetic moments
nuclei
cross sections

ASJC Scopus subject areas

  • Engineering (miscellaneous)
  • Physics and Astronomy (miscellaneous)

Cite this

Airapetian, A., Akopov, N., Akopov, Z., Amarian, M., Ammosov, V. V., Aschenauer, E. C., ... Zupranski, P. (2003). The Q2-dependence of the generalised Gerasimov-Drell-Hearn integral for the deuteron, proton and neutron. European Physical Journal C, 26(4), 527-538. https://doi.org/10.1140/epjc/s2002-01118-x

The Q2-dependence of the generalised Gerasimov-Drell-Hearn integral for the deuteron, proton and neutron. / Airapetian, A.; Akopov, N.; Akopov, Z.; Amarian, M.; Ammosov, V. V.; Aschenauer, E. C.; Avakian, R.; Avetissian, A.; Avetissian, E.; Bailey, P.; Baturin, V.; Baumgarten, C.; Beckmann, M.; Belostotski, S.; Bernreuther, S.; Bianchi, N.; Blok, H. P.; Böttcher, H.; Borissov, A.; Bouhali, Othmane; Bouwhuis, M.; Brack, J.; Brauksiepe, S.; Brüll, A.; Brunn, I.; Capitani, G. P.; Chiang, H. C.; Ciullo, G.; Court, G. R.; Dalpiaz, P. F.; De Leo, R.; De Nardo, L.; De Sanctis, E.; Devitsin, E.; Di Nezza, P.; Düren, M.; Ehrenfried, M.; Elalaoui-Moulay, A.; Elbakian, G.; Ellinghaus, F.; Elschenbroich, U.; Ely, J.; Fabbri, R.; Fantoni, A.; Fechtchenko, A.; Felawka, L.; Fischer, H.; Fox, B.; Franz, J.; Frullani, S.; Gärber, Y.; Gapienko, G.; Gapienko, V.; Garibaldi, F.; Garutti, E.; Gavrilov, G.; Gharibyan, V.; Graw, G.; Grebeniouk, O.; Green, P. W.; Greeniaus, L. G.; Gute, A.; Haeberli, W.; Hafidi, K.; Hartig, M.; Hasch, D.; Heesbeen, D.; Heinsius, F. H.; Henoch, M.; Hertenberger, R.; Hesselink, W. H.A.; Hillenbrand, A.; Holler, Y.; Hommez, B.; Iarygin, G.; Izotov, A.; Jackson, H. E.; Jgoun, A.; Kaiser, R.; Kinney, E.; Kisselev, A.; Kitching, P.; Königsmann, K.; Kolster, H.; Kopytin, M.; Korotkov, V.; Kotik, E.; Kozlov, V.; Krauss, B.; Krivokhijine, V. G.; Lagamba, L.; Lapikás, L.; Laziev, A.; Lenisa, P.; Liebing, P.; Lindemann, T.; Lipka, K.; Lorenzon, W.; Makins, N. C.R.; Marukyan, H.; Masoli, F.; Menden, F.; Mexner, V.; Meyners, N.; Mikloukho, O.; Miller, C. A.; Miyachi, Y.; Muccifora, V.; Nagaitsev, A.; Nappi, E.; Naryshkin, Y.; Nass, A.; Nowak, W. D.; Oganessyan, K.; Ohsuga, H.; Orlandi, G.; Podiatchev, S.; Potashov, S.; Potterveld, D. H.; Raithel, M.; Reggiani, D.; Reimer, P. E.; Reischl, A.; Reolon, A. R.; Rith, K.; Rosner, G.; Rostomyan, A.; Ryckbosch, D.; Sanjiev, I.; Sato, F.; Savin, I.; Scarlett, C.; Schäfer, A.; Schill, C.; Schnell, G.; Schüler, K. P.; Schwind, A.; Seibert, J.; Seitz, B.; Shanidze, R.; Shibata, T. A.; Shutov, V.; Simani, M. C.; Sinram, K.; Stancari, M.; Statera, M.; Steffens, E.; Steijger, J. J.M.; Stewart, J.; Stösslein, U.; Suetsugu, K.; Tanaka, H.; Taroian, S.; Terkulov, A.; Teryaev, O.; Tessarin, S.; Thomas, E.; Tkabladze, A.; Tytgat, M.; Urciuoli, G. M.; van der Nat, P.; van der Steenhoven, G.; van de Vyver, R.; Vetterli, M. C.; Vikhrov, V.; Vincter, M. G.; Visser, J.; Vogt, M.; Volmer, J.; Weiskopf, C.; Wendland, J.; Wilbert, J.; Wise, T.; Yen, S.; Yoneyama, S.; Zihlmann, B.; Zohrabian, H.; Zupranski, P.

