Measurement of the Beam-Spin Azimuthal Asymmetry Associated with Deeply-Virtual Compton Scattering

A. Airapetian; Н. Акопов; Z. Akopov; M. Amarian; E. C. Aschenauer; H. Avakian; R. Avakian; A. Avetissian; E. Avetissian; P. Bailey; B. Bains; V. Baturin; C. Baumgarten; M. Beckmann; S. Belostotski; S. Bernreuther; N. Bianchi; H. Böttcher; A. Borissov; O. Bouhali; M. Bouwhuis; J. Brack; S. Brauksiepe; W. Brückner; A. Brüll; I. Brunn; H. J. Bulten; G. P. Capitani; P. Chumney; E. Cisbani; G. Ciullo; G.R. Court; P.F. Dalpiaz; R. De Leo; L. De Nardo; E. De Sanctis; D. De Schepper; E. Devitsin; P. K. A. de Witt Huberts; P. Di Nezza; M. Düren; M. Ehrenfried; G. Elbakian; F. Ellinghaus; J. Ely; R. Fabbri; A. Fantoni; A. Fechtchenko; L. Felawka; B. W. Filippone; H. Fischer; B. Fox; J. Franz; S. Frullani; Y. Gärber; F. Garibaldi; E. Garutti; G. Gavrilov; V. Gharibyan; A. Golendukhin; 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; G. Hofman; Y. Holler; R. J. Holt; B. Hommez; G. Iarygin; A. Izotov; H. E. Jackson; A. Jgoun; Peter Jung; R. Kaiser; J. Kanesaka; E. Kinney; A. Kisselev; P. Kitching; Hideaki Kobayashi; N. Koch; K. Königsmann; H. Kolster; В. А. Коротков; E. Kotik; В. Козлов; Bernhard Krauß; V. G. Krivokhijine; G. S. Kyle; L. Lagamba; A. Laziev; P. Lenisa; P. Liebing; T. Lindemann; W. Lorenzon; Axel Maas; N. C. R. Makins; H. Marukyan; F. Masoli; M. McAndrew; K. McIlhany; F. Meißner; F. Menden; N. Meyners; O. Mikloukho; C. A. Miller; R. Milner; V. Muccifora; R. Mussa; А. Нагайцев; E. Nappi; Y. Naryshkin; A. Nass; K. Negodaeva; W.‐D. Nowak; K. Oganessyan; T. G. O’Neill; B. Owen; S. F. Pate; S. Potashov; D. H. Potterveld; M. Raithel; G. Rakness; V. Rappoport; R. Redwine; D. Reggiani; A. R. Reolon; K. Rith; D. Robinson; A. Rostomyan; M. Ruh; D. Ryckbosch; Y. Sakemi; I. Sanjiev; Fuminobu Sato; I. Savin; C. Scarlett; A. Schäfer; C. Schill; Friedrich Schmidt; G. Schnell; K. P. Schüler; A. Schwind; J. Anthony Seibert; B. Seitz; T.-A. Shibata; V. Shutov; M. C. Simani; A. Simon; K. Sinram; E. Steffens; J. J. M. Steijger; J. Stewart; U. Stößlein; K. Suetsugu; S. Taroian; A. Terkulov; S. Tessarin; E. Thomas; B. Tipton; M. Tytgat; G. M. Urciuoli; J. F. J. van den Brand; G. van Steenhoven; R. van Vyver; J. J. van Hunen; M. C. Vetterli; V. Vikhrov; M. G. Vincter; J. Visser; C. Weiskopf; J. Wendland; Jürgen Wilbert; T. Wise; S. Yen; S. Yoneyama; H. Zohrabian

doi:10.1103/physrevlett.87.182001

Measurement of the Beam-Spin Azimuthal Asymmetry Associated with Deeply-Virtual Compton Scattering

