Hard exclusive pion electroproduction at backward angles with CLAS

We report on the first measurement of cross sections for exclusive deeply virtual pion electroproduction off the proton, ep→e′nπ+, above the resonance region at backward pion center-of-mass angles. The φπ⁎-dependent cross sections were measured, from which we extracted