Hard exclusive electroproduction of π+π− pairs
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Hard exclusive electroproduction of π+π− pairs

A. Airapetian,N. Akopov,Z. Akopov,M. Amarian,V.V. Ammosov,A. Andrus,E.C. Aschenauer,W. Augustyniak,R. Avakian,A. Avetissian,P. Bailey,D. Balin,V. Baturin,M. Beckmann,S. Belostotski,S. Bernreuther,N. Bianchi,H.P. Blok,H. Böttcher,A. Borissov,A. Borysenko,M. Bouwhuis,J. Brack,A. Brüll,V. Bryzgalov,G.P. Capitani,T. Chen,G. Ciullo,M. Contalbrigo,P.F. Dalpiaz,R. De Leo,M. Demey,L. De Nardo,E. De Sanctis,E. Devitsin,Pasquale Di Nezza,M. Düren,M. Ehrenfried,A. Elalaoui-Moulay,G. Elbakian,F. Ellinghaus,U. Elschenbroich,R. Fabbri,A. Fantoni,A. Fechtchenko,L. Felawka,S. Frullani,G. Gapienko,F. Garibaldi,K. Garrow,E. Garutti,G. Gavrilov,V. Gharibyan,G. Graw,O. Grebeniouk,L.G. Greeniaus,I.M. Gregor,K.A. Griffioen,K. Hafidi,M. Hartig,D. Hasch,D. Heesbeen,M. Henoch,R. Hertenberger,W.H.A. Hesselink,A. Hillenbrand,M. Hoek,Y. Holler,B. Hommez,G. Iarygin,A. Ivanilov,A. Izotov,H.E. Jackson,A. Jgoun,R. Kaiser,E. Kinney,A. Kisselev,M. Kopytin,V. Korotkov,V. Kozlov,B. Krauss,V.G. Krivokhijine,L. Lagamba,L. Lapikás,A. Laziev,P. Lenisa,P. Liebing,L.A. Linden-Levy,K. Lipka,W. Lorenzon,H. Lu,J. Lu,S. Lu,B.-Q. Ma,B. Maiheu,N.C.R. Makins,Y. Mao,B. Marianski,H. Marukyan,F. Masoli,V. Mexner,N. Meyners,O. Mikloukho,C.A. Miller,Y. Miyachi,V. Muccifora,A. Nagaitsev,E. Nappi,Y. Naryshkin,A. Nass,M. Negodaev,W.-D. Nowak,K. Oganessyan,H. Ohsuga,A. Osborne,N. Pickert,S. Potashov,D.H. Potterveld,M. Raithel,D. Reggiani,P.E. Reimer,A. Reischl,A.R. Reolon,C. Riedl,K. Rith,G. Rosner,Armine Rostomyan,L. Rubacek,J. Rubin,D. Ryckbosch,Y. Salomatin,I. Sanjiev,I. Savin,A. Schäfer,C. Schill,G. Schnell,K.P. Schüler,J. Seele,R. Seidl,B. Seitz,R. Shanidze,C. Shearer,T.-A. Shibata,V. Shutov,K. Sinram,W. Sommer,M. Stancari,M. Statera,E. Steffens,J.J.M. Steijger,H. Stenzel,J. Stewart,F. Stinzing,P. Tait,H. Tanaka,S. Taroian,B. Tchuiko,A. Terkulov,A. Tkabladze,A. Trzcinski,M. Tytgat,A. Vandenbroucke,P. Van Der Nat,G. Van Der Steenhoven,Y. Van Haarlem,M.C. Vetterli,V. Vikhrov,M.G. Vincter,C. Vogel,M. Vogt,J. Volmer,C. Weiskopf,J. Wendland,J. Wilbert,G. Ybeles Smit,Y. Ye,Z. Ye,S. Yen,B. Zihlmann,P. Zupranski,E. Avetissian,V. Gapienko,HERMES collaboration;A. Airapetian;N. Akopov;Z. Akopov;M. Amarian;V.V. Ammosov;A. Andrus;E.C. Aschenauer;W. Augustyniak;R. Avakian;A. Avetissian;P. Bailey;D. Balin;V. Baturin;M. Beckmann;S. Belostotski;S. Bernreuther;N. Bianchi;H.P. Blok;H. Böttcher;A. Borissov;A. Borysenko;M. Bouwhuis;J. Brack;A. Brüll;V. Bryzgalov;G.P. Capitani;T. Chen;G. Ciullo;M. Contalbrigo;P.F. Dalpiaz;R. De Leo;M. Demey;L. De Nardo;E. De Sanctis;E. Devitsin;Pasquale Di