A. Airapetian(A. Alikhanyan National Laboratory), Н. Акопов(A. Alikhanyan National Laboratory), Z. Akopov(A. Alikhanyan National Laboratory), M. Amarian(A. Alikhanyan National Laboratory), E. C. Aschenauer, H. Avakian(Istituto Nazionale di Fisica Nucleare), R. Avakian(A. Alikhanyan National Laboratory), A. Avetissian(A. Alikhanyan National Laboratory), E. Avetissian(A. Alikhanyan National Laboratory), P. Bailey(University of Illinois Urbana-Champaign), B. Bains(University of Illinois Urbana-Champaign), V. Baturin(Petersburg Nuclear Physics Institute), C. Baumgarten(Technical University of Munich), M. Beckmann(University of Freiburg), S. Belostotski(Petersburg Nuclear Physics Institute), S. Bernreuther(Tokyo Institute of Technology), N. Bianchi(Istituto Nazionale di Fisica Nucleare), H. Böttcher, A. Borissov(University of Michigan), O. Bouhali(National Institute for Subatomic Physics), M. Bouwhuis(University of Illinois Urbana-Champaign), J. Brack(University of Colorado Boulder), S. Brauksiepe(University of Freiburg), W. Brückner(Max Planck Institute for Nuclear Physics), A. Brüll(Massachusetts Institute of Technology), I. Brunn(Friedrich-Alexander-Universität Erlangen-Nürnberg), H. J. Bulten(National Institute for Subatomic Physics), G. P. Capitani(Istituto Nazionale di Fisica Nucleare), P. Chumney(New Mexico State University), E. Cisbani(Istituto Nazionale di Fisica Nucleare), G. Ciullo(Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara), G.R. Court(University of Liverpool), P.F. Dalpiaz(Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara), R. De Leo(Istituto Nazionale di Fisica Nucleare, Sezione di Bari), L. De Nardo(University of Alberta), E. De Sanctis(Istituto Nazionale di Fisica Nucleare), D. De Schepper(Argonne National Laboratory), E. Devitsin(P.N. Lebedev Physical Institute of the Russian Academy of Sciences), P. K. A. de Witt Huberts(National Institute for Subatomic Physics), P. Di Nezza(Istituto Nazionale di Fisica Nucleare), M. Düren(Friedrich-Alexander-Universität Erlangen-Nürnberg), M. Ehrenfried, G. Elbakian(A. Alikhanyan National Laboratory), F. Ellinghaus, J. Ely(University of Colorado Boulder), R. Fabbri(Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara), A. Fantoni(Istituto Nazionale di Fisica Nucleare), A. Fechtchenko(Joint Institute for Nuclear Research), L. Felawka(TRIUMF), B. W. Filippone(California Institute of Technology), H. Fischer(University of Freiburg), B. Fox(University of Colorado Boulder), J. Franz(University of Freiburg), S. Frullani(Istituto Nazionale di Fisica Nucleare), Y. Gärber(Friedrich-Alexander-Universität Erlangen-Nürnberg), F. Garibaldi(Istituto Nazionale di Fisica Nucleare), E. Garutti(National Institute for Subatomic Physics), G. Gavrilov(Petersburg Nuclear Physics Institute), V. Gharibyan(A. Alikhanyan National Laboratory), A. Golendukhin(A. Alikhanyan National Laboratory), G. Graw(Technical University of Munich), O. Grebeniouk(Petersburg Nuclear Physics Institute), P. W. Green(TRIUMF), L. G. Greeniaus(TRIUMF), A. Gute(Friedrich-Alexander-Universität Erlangen-Nürnberg), W. Haeberli(University of Wisconsin–Madison), K. Hafidi(Argonne National Laboratory), M. Hartig(TRIUMF), D. Hasch(Istituto Nazionale di Fisica Nucleare), D. Heesbeen(National Institute for Subatomic Physics), F. H. Heinsius(University of Freiburg), M. Henoch(Friedrich-Alexander-Universität Erlangen-Nürnberg), R. Hertenberger(Technical University of Munich), W.H.A. Hesselink(National Institute for Subatomic Physics), G. Hofman(University of Colorado Boulder), Y. Holler(Deutsches Elektronen-Synchrotron DESY), R. J. Holt(University of Illinois Urbana-Champaign), B. Hommez(Ghent University), G. Iarygin(Joint Institute for Nuclear Research), A. Izotov(Petersburg Nuclear Physics Institute), H. E. Jackson(Argonne National Laboratory), A. Jgoun(Petersburg Nuclear Physics Institute), Peter Jung, R. Kaiser, J. Kanesaka(Tokyo Institute of Technology), E. Kinney(University of Colorado Boulder), A. Kisselev(Argonne National Laboratory), P. Kitching(University of Alberta), Hideaki Kobayashi(Tokyo Institute of Technology), N. Koch(Friedrich-Alexander-Universität Erlangen-Nürnberg), K. Königsmann(University of Freiburg), H. Kolster(National Institute for Subatomic Physics), В. А. Коротков, E. Kotik(University of Alberta), В. Козлов(P.N. Lebedev Physical Institute of the Russian Academy of Sciences), Bernhard Krauß(Friedrich-Alexander-Universität Erlangen-Nürnberg), V. G. Krivokhijine(Joint Institute for Nuclear Research), G. S. Kyle(New Mexico State University), L. Lagamba(Istituto Nazionale di Fisica Nucleare, Sezione di Bari), A. Laziev(National Institute for Subatomic Physics), P. Lenisa(Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara), P. Liebing, T. Lindemann(Deutsches Elektronen-Synchrotron DESY), W. Lorenzon(University of Michigan), Axel Maas, N. C. R. Makins(University of