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arXiv · 1604.04350

Target and Beam-Target Spin Asymmetries in Exclusive $\pi^+$ and $\pi^-$ Electroproduction with 1.6 to 5.7 GeV Electrons

P. E. Bosted·A. S. Biselli·S. Careccia·G. Dodge·R. Fersch·S. E. Kuhn·J. Pierce·Y. Prok·X. Zheng·K. P. Adhikari·D. Adikaram·Z. Akbar·M. J. Amaryan·S. Anefalos Pereira·G. Asryan·H. Avakian·R. A. Badui·J. Ball·N. A. Baltzell·M. Battaglieri·V. Batourine·I. Bedlinskiy·S. Boiarinov·W. J. Briscoe·S. Bültmann·V. D. Burkert·T. Cao·D. S. Carman·A. Celentano·S. Chandavar·G. Charles·T. Chetry·G. Ciullo·L. Clark·L. Colaneri·P. L. Cole·M. Contalbrigo·O. Cortes·V. Crede·A. D'Angelo·N. Dashyan·R. De Vita·A. Deur·C. Djalali·R. Dupre·H. Egiyan·A. El Alaoui·L. El Fassi·P. Eugenio·E. Fanchini·G. Fedotov·A. Filippi·J. A. Fleming·T. A. Forest·A. Fradi·M. Garçon·N. Gevorgyan·Y. Ghandilyan·G. P. Gilfoyle·K. L. Giovanetti·F. X. Girod·C. Gleason·W. Gohn·E. Golovatch·R. W. Gothe·K. A. Griffioen·N. Guler·L. Guo·K. Hafidi·C. Hanretty·N. Harrison·M. Hattawy·D. Heddle·K. Hicks·M. Holtrop·S. M. Hughes·Y. Ilieva·D. G. Ireland·B. S. Ishkhanov·E. L. Isupov·D. Jenkins·H. Jiang·H. S. Jo·K. Joo·S. Joosten·D. Keller·M. Khandaker·W. Kim·A. Klein·F. J. Klein·V. Kubarovsky·S. V. Kuleshov·L. Lanza·P. Lenisa·K. Livingston·H. Y. Lu·I . J . D. MacGregor·N. Markov·M. E. McCracken·B. McKinnon
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Abstract

Beam-target double spin asymmetries and target single-spin asymmetries in exclusive $\pi^+$ and $\pi^-$ electroproduction were obtained from scattering of 1.6 to 5.7 GeV longitudinally polarized electrons from longitudinally polarized protons (for $\pi^+$) and deuterons (for $\pi^-$) using the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab. The kinematic range covered is $1.1 1.5$ GeV. Very large target-spin asymmetries are observed for $W>1.6$ GeV. When combined with cross section measurements, the present results will provide powerful constraints on nucleon resonance amplitudes at moderate and large values of $Q^2$, for resonances with masses as high as 2.3 GeV.

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P. E. Bosted, A. S. Biselli, S. Careccia, G. Dodge, R. Fersch, S. E. Kuhn, J. Pierce, Y. Prok, X. Zheng, K. P. Adhikari, D. Adikaram, Z. Akbar, M. J. Amaryan, S. Anefalos Pereira, G. Asryan, H. Avakian, R. A. Badui, J. Ball, N. A. Baltzell, M. Battaglieri, V. Batourine, I. Bedlinskiy, S. Boiarinov, W. J. Briscoe, S. Bültmann, V. D. Burkert, T. Cao, D. S. Carman, A. Celentano, S. Chandavar, G. Charles, T. Chetry, G. Ciullo, L. Clark, L. Colaneri, P. L. Cole, M. Contalbrigo, O. Cortes, V. Crede, A. D'Angelo, N. Dashyan, R. De Vita, A. Deur, C. Djalali, R. Dupre, H. Egiyan, A. El Alaoui, L. El Fassi, P. Eugenio, E. Fanchini, G. Fedotov, A. Filippi, J. A. Fleming, T. A. Forest, A. Fradi, M. Garçon, N. Gevorgyan, Y. Ghandilyan, G. P. Gilfoyle, K. L. Giovanetti, F. X. Girod, C. Gleason, W. Gohn, E. Golovatch, R. W. Gothe, K. A. Griffioen, N. Guler, L. Guo, K. Hafidi, C. Hanretty, N. Harrison, M. Hattawy, D. Heddle, K. Hicks, M. Holtrop, S. M. Hughes, Y. Ilieva, D. G. Ireland, B. S. Ishkhanov, E. L. Isupov, D. Jenkins, H. Jiang, H. S. Jo, K. Joo, S. Joosten, D. Keller, M. Khandaker, W. Kim, A. Klein, F. J. Klein, V. Kubarovsky, S. V. Kuleshov, L. Lanza, P. Lenisa, K. Livingston, H. Y. Lu, I . J . D. MacGregor, N. Markov, M. E. McCracken, B. McKinnon. 2016-04-15. Target and Beam-Target Spin Asymmetries in Exclusive $\pi^+$ and $\pi^-$ Electroproduction with 1.6 to 5.7 GeV Electrons. https://doi.org/10.1103/physrevc.94.055201

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