In: European Physical Journal C, Vol. 26, No. 4, 01.02.2003, p. 527-538.

Research output: Contribution to journalArticle

Airapetian, A, Akopov, N, Akopov, Z, Amarian, M, Ammosov, VV, Aschenauer, EC, Avakian, R, Avetissian, A, Avetissian, E, Bailey, P, Baturin, V, Baumgarten, C, Beckmann, M, Belostotski, S, Bernreuther, S, Bianchi, N, Blok, HP, Böttcher, H, Borissov, A, Bouhali, O, Bouwhuis, M, Brack, J, Brauksiepe, S, Brüll, A, Brunn, I, Capitani, GP, Chiang, HC, Ciullo, G, Court, GR, Dalpiaz, PF, De Leo, R, De Nardo, L, De Sanctis, E, Devitsin, E, Di Nezza, P, Düren, M, Ehrenfried, M, Elalaoui-Moulay, A, Elbakian, G, Ellinghaus, F, Elschenbroich, U, Ely, J, Fabbri, R, Fantoni, A, Fechtchenko, A, Felawka, L, Fischer, H, Fox, B, Franz, J, Frullani, S, Gärber, Y, Gapienko, G, Gapienko, V, Garibaldi, F, Garutti, E, Gavrilov, G, Gharibyan, V, Graw, G, Grebeniouk, O, Green, PW, Greeniaus, LG, Gute, A, Haeberli, W, Hafidi, K, Hartig, M, Hasch, D, Heesbeen, D, Heinsius, FH, Henoch, M, Hertenberger, R, Hesselink, WHA, Hillenbrand, A, Holler, Y, Hommez, B, Iarygin, G, Izotov, A, Jackson, HE, Jgoun, A, Kaiser, R, Kinney, E, Kisselev, A, Kitching, P, Königsmann, K, Kolster, H, Kopytin, M, Korotkov, V, Kotik, E, Kozlov, V, Krauss, B, Krivokhijine, VG, Lagamba, L, Lapikás, L, Laziev, A, Lenisa, P, Liebing, P, Lindemann, T, Lipka, K, Lorenzon, W, Makins, NCR, Marukyan, H, Masoli, F, Menden, F, Mexner, V, Meyners, N, Mikloukho, O, Miller, CA, Miyachi, Y, Muccifora, V, Nagaitsev, A, Nappi, E, Naryshkin, Y, Nass, A, Nowak, WD, Oganessyan, K, Ohsuga, H, Orlandi, G, Podiatchev, S, Potashov, S, Potterveld, DH, Raithel, M, Reggiani, D, Reimer, PE, Reischl, A, Reolon, AR, Rith, K, Rosner, G, Rostomyan, A, Ryckbosch, D, Sanjiev, I, Sato, F, Savin, I, Scarlett, C, Schäfer, A, Schill, C, Schnell, G, Schüler, KP, Schwind, A, Seibert, J, Seitz, B, Shanidze, R, Shibata, TA, Shutov, V, Simani, MC, Sinram, K, Stancari, M, Statera, M, Steffens, E, Steijger, JJM, Stewart, J, Stösslein, U, Suetsugu, K, Tanaka, H, Taroian, S, Terkulov, A, Teryaev, O, Tessarin, S, Thomas, E, Tkabladze, A, Tytgat, M, Urciuoli, GM, van der Nat, P, van der Steenhoven, G, van de Vyver, R, Vetterli, MC, Vikhrov, V, Vincter, MG, Visser, J, Vogt, M, Volmer, J, Weiskopf, C, Wendland, J, Wilbert, J, Wise, T, Yen, S, Yoneyama, S, Zihlmann, B, Zohrabian, H & Zupranski, P 2003, 'The Q2-dependence of the generalised Gerasimov-Drell-Hearn integral for the deuteron, proton and neutron', European Physical Journal C, vol. 26, no. 4, pp. 527-538. https://doi.org/10.1140/epjc/s2002-01118-x