Illinois Urbana-Champaign), H. Marukyan(A. Alikhanyan National Laboratory), F. Masoli(Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara), M. McAndrew(University of Liverpool), K. McIlhany(California Institute of Technology), F. Meißner(Friedrich-Alexander-Universität Erlangen-Nürnberg), F. Menden(University of Freiburg), N. Meyners(Deutsches Elektronen-Synchrotron DESY), O. Mikloukho(Petersburg Nuclear Physics Institute), C. A. Miller(TRIUMF), R. Milner(Massachusetts Institute of Technology), V. Muccifora(Istituto Nazionale di Fisica Nucleare), R. Mussa(Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara), А. Нагайцев(Joint Institute for Nuclear Research), E. Nappi(Istituto Nazionale di Fisica Nucleare, Sezione di Bari), Y. Naryshkin(Petersburg Nuclear Physics Institute), A. Nass(Friedrich-Alexander-Universität Erlangen-Nürnberg), K. Negodaeva, W.‐D. Nowak, K. Oganessyan(Istituto Nazionale di Fisica Nucleare), T. G. O’Neill(Argonne National Laboratory), B. Owen(University of Illinois Urbana-Champaign), S. F. Pate(New Mexico State University), S. Potashov(P.N. Lebedev Physical Institute of the Russian Academy of Sciences), D. H. Potterveld(Argonne National Laboratory), M. Raithel(Friedrich-Alexander-Universität Erlangen-Nürnberg), G. Rakness(University of Colorado Boulder), V. Rappoport(Petersburg Nuclear Physics Institute), R. Redwine(Massachusetts Institute of Technology), D. Reggiani(Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara), A. R. Reolon(Istituto Nazionale di Fisica Nucleare), K. Rith(Friedrich-Alexander-Universität Erlangen-Nürnberg), D. Robinson(University of Illinois Urbana-Champaign), A. Rostomyan(A. Alikhanyan National Laboratory), M. Ruh(University of Freiburg), D. Ryckbosch(Ghent University), Y. Sakemi(Tokyo Institute of Technology), I. Sanjiev(Argonne National Laboratory), Fuminobu Sato(Tokyo Institute of Technology), I. Savin(Joint Institute for Nuclear Research), C. Scarlett(University of Michigan), A. Schäfer(University of Regensburg), C. Schill(University of Freiburg), Friedrich Schmidt(Friedrich-Alexander-Universität Erlangen-Nürnberg), G. Schnell(New Mexico State University), K. P. Schüler(Deutsches Elektronen-Synchrotron DESY), A. Schwind, J. Anthony Seibert(University of Freiburg), B. Seitz(University of Alberta), T.-A. Shibata(Tokyo Institute of Technology), V. Shutov(Joint Institute for Nuclear Research), M. C. Simani(National Institute for Subatomic Physics), A. Simon(University of Freiburg), K. Sinram(Deutsches Elektronen-Synchrotron DESY), E. Steffens(Friedrich-Alexander-Universität Erlangen-Nürnberg), J. J. M. Steijger(National Institute for Subatomic Physics), J. Stewart(Argonne National Laboratory), U. Stößlein(University of Colorado Boulder), K. Suetsugu(Tokyo Institute of Technology), S. Taroian(A. Alikhanyan National Laboratory), A. Terkulov(P.N. Lebedev Physical Institute of the Russian Academy of Sciences), S. Tessarin(Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara), E. Thomas(Istituto Nazionale di Fisica Nucleare), B. Tipton(California Institute of Technology), M. Tytgat(Ghent University), G. M. Urciuoli(Istituto Nazionale di Fisica Nucleare), J. F. J. van den Brand(National Institute for Subatomic Physics), G. van Steenhoven(National Institute for Subatomic Physics), R. van Vyver(Ghent University), J. J. van Hunen(National Institute for Subatomic Physics), M. C. Vetterli(TRIUMF), V. Vikhrov(Petersburg Nuclear Physics Institute), M. G. Vincter(University of Alberta), J. Visser(National Institute for Subatomic Physics), C. Weiskopf(Friedrich-Alexander-Universität Erlangen-Nürnberg), J. Wendland(TRIUMF), Jürgen Wilbert(Friedrich-Alexander-Universität Erlangen-Nürnberg), T. Wise(University of Wisconsin–Madison), S. Yen(TRIUMF), S. Yoneyama(Tokyo Institute of Technology), H. Zohrabian(A. Alikhanyan National Laboratory)

Physical Review Letters

October 10, 2001

10.1103/physrevlett.87.182001

Cited by 312Open Access

Full Text

Abstract

The beam-spin asymmetry in hard electroproduction of photons has been measured. The data have been accumulated by the HERMES experiment at DESY using the HERA 27.6 GeV longitudinally polarized positron beam and an unpolarized hydrogen-gas target. The asymmetry in the azimuthal distribution of the produced photons in the angle $\ensuremath{\varphi}$ relative to the lepton scattering plane was determined with respect to the helicity state of the incoming positron beam. The beam-spin analyzing power in the $\mathrm{sin}\ensuremath{\varphi}$ moment was measured to be $\ensuremath{-}0.23\ifmmode\pm\else\textpm\fi{}0.04(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.03(\mathrm{syst})$ in the missing-mass range below 1.7 GeV. The observed asymmetry is attributed to the interference of the Bethe-Heitler and deeply virtual Compton scattering processes.

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