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arXiv · 1703.06982

Exclusive $\eta$ electroproduction at $W>2$ GeV with CLAS and transversity generalized parton distributions

CLAS Collaboration·I. Bedlinskiy·V. Kubarovsky·P. Stoler·K. P. Adhikari·Z. Akbar·S. Anefalos Pereira·H. Avakian·J. Ball·N. A. Baltzell·M. Battaglieri·V. Batourine·A. S. Biselli·S. Boiarinov·W. J. Briscoe·V. D. Burkert·T. Cao·D. S. Carman·A. Celentano·S. Chandavar·G. Charles·G. Ciullo·L. Clark·L. Colaneri·P. L. Cole·M. Contalbrigo·V. Crede·A. D'Angelo·N. Dashyan·R. De Vita·E. De Sanctis·A. Deur·C. Djalali·R. Dupre·A. El Alaoui·L. El Fassi·L. Elouadrhiri·P. Eugenio·E. Fanchini·G. Fedotov·R. Fersch·A. Filippi·J. A. Fleming·T. A. Forest·M. Garçon·N. Gevorgyan·Y. Ghandilyan·G. P. Gilfoyle·K. L. Giovanetti·F. X. Girod·C. Gleason·E. Golovatch·R. W. Gothe·K. A. Griffioen·M. Guidal·L. Guo·K. Hafidi·H. Hakobyan·C. Hanretty·N. Harrison·M. Hattawy·K. Hicks·S. M. Hughes·C. E. Hyde·Y. Ilieva·D. G. Ireland·B. S. Ishkhanov·E. L. Isupov·D. Jenkins·H. Jiang·H. S. Jo·K. Joo·S. Joosten·D. Keller·G. Khachatryan·M. Khachatryan·M. Khandaker·A. Kim·W. Kim·F. J. Klein·S. E. Kuhn·S. V. Kuleshov·L. Lanza·P. Lenisa·K. Livingston·I. J. D. MacGregor·N. Markov·B. McKinnon·Z. E. Meziani·M. Mirazita·V. Mokeev·R. A. Montgomery·A. Movsisyan·C. Munoz Camacho·P. Nadel-Turonski·L. A. Net·A. Ni·S. Niccolai·G. Niculescu·M. Osipenko
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Abstract

The cross section of the exclusive $\eta$ electroproduction reaction $ep\to e^\prime p^\prime \eta$ was measured at Jefferson Lab with a 5.75-GeV electron beam and the CLAS detector. Differential cross sections $d^4\sigma/dtdQ^2dx_Bd\phi_\eta$ and structure functions $\sigma_U = \sigma_T+\epsilon\sigma_L, \sigma_{TT}$ and $\sigma_{LT}$, as functions of $t$ were obtained over a wide range of $Q^2$ and $x_B$. The $\eta$ structure functions are compared with those previously measured for $\pi^0$ at the same kinematics. At low $t$, both $\pi^0$ and $\eta$ are described reasonably well by generalized parton distributions (GPDs) in which chiral-odd transversity GPDs are dominant. The $\pi^0$ and $\eta$ data, when taken together, can facilitate the flavor decomposition of the transversity GPDs.

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CLAS Collaboration, I. Bedlinskiy, V. Kubarovsky, P. Stoler, K. P. Adhikari, Z. Akbar, S. Anefalos Pereira, H. Avakian, J. Ball, N. A. Baltzell, M. Battaglieri, V. Batourine, A. S. Biselli, S. Boiarinov, W. J. Briscoe, V. D. Burkert, T. Cao, D. S. Carman, A. Celentano, S. Chandavar, G. Charles, G. Ciullo, L. Clark, L. Colaneri, P. L. Cole, M. Contalbrigo, V. Crede, A. D'Angelo, N. Dashyan, R. De Vita, E. De Sanctis, A. Deur, C. Djalali, R. Dupre, A. El Alaoui, L. El Fassi, L. Elouadrhiri, P. Eugenio, E. Fanchini, G. Fedotov, R. Fersch, A. Filippi, J. A. Fleming, T. A. Forest, M. Garçon, N. Gevorgyan, Y. Ghandilyan, G. P. Gilfoyle, K. L. Giovanetti, F. X. Girod, C. Gleason, E. Golovatch, R. W. Gothe, K. A. Griffioen, M. Guidal, L. Guo, K. Hafidi, H. Hakobyan, C. Hanretty, N. Harrison, M. Hattawy, K. Hicks, S. M. Hughes, C. E. Hyde, Y. Ilieva, D. G. Ireland, B. S. Ishkhanov, E. L. Isupov, D. Jenkins, H. Jiang, H. S. Jo, K. Joo, S. Joosten, D. Keller, G. Khachatryan, M. Khachatryan, M. Khandaker, A. Kim, W. Kim, F. J. Klein, S. E. Kuhn, S. V. Kuleshov, L. Lanza, P. Lenisa, K. Livingston, I. J. D. MacGregor, N. Markov, B. McKinnon, Z. E. Meziani, M. Mirazita, V. Mokeev, R. A. Montgomery, A. Movsisyan, C. Munoz Camacho, P. Nadel-Turonski, L. A. Net, A. Ni, S. Niccolai, G. Niculescu, M. Osipenko. 2017-03-20. Exclusive $\eta$ electroproduction at $W>2$ GeV with CLAS and transversity generalized parton distributions. https://doi.org/10.1103/physrevc.95.035202

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