Airapetian, A. ; Akopov, N. ; Akopov, Z. ; Amarian, M. ; Ammosov, V. V. ; Aschenauer, E. C. ; Avakian, R. ; Avetissian, A. ; Avetissian, E. ; Bailey, P. ; Baturin, V. ; Baumgarten, C. ; Beckmann, M. ; Belostotski, S. ; Bernreuther, S. ; Bianchi, N. ; Blok, H. P. ; Böttcher, H. ; Borissov, A. ; Bouhali, Othmane ; Bouwhuis, M. ; Brack, J. ; Brauksiepe, S. ; Brüll, A. ; Brunn, I. ; Capitani, G. P. ; Chiang, H. C. ; Ciullo, G. ; Court, G. R. ; Dalpiaz, P. F. ; De Leo, R. ; De Nardo, L. ; De Sanctis, E. ; Devitsin, E. ; Di Nezza, P. ; Düren, M. ; Ehrenfried, M. ; Elalaoui-Moulay, A. ; Elbakian, G. ; Ellinghaus, F. ; Elschenbroich, U. ; Ely, J. ; Fabbri, R. ; Fantoni, A. ; Fechtchenko, A. ; Felawka, L. ; Fischer, H. ; Fox, B. ; Franz, J. ; Frullani, S. ; Gärber, Y. ; Gapienko, G. ; Gapienko, V. ; Garibaldi, F. ; Garutti, E. ; Gavrilov, G. ; Gharibyan, V. ; Graw, G. ; Grebeniouk, O. ; Green, P. W. ; Greeniaus, L. G. ; Gute, A. ; Haeberli, W. ; Hafidi, K. ; Hartig, M. ; Hasch, D. ; Heesbeen, D. ; Heinsius, F. H. ; Henoch, M. ; Hertenberger, R. ; Hesselink, W. H.A. ; Hillenbrand, A. ; Holler, Y. ; Hommez, B. ; Iarygin, G. ; Izotov, A. ; Jackson, H. E. ; Jgoun, A. ; Kaiser, R. ; Kinney, E. ; Kisselev, A. ; Kitching, P. ; Königsmann, K. ; Kolster, H. ; Kopytin, M. ; Korotkov, V. ; Kotik, E. ; Kozlov, V. ; Krauss, B. ; Krivokhijine, V. G. ; Lagamba, L. ; Lapikás, L. ; Laziev, A. ; Lenisa, P. ; Liebing, P. ; Lindemann, T. ; Lipka, K. ; Lorenzon, W. ; Makins, N. C.R. ; Marukyan, H. ; Masoli, F. ; Menden, F. ; Mexner, V. ; Meyners, N. ; Mikloukho, O. ; Miller, C. A. ; Miyachi, Y. ; Muccifora, V. ; Nagaitsev, A. ; Nappi, E. ; Naryshkin, Y. ; Nass, A. ; Nowak, W. D. ; Oganessyan, K. ; Ohsuga, H. ; Orlandi, G. ; Podiatchev, S. ; Potashov, S. ; Potterveld, D. H. ; Raithel, M. ; Reggiani, D. ; Reimer, P. E. ; Reischl, A. ; Reolon, A. R. ; Rith, K. ; Rosner, G. ; Rostomyan, A. ; Ryckbosch, D. ; Sanjiev, I. ; Sato, F. ; Savin, I. ; Scarlett, C. ; Schäfer, A. ; Schill, C. ; Schnell, G. ; Schüler, K. P. ; Schwind, A. ; Seibert, J. ; Seitz, B. ; Shanidze, R. ; Shibata, T. A. ; Shutov, V. ; Simani, M. C. ; Sinram, K. ; Stancari, M. ; Statera, M. ; Steffens, E. ; Steijger, J. J.M. ; Stewart, J. ; Stösslein, U. ; Suetsugu, K. ; Tanaka, H. ; Taroian, S. ; Terkulov, A. ; Teryaev, O. ; Tessarin, S. ; Thomas, E. ; Tkabladze, A. ; Tytgat, M. ; Urciuoli, G. M. ; van der Nat, P. ; van der Steenhoven, G. ; van de Vyver, R. ; Vetterli, M. C. ; Vikhrov, V. ; Vincter, M. G. ; Visser, J. ; Vogt, M. ; Volmer, J. ; Weiskopf, C. ; Wendland, J. ; Wilbert, J. ; Wise, T. ; Yen, S. ; Yoneyama, S. ; Zihlmann, B. ; Zohrabian, H. ; Zupranski, P. / The Q2-dependence of the generalised Gerasimov-Drell-Hearn integral for the deuteron, proton and neutron. In: European Physical Journal C. 2003 ; Vol. 26, No. 4. pp. 527-538.
