Measurement of the polarized structure functionσLT'for pion electroproduction in the Roper-resonance region

K. S. Joo,L. C. Smith,I.G. Aznauryan,Volker Burkert,H. Egiyan, R. Minehart,G. S. Adams, P. Ambrozewicz, E. Anciant,M. Anghinolfi, B. Asavapibhop,G. Asryan,G. Audit,T. Auger,H. Avakian,H. Bagdasaryan, N. Baillie,J. Ball, N. A. Baltzell,S. Barrow,V. Batourine,M. Battaglieri,K. Beard,I. Bedlinskiy,M. Bektasoglu,M. Bellis,N. Benmouna,B. L. Berman,N. Bianchi,A. S. Biselli, B. E. Bonner,S. Bouchigny,S. Boiarinov,R. Bradford,D. Branford,W. J. Briscoe,W. K. Brooks,S. Bueltmann,C. Butuceanu, J. R. Calarco,S. L. Careccia,D. S. Carman,B. Carnahan, C. Cetina,S. Chen,P. L. Cole, Alan Coleman, P. Coltharp, D. Cords, P. Corvisiero, D. Crabb, J. P. Cummings,E. De Sanctis, R. DeVita,P. V. Degtyarenko,L. Dennis,A. Deur,K. V. Dharmawardane,K. S. Dhuga,C. Djalali, G. E. Dodge,J. Donnelly,D. Doughty,P. Dragovitsch,M. Dugger,S. Dytman,O. P. Dzyubak,K. S. Egiyan, L. Elouadrhiri, A. Empl,P. Eugenio,L. Farhi, R. Fatemi, G. Fedotov,G. Feldman,R. J. Feuerbach,T. A. Forest,V. V. Frolov, H. O. Funsten,S. J. Gaff, M. Garçon,G. Gavalian,G. P. Gilfoyle, K. L. Giovanetti,Pascal Girard, F. X. Girod,J. T. Goetz,R. W. Gothe,K. A. Griffioen,M. Guidal,M. Guillo,N. Guler,L. Guo, V. Gyurjyan, R. Hakobyan,J. Hardie,D. Heddle, F. W. Hersman, K. Hicks,I. Hleiqawi,M. Holtrop, J. F. Hu, C. E. Hyde‐Wright,Y. Ilieva,D. G. Ireland,Б. С. Ишханов,M. M. Ito,D. Jenkins,H. S. Jo,H. G. Juengst,J. H. Kelley,J. D. Kellie, M. Khandaker,K. Y. Kim,K. Kim, W. Kim,A. Klein,F. J. Klein,A. V. Klimenko, M. Klusman, M. Kossov,L. H. Kramer,V. Kubarovsky,J. Kühn,S. E. Kuhn,J. Lachniet,J. M. Laget,J. Langheinrich,D. Lawrence,T. Lee, K. Livingston, K. Lukashin, J. J. Manak,Claude Marchand, L. C. Maximon,S. McAleer,B. McKinnon,J. W. C. McNabb,B. A. Mecking, M. D. Mestayer,C. A. Meyer,K. Mikhailov,M. Mirazita, R. Miskimen,V. Mokeev,S. A. Morrow, V. Muccifora,J. Muêller, G. S. Mutchler,P. Nadel‐Turonski,J. Napolitano,R. Nasseripour,S. O. Nelson,S. Niccolai,G. Niculescu,I. Niculescu,B. B. Niczyporuk, R. A. Niyazov, M. Nozar, G. V. O’Rielly,M. Osipenko, A. I. Ostrovidov,K. Park,E. Pasyuk,G. A. Peterson,S. A. Philips, J. Pierce, N. Pivnyuk, D. Počanić,O. Pogorelko,E. Polli,S. Pozdniakov,B. M. Preedom,J. W. Price,Y. Prok,D. Protopopescu, L. M. Qin,B. A. Raue,G. Riccardi,G. Ricco, M. Ripani,Barry Ritchie,F. Ronchetti,G. Rosner,P. Rossi, D. Rowntree, P. D. Rubin,F. Sabatié, K. Sabourov,C. Salgado, J. P. Santoro,V. Sapunenko,R. A. Schumacher, V. S. Serov,A. Shafi,Y. G. Sharabian,J. Shaw, S. Simionatto, A. V. Skabelin,E. S. Smith, D. I. Sober, M. Spraker,A. Stavinsky,S. Stepanyan,S. Stepanyan,B. E. Stokes, P. Stoler, I. I. Strakovsky,S. Strauch, M. Taiuti,S. Taylor, D. J. Tedeschi,U. Thoma,R. Thompson,A. Tkabladze,C. Tur,M. Ungaro,M. F. Vineyard, A. V. Vlassov, K. Wang,Larry Weinstein,H.R. Weller,D. P. Weygand,M. Williams,E. Wolin, M. H. Wood, A. Yegneswaran, Jaeseok Yun,L. Zana,J. Zhang

Physical Review C(2005)

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摘要
The polarized longitudinal-transverse structure function $\sigma_{LT^\prime}$ measures the interference between real and imaginary amplitudes in pion electroproduction and can be used to probe the coupling between resonant and non-resonant processes. We report new measurements of $\sigma_{LT^\prime}$ in the $N(1440){1/2}^+$ (Roper) resonance region at $Q^2=0.40$ and 0.65 GeV$^2$ for both the $\pi^0 p$ and $\pi^+ n$ channels. The experiment was performed at Jefferson Lab with the CEBAF Large Acceptance Spectrometer (CLAS) using longitudinally polarized electrons at a beam energy of 1.515 GeV. Complete angular distributions were obtained and are compared to recent phenomenological models. The $\sigma_{LT^\prime}(\pi^+ n)$ channel shows a large sensitivity to the Roper resonance multipoles $M_{1-}$ and $S_{1-}$ and provides new constraints on models of resonance formation.
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pion electroproduction,roper-resonance
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