Single-spin azimuthal asymmetry in exclusive electroproduction of π+ mesons

A. Airapetian,N. Akopov,Z. Akopov,M. Amarian,E.C. Aschenauer,H. Avakian,A. Avetissian,P. Bailey,V. Baturin,C. Baumgarten,M. Beckmann,S. Belostotski,S. Bernreuther,N. Bianchi,H. Böttcher,A. Borissov,O. Bouhali,M. Bouwhuis,J. Brack,S. Brauksiepe,A. Brüll,I. Brunn,H.J. Bulten,G.P. Capitani,P. Chumney,Evaristo 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,Pasquale Di Nezza,M. Düren,M. Ehrenfried,G. Elbakian,Frank 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,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,P. Jung,R. Kaiser,A. Kisselev,P. Kitching,K. Königsmann,H. Kolster,V. Korotkov,E. Kotik,V. Kozlov,B. Krauss,V.G. Krivokhijine,G. Kyle,Luigi Lagamba,A. Laziev,P. Lenisa,P. Liebing,T. Lindemann,W. Lorenzon,A. Maas,N.C.R. Makins,H. Marukyan,F. Masoli,K. McIlhany,F. Meissner,F. Menden,V. Mexner,N. Meyners,O. Mikloukho,R. Milner,V. Muccifora,A. Nagaitsev,E. Nappi,Y. Naryshkin,A. Nass,K. Negodaeva,W.-D. Nowak,K. Oganessyan,T.G. O'Neill,B.R. Owen,S.F. Pate,S. Podiatchev,S. Potashov,D.H. Potterveld,M. Raithel,G. Rakness,V. Rappoport,R. Redwine,D. Reggiani,P. Reimer,A.R. Reolon,K. Rith,D. Robinson,A. Rostomyan,D. Ryckbosch,Y. Sakemi,I. Sanjiev,F. Sato,I. Savin,C. Scarlett,A. Schäfer,C. Schill,F. Schmidt,G. Schnell,K.P. Schüler,A. Schwind,J. 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,Johannes Van Den Brand,Gerard van der Steenhoven,R. van de Vyver,Michel Vetterli,V. Vikhrov,Manuella Vincter,J. Visser,J. Volmer,C. Weiskopf,J. Wendland,J. Wilbert,T. Wise,S. Yen,S. Yoneyama,H. Zohrabian; A. Airapetian; N. Akopov; Z. Akopov; M. Amarian; E.C. Aschenauer; H. Avakian; A. Avetissian; P. Bailey; V. Baturin; C. Baumgarten; M. Beckmann; S. Belostotski; S. Bernreuther; N. Bianchi; H. Böttcher; A. Borissov; O. Bouhali; M. Bouwhuis; J. Brack; S. Brauksiepe; A. Brüll; I. Brunn; H.J. Bulten; G.P. Capitani; P. Chumney; Evaristo 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; Pasquale Di Nezza; M. Düren; M. Ehrenfried; G. Elbakian; Frank 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; 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; P. Jung; R. Kaiser; A. Kisselev; P. Kitching; K. Königsmann; H. Kolster; V. Korotkov; E. Kotik; V. Kozlov; B. Krauss; V.G. Krivokhijine; G. Kyle; Luigi Lagamba; A. Laziev; P. Lenisa; P. Liebing; T. Lindemann; W. Lorenzon; A. Maas; N.C.R. Makins; H. Marukyan; F. Masoli; K. McIlhany; F. Meissner; F. Menden; V. Mexner; N. Meyners; O. Mikloukho; R. Milner; V. Muccifora; A. Nagaitsev; E. Nappi; Y. Naryshkin; A. Nass; K. Negodaeva; W.-D. Nowak; K. Oganessyan; T.G. O'Neill; B.R. Owen; S.F. Pate; S. Podiatchev; S. Potashov; D.H. Potterveld; M. Raithel; G. Rakness; V. Rappoport; R. Redwine; D. Reggiani; P. Reimer; A.R. Reolon; K. Rith; D. Robinson; A. Rostomyan; D. Ryckbosch; Y. Sakemi; I. Sanjiev; F. Sato; I. Savin; C. Scarlett; A. Schäfer; C. Schill; F. Schmidt; G. Schnell; K.P. Schüler; A. Schwind; J. 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; Johannes Van Den Brand; Gerard van der Steenhoven; R. van de Vyver; Michel Vetterli; V. Vikhrov; Manuella Vincter; J. Visser; J. Volmer; C. Weiskopf; J. Wendland; J. Wilbert; T. Wise; S. Yen; S. Yoneyama; H. Zohrabian