@article{65ed8750685b4b768cc9c67c99d1da92,
title = "The Q2-dependence of the generalised Gerasimov-Drell-Hearn integral for the deuteron, proton and neutron",
abstract = "The Gerasimov-Drell-Hearn (GDH) sum rule connects the anomalous contribution to the magnetic moment of the target nucleus with an energy-weighted integral of the difference of the helicity-dependent photoabsorption cross sections. Originally conceived for real photons, the GDH integral can be generalised to the case of photons with virtuality Q2. For spin-1/2 targets such as the nucleon, it then represents the non-perturbative limit of the first moment Γ1 of the spin structure function g1(x, Q2) in deep inelastic scattering (DIS). The data collected by HERMES with a deuterium target are presented together with a re-analysis of previous measurements on the proton. This provides an unprecedented and complete measurement of the generalised GDH integral for photon-virtuality ranging over 1.2 < Q2 < 12.0 GeV2 and for photon-nucleon invariant mass squared W2 ranging over 1 < W2 < 45 GeV2, thus covering simultaneously the nucleon-resonance and the deep inelastic scattering regions. These data allow the study of the Q2-dependence of the full GDH integral, which is sensitive to both the Q2-evolution of the resonance form factors and contributions of higher twist. The contribution of the nucleon-resonance region is seen to decrease rapidly with increasing Q2. The DIS contribution is sizeable over the full measured range, even down to the lowest measured Q2. As expected, at higher Q2 the data are found to be in agreement with previous measurements of the first moment of g1. From data on the deuteron and proton, the GDH integral for the neutron has been derived and the proton-neutron difference evaluated. This difference is found to satisfy the fundamental Bjorken sum rule at Q2 = 5 GeV2.",
author = "A. Airapetian and N. Akopov and Z. Akopov and M. Amarian and Ammosov, {V. V.} and Aschenauer, {E. C.} and R. Avakian and A. Avetissian and E. Avetissian and P. Bailey and V. Baturin and C. Baumgarten and M. Beckmann and S. Belostotski and S. Bernreuther and N. Bianchi and Blok, {H. P.} and H. B{\"o}ttcher and A. Borissov and Othmane Bouhali and M. Bouwhuis and J. Brack and S. Brauksiepe and A. Br{\"u}ll and I. Brunn and Capitani, {G. P.} and Chiang, {H. C.} and G. Ciullo and Court, {G. R.} and Dalpiaz, {P. F.} and {De Leo}, R. and {De Nardo}, L. and {De Sanctis}, E. and E. Devitsin and {Di Nezza}, P. and M. D{\"u}ren and M. Ehrenfried and A. Elalaoui-Moulay and G. Elbakian and F. Ellinghaus and U. Elschenbroich and J. Ely and R. Fabbri and A. Fantoni and A. Fechtchenko and L. Felawka and H. Fischer and B. Fox and J. Franz and S. Frullani and Y. G{\"a}rber and G. Gapienko and V. Gapienko and F. Garibaldi and E. Garutti and G. Gavrilov and V. Gharibyan and G. Graw and O. Grebeniouk and Green, {P. W.} and Greeniaus, {L. G.} and A. Gute and W. Haeberli and K. Hafidi and M. Hartig and D. Hasch and D. Heesbeen and Heinsius, {F. H.} and M. Henoch and R. Hertenberger and Hesselink, {W. H.A.} and A. Hillenbrand and Y. Holler and B. Hommez and G. Iarygin and A. Izotov and Jackson, {H. E.} and A. Jgoun and R. Kaiser and E. Kinney and A. Kisselev and P. Kitching and K. K{\"o}nigsmann and H. Kolster and M. Kopytin and V. Korotkov and E. Kotik and V. Kozlov and B. Krauss and Krivokhijine, {V. G.} and L. Lagamba and L. Lapik{\'a}s and A. Laziev and P. Lenisa and P. Liebing and T. Lindemann and K. Lipka and W. Lorenzon and Makins, {N. C.R.} and H. Marukyan and F. Masoli and F. Menden and V. Mexner and N. Meyners and O. Mikloukho and Miller, {C. A.} and Y. Miyachi and V. Muccifora and A. Nagaitsev and E. Nappi and Y. Naryshkin and A. Nass and Nowak, {W. D.} and K. Oganessyan and H. Ohsuga and G. Orlandi and S. Podiatchev and S. Potashov and Potterveld, {D. H.} and M. Raithel and D. Reggiani and Reimer, {P. E.} and A. Reischl and Reolon, {A. R.} and K. Rith and G. Rosner and A. Rostomyan and D. Ryckbosch and I. Sanjiev and F. Sato and I. Savin and C. Scarlett and A. Sch{\"a}fer and C. Schill and G. Schnell and Sch{\"u}ler, {K. P.} and A. Schwind and J. Seibert and B. Seitz and R. Shanidze and Shibata, {T. A.} and V. Shutov and Simani, {M. C.} and K. Sinram and M. Stancari and M. Statera and E. Steffens and Steijger, {J. J.M.} and J. Stewart and U. St{\"o}sslein and K. Suetsugu and H. Tanaka and S. Taroian and A. Terkulov and O. Teryaev and S. Tessarin and E. Thomas and A. Tkabladze and M. Tytgat and Urciuoli, {G. M.} and {van der Nat}, P. and {van der Steenhoven}, G. and {van de Vyver}, R. and Vetterli, {M. C.} and V. Vikhrov and Vincter, {M. G.} and J. Visser and M. Vogt and J. Volmer and C. Weiskopf and J. Wendland and J. Wilbert and T. Wise and S. Yen and S. Yoneyama and B. Zihlmann and H. Zohrabian and P. Zupranski",
year = "2003",
month = "2",
day = "1",
doi = "10.1140/epjc/s2002-01118-x",
language = "English",
volume = "26",
pages = "527--538",
journal = "European Physical Journal C",
issn = "1434-6044",
publisher = "Springer New York",
number = "4",

}

TY - JOUR

T1 - The Q2-dependence of the generalised Gerasimov-Drell-Hearn integral for the deuteron, proton and neutron

AU - Airapetian, A.

AU - Akopov, N.

AU - Akopov, Z.

AU - Amarian, M.

AU - Ammosov, V. V.

AU - Aschenauer, E. C.

AU - Avakian, R.

AU - Avetissian, A.

AU - Avetissian, E.

AU - Bailey, P.

AU - Baturin, V.

AU - Baumgarten, C.

AU - Beckmann, M.

AU - Belostotski, S.

AU - Bernreuther, S.

AU - Bianchi, N.

AU - Blok, H. P.

AU - Böttcher, H.

AU - Borissov, A.

AU - Bouhali, Othmane

AU - Bouwhuis, M.

AU - Brack, J.

AU - Brauksiepe, S.

AU - Brüll, A.

AU - Brunn, I.

AU - Capitani, G. P.

AU - Chiang, H. C.

AU - Ciullo, G.

AU - Court, G. R.

AU - Dalpiaz, P. F.

AU - De Leo, R.

AU - De Nardo, L.

AU - De Sanctis, E.

AU - Devitsin, E.

AU - Di Nezza, P.

AU - Düren, M.

AU - Ehrenfried, M.

AU - Elalaoui-Moulay, A.

AU - Elbakian, G.

AU - Ellinghaus, F.

AU - Elschenbroich, U.

AU - Ely, J.

AU - Fabbri, R.

AU - Fantoni, A.

AU - Fechtchenko, A.

AU - Felawka, L.

AU - Fischer, H.

AU - Fox, B.

AU - Franz, J.

AU - Frullani, S.

AU - Gärber, Y.

AU - Gapienko, G.

AU - Gapienko, V.

AU - Garibaldi, F.

AU - Garutti, E.

AU - Gavrilov, G.

AU - Gharibyan, V.

AU - Graw, G.

AU - Grebeniouk, O.

AU - Green, P. W.

AU - Greeniaus, L. G.

AU - Gute, A.

AU - Haeberli, W.

AU - Hafidi, K.

AU - Hartig, M.

AU - Hasch, D.

AU - Heesbeen, D.

AU - Heinsius, F. H.

AU - Henoch, M.

AU - Hertenberger, R.

AU - Hesselink, W. H.A.

AU - Hillenbrand, A.

AU - Holler, Y.

AU - Hommez, B.

AU - Iarygin, G.

AU - Izotov, A.

AU - Jackson, H. E.

AU - Jgoun, A.

AU - Kaiser, R.

AU - Kinney, E.

AU - Kisselev, A.

AU - Kitching, P.

AU - Königsmann, K.

AU - Kolster, H.

AU - Kopytin, M.

AU - Korotkov, V.

AU - Kotik, E.

AU - Kozlov, V.

AU - Krauss, B.

AU - Krivokhijine, V. G.

AU - Lagamba, L.

AU - Lapikás, L.

AU - Laziev, A.

AU - Lenisa, P.

AU - Liebing, P.

AU - Lindemann, T.

AU - Lipka, K.

AU - Lorenzon, W.

AU - Makins, N. C.R.

AU - Marukyan, H.

AU - Masoli, F.

AU - Menden, F.

AU - Mexner, V.

AU - Meyners, N.

AU - Mikloukho, O.

AU - Miller, C. A.

AU - Miyachi, Y.

AU - Muccifora, V.

AU - Nagaitsev, A.

AU - Nappi, E.

AU - Naryshkin, Y.

AU - Nass, A.

AU - Nowak, W. D.

AU - Oganessyan, K.

AU - Ohsuga, H.

AU - Orlandi, G.

AU - Podiatchev, S.

AU - Potashov, S.

AU - Potterveld, D. H.

AU - Raithel, M.

AU - Reggiani, D.

AU - Reimer, P. E.

AU - Reischl, A.

AU - Reolon, A. R.

AU - Rith, K.

AU - Rosner, G.

AU - Rostomyan, A.

AU - Ryckbosch, D.

AU - Sanjiev, I.

AU - Sato, F.

AU - Savin, I.

AU - Scarlett, C.

AU - Schäfer, A.

AU - Schill, C.

AU - Schnell, G.

AU - Schüler, K. P.

AU - Schwind, A.

AU - Seibert, J.

AU - Seitz, B.

AU - Shanidze, R.

AU - Shibata, T. A.

AU - Shutov, V.

AU - Simani, M. C.

AU - Sinram, K.

AU - Stancari, M.

AU - Statera, M.

AU - Steffens, E.

AU - Steijger, J. J.M.

AU - Stewart, J.

AU - Stösslein, U.

AU - Suetsugu, K.

AU - Tanaka, H.

AU - Taroian, S.

AU - Terkulov, A.

AU - Teryaev, O.

AU - Tessarin, S.

AU - Thomas, E.

AU - Tkabladze, A.

AU - Tytgat, M.

AU - Urciuoli, G. M.

AU - van der Nat, P.