Nezza;M. Düren;M. Ehrenfried;A. Elalaoui-Moulay;G. Elbakian;F. Ellinghaus;U. Elschenbroich;R. Fabbri;A. Fantoni;A. Fechtchenko;L. Felawka;S. Frullani;G. Gapienko;F. Garibaldi;K. Garrow;E. Garutti;G. Gavrilov;V. Gharibyan;G. Graw;O. Grebeniouk;L.G. Greeniaus;I.M. Gregor;K.A. Griffioen;K. Hafidi;M. Hartig;D. Hasch;D. Heesbeen;M. Henoch;R. Hertenberger;W.H.A. Hesselink;A. Hillenbrand;M. Hoek;Y. Holler;B. Hommez;G. Iarygin;A. Ivanilov;A. Izotov;H.E. Jackson;A. Jgoun;R. Kaiser;E. Kinney;A. Kisselev;M. Kopytin;V. Korotkov;V. Kozlov;B. Krauss;V.G. Krivokhijine;L. Lagamba;L. Lapikás;A. Laziev;P. Lenisa;P. Liebing;L.A. Linden-Levy;K. Lipka;W. Lorenzon;H. Lu;J. Lu;S. Lu;B.-Q. Ma;B. Maiheu;N.C.R. Makins;Y. Mao;B. Marianski;H. Marukyan;F. Masoli;V. Mexner;N. Meyners;O. Mikloukho;C.A. Miller;Y. Miyachi;V. Muccifora;A. Nagaitsev;E. Nappi;Y. Naryshkin;A. Nass;M. Negodaev;W.-D. Nowak;K. Oganessyan;H. Ohsuga;A. Osborne;N. Pickert;S. Potashov;D.H. Potterveld;M. Raithel;D. Reggiani;P.E. Reimer;A. Reischl;A.R. Reolon;C. Riedl;K. Rith;G. Rosner;Armine Rostomyan;L. Rubacek;J. Rubin;D. Ryckbosch;Y. Salomatin;I. Sanjiev;I. Savin;A. Schäfer;C. Schill;G. Schnell;K.P. Schüler;J. Seele;R. Seidl;B. Seitz;R. Shanidze;C. Shearer;T.-A. Shibata;V. Shutov;K. Sinram;W. Sommer;M. Stancari;M. Statera;E. Steffens;J.J.M. Steijger;H. Stenzel;J. Stewart;F. Stinzing;P. Tait;H. Tanaka;S. Taroian;B. Tchuiko;A. Terkulov;A. Tkabladze;A. Trzcinski;M. Tytgat;A. Vandenbroucke;P. Van Der Nat;G. Van Der Steenhoven;Y. Van Haarlem;M.C. Vetterli;V. Vikhrov;M.G. Vincter;C. Vogel;M. Vogt;J. Volmer;C. Weiskopf;J. Wendland;J. Wilbert;G. Ybeles Smit;Y. Ye;Z. Ye;S. Yen;B. Zihlmann;P. Zupranski;E. Avetissian;V. Gapienko;HERMES collaboration;
physics letters b 2004 Vol. 599 pp. 212-222
182
collaboration2004physicshard

Abstract

Hard exclusive electroproduction of π+π− pairs off hydrogen and deuterium targets has been studied by the HERMES experiment at DESY. Legendre moments 〈P1〉 and 〈P3〉 of the angular distributions of π+ mesons in the center-of-mass frame of the pair have been measured for the first time. Their dependence on the π+π− invariant mass can be understood as being due to the interference between relative P-wave (isovector) and S-, D-wave (isoscalar) states of the two pions. The increase in magnitude of 〈P1〉 as Bjorken x increases is interpreted in the framework of generalized parton distributions as an enhancement of flavour non-singlet qq¯ exchange for larger values of x, which leads to a sizable admixture of isoscalar and isovector pion pairs. In addition, the interference between P-wave and D-wave states separately for transverse and longitudinal pion pairs has been studied. The data indicate that in the f2(1270) region at 〈Q2〉=3GeV2 higher-twist effects can be as large as the leading-twist longitudinal component.

Keywords

wave isovector isoscalar pion pairs exclusive hard twist electroproduction

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DOI:
10.1016/j.physletb.2004.08.059
URL:
https://sciprofiles.com/publication/view/4f513c2af...

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