Single-spin azimuthal asymmetry in exclusive electroproduction of π+ mesons

A. Airapetian,N. Akopov,Z. Akopov,M. Amarian,E.C. Aschenauer,H. Avakian,A. Avetissian,P. Bailey,V. Baturin,C. Baumgarten,M. Beckmann,S. Belostotski,S. Bernreuther,N. Bianchi,H. Böttcher,A. Borissov,O. Bouhali,M. Bouwhuis,J. Brack,S. Brauksiepe,A. Brüll,I. Brunn,H.J. Bulten,G.P. Capitani,P. Chumney,Evaristo 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,Pasquale Di Nezza,M. Düren,M. Ehrenfried,G. Elbakian,Frank 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,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,P. Jung,R. Kaiser,A. Kisselev,P. Kitching,K. Königsmann,H. Kolster,V. Korotkov,E. Kotik,V. Kozlov,B. Krauss,V.G. Krivokhijine,G. Kyle,Luigi Lagamba,A. Laziev,P. Lenisa,P. Liebing,T. Lindemann,W. Lorenzon,A. Maas,N.C.R. Makins,H. Marukyan,F. Masoli,K. McIlhany,F. Meissner,F. Menden,V. Mexner,N. Meyners,O. Mikloukho,R. Milner,V. Muccifora,A. Nagaitsev,E. Nappi,Y. Naryshkin,A. Nass,K. Negodaeva,W.-D. Nowak,K. Oganessyan,T.G. O'Neill,B.R. Owen,S.F. Pate,S. Podiatchev,S. Potashov,D.H. Potterveld,M. Raithel,G. Rakness,V. Rappoport,R. Redwine,D. Reggiani,P. Reimer,A.R. Reolon,K. Rith,D. Robinson,A. Rostomyan,D. Ryckbosch,Y. Sakemi,I. Sanjiev,F. Sato,I. Savin,C. Scarlett,A. Schäfer,C. Schill,F. Schmidt,G. Schnell,K.P. Schüler,A. Schwind,J. 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,Johannes Van Den Brand,Gerard van der Steenhoven,R. van de Vyver,Michel Vetterli,V. Vikhrov,Manuella Vincter,J. Visser,J. Volmer,C. Weiskopf,J. Wendland,J. Wilbert,T. Wise,S. Yen,S. Yoneyama,H. Zohrabian;A. Airapetian;N. Akopov;Z. Akopov;M. Amarian;E.C. Aschenauer;H. Avakian;A. Avetissian;P. Bailey;V. Baturin;C. Baumgarten;M. Beckmann;S. Belostotski;S. Bernreuther;N. Bianchi;H. Böttcher;A. Borissov;O. Bouhali;M. Bouwhuis;J. Brack;S. Brauksiepe;A. Brüll;I. Brunn;H.J. Bulten;G.P. Capitani;P. Chumney;Evaristo 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;Pasquale Di Nezza;M. Düren;M. Ehrenfried;G. Elbakian;Frank 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;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;P. Jung;R. Kaiser;A. Kisselev;P. Kitching;K. Königsmann;H. Kolster;V. Korotkov;E. Kotik;V. Kozlov;B. Krauss;V.G. Krivokhijine;G. Kyle;Luigi Lagamba;A. Laziev;P. Lenisa;P. Liebing;T. Lindemann;W. Lorenzon;A. Maas;N.C.R. Makins;H. Marukyan;F. Masoli;K. McIlhany;F. Meissner;F. Menden;V. Mexner;N. Meyners;O. Mikloukho;R. Milner;V. Muccifora;A. Nagaitsev;E. Nappi;Y. Naryshkin;A. Nass;K. Negodaeva;W.-D. Nowak;K. Oganessyan;T.G. O'Neill;B.R. Owen;S.F. Pate;S. Podiatchev;S. Potashov;D.H. Potterveld;M. Raithel;G. Rakness;V. Rappoport;R. Redwine;D. Reggiani;P. Reimer;A.R. Reolon;K. Rith;D. Robinson;A. Rostomyan;D. Ryckbosch;Y. Sakemi;I. Sanjiev;F. Sato;I. Savin;C. Scarlett;A. Schäfer;C. Schill;F. Schmidt;G. Schnell;K.P. Schüler;A. Schwind;J. 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;Johannes Van Den Brand;Gerard van der Steenhoven;R. van de Vyver;Michel Vetterli;V. Vikhrov;Manuella Vincter;J. Visser;J. Volmer;C. Weiskopf;J. Wendland;J. Wilbert;T. Wise;S. Yen;S. Yoneyama;H. Zohrabian;

physics letters b 2002 Vol. 535 pp. 85-92

161

zohrabian2002physicssingle-spin

Abstract

A single-spin asymmetry in the distribution of exclusively produced π+ mesons azimuthally around the virtual photon direction relative to the lepton scattering plane has been measured for the first time in deep-inelastic scattering of positrons off longitudinally polarized protons. Integrated over the experimental acceptance, the sinφ moment of the polarization asymmetry of the cross section is measured to be −0.18±0.05(stat.)±0.02(syst.). The asymmetry is also studied as a function of the relevant kinematic variables, and its magnitude is found to grow with decreasing x and increasing −t and vanish at t→tmin (where x is the Bjorken scaling variable and t is the squared four-momentum transferred to the nucleon).

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polarization asymmetry experimental spin scattering kinematic mesons plane azimuthal

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10.1016/s0370-2693(02)01780-x

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Single-spin azimuthal asymmetry in exclusive electroproduction of π+ mesons

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