AU - van der Steenhoven, G.

AU - van de Vyver, R.

AU - Vetterli, M. C.

AU - Vikhrov, V.

AU - Vincter, M. G.

AU - Visser, J.

AU - Vogt, M.

AU - Volmer, J.

AU - Weiskopf, C.

AU - Wendland, J.

AU - Wilbert, J.

AU - Wise, T.

AU - Yen, S.

AU - Yoneyama, S.

AU - Zihlmann, B.

AU - Zohrabian, H.

AU - Zupranski, P.

PY - 2003/2/1

Y1 - 2003/2/1

N2 - The Gerasimov-Drell-Hearn (GDH) sum rule connects the anomalous contribution to the magnetic moment of the target nucleus with an energy-weighted integral of the difference of the helicity-dependent photoabsorption cross sections. Originally conceived for real photons, the GDH integral can be generalised to the case of photons with virtuality Q2. For spin-1/2 targets such as the nucleon, it then represents the non-perturbative limit of the first moment Γ1 of the spin structure function g1(x, Q2) in deep inelastic scattering (DIS). The data collected by HERMES with a deuterium target are presented together with a re-analysis of previous measurements on the proton. This provides an unprecedented and complete measurement of the generalised GDH integral for photon-virtuality ranging over 1.2 < Q2 < 12.0 GeV2 and for photon-nucleon invariant mass squared W2 ranging over 1 < W2 < 45 GeV2, thus covering simultaneously the nucleon-resonance and the deep inelastic scattering regions. These data allow the study of the Q2-dependence of the full GDH integral, which is sensitive to both the Q2-evolution of the resonance form factors and contributions of higher twist. The contribution of the nucleon-resonance region is seen to decrease rapidly with increasing Q2. The DIS contribution is sizeable over the full measured range, even down to the lowest measured Q2. As expected, at higher Q2 the data are found to be in agreement with previous measurements of the first moment of g1. From data on the deuteron and proton, the GDH integral for the neutron has been derived and the proton-neutron difference evaluated. This difference is found to satisfy the fundamental Bjorken sum rule at Q2 = 5 GeV2.

AB - The Gerasimov-Drell-Hearn (GDH) sum rule connects the anomalous contribution to the magnetic moment of the target nucleus with an energy-weighted integral of the difference of the helicity-dependent photoabsorption cross sections. Originally conceived for real photons, the GDH integral can be generalised to the case of photons with virtuality Q2. For spin-1/2 targets such as the nucleon, it then represents the non-perturbative limit of the first moment Γ1 of the spin structure function g1(x, Q2) in deep inelastic scattering (DIS). The data collected by HERMES with a deuterium target are presented together with a re-analysis of previous measurements on the proton. This provides an unprecedented and complete measurement of the generalised GDH integral for photon-virtuality ranging over 1.2 < Q2 < 12.0 GeV2 and for photon-nucleon invariant mass squared W2 ranging over 1 < W2 < 45 GeV2, thus covering simultaneously the nucleon-resonance and the deep inelastic scattering regions. These data allow the study of the Q2-dependence of the full GDH integral, which is sensitive to both the Q2-evolution of the resonance form factors and contributions of higher twist. The contribution of the nucleon-resonance region is seen to decrease rapidly with increasing Q2. The DIS contribution is sizeable over the full measured range, even down to the lowest measured Q2. As expected, at higher Q2 the data are found to be in agreement with previous measurements of the first moment of g1. From data on the deuteron and proton, the GDH integral for the neutron has been derived and the proton-neutron difference evaluated. This difference is found to satisfy the fundamental Bjorken sum rule at Q2 = 5 GeV2.

UR - http://www.scopus.com/inward/record.url?scp=0037292403&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0037292403&partnerID=8YFLogxK

U2 - 10.1140/epjc/s2002-01118-x

DO - 10.1140/epjc/s2002-01118-x

M3 - Article

AN - SCOPUS:0037292403

VL - 26

SP - 527

EP - 538

JO - European Physical Journal C

JF - European Physical Journal C

SN - 1434-6044

IS - 4

ER -