Hard Exclusive Pion Electroproduction at Backward Angles with CLAS
K. Park,M. Guidal,R. W. Gothe,B. Pire,K. Semenov-Tian-Shansky,J. -M. Laget,K. P. Adhikari,S. Adhikari,Z. Akbar,H. Avakian,J. Ball,I. Balossino,N. A. Baltzell,L. Barion,M. Battaglieri,I. Bedlinskiy,A. S. Biselli,W. J. Briscoe,W. K. Brooks,V. D. Burkert,F. T. Cao,D. S. Carman,A. Celentano,G. Charles,T. Chetry,G. Ciullo,L. Clark,P. L. Cole,M. Contalbrigo,V. Crede,A. D'Angelo,N. Dashyan,R. De Vita,E. De Sanctis,M. Defurne,A. Deur,C. Djalali,R. Dupre,H. Egiyan,A. El Alaoui,L. El Fassi,L. Elouadrhiri,P. Eugenio,G. Fedotov,R. Fersch,A. Filippi,M. Garcon,Y. Ghandilyan,G. P. Gilfoyle,F. X. Girod,E. Golovatch,K. A. Griffioen,L. Guo,K. Hafidi,H. Hakobyan,C. Hanretty,N. Harrison,M. Hattawy,D. Heddle,K. Hicks,M. Holtrop,C. E. Hyde,Y. Ilieva,D. G. Ireland,B. S. Ishkhanov,E. L. Isupov,D. Jenkins,S. Johnston,K. Joo,M. L. Kabir,D. Keller,G. Khachatryan,M. Khachatryan,M. Khandaker,W. Kim,F. J. Klein,V. Kubarovsky,S. E. Kuhn,L. Lanza,K. Livingston,I. J. D. MacGregor,N. Markov,B. McKinnon,M. Mirazita,V. Mokeev,R. A. Montgomery,C. Munoz Camacho,P. Nadel-Turonski,S. Niccolai,G. Niculescu,M. Osipenko,M. Paolone,R. Paremuzyan,E. Pasyuk,W. Phelps,O. Pogorelko,J. Poudel,J. W. Price,Y. Prok,D. Protopopescu,M. Ripani,A. Rizzo,P. Rossi,F. Sabatie,C. Salgado,R. A. Schumacher,Y. Sharabian,Iu Skorodumina,G. D. Smith,D. Sokhan,N. Sparveris,S. Stepanyan,I. I. Strakovsky,S. Strauch,M. Taiuti,J. A. Tan,M. Ungaro,H. Voskanyan,E. Voutier,X. Wei,N. Zachariou,J. Zhang
Physics letters B（2018）
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摘要
We report on the first measurement of cross sections for exclusive deeply virtual pion electroproduction off the proton, ep -> e'n pi(+), above the resonance region at backward pion center-of-mass angles. The phi(pi)*-dependent cross sections were measured, from which we extracted three combinations of structure functions of the proton. Our results are compatible with calculations based on nucleon-to-pion transition distribution amplitudes (TDAs). These non-perturbative objects are defined as matrix elements of three-quark-light-cone-operators and characterize partonic correlations with a particular emphasis on baryon charge distribution inside a nucleon. (C) 2018 The Authors. Published by Elsevier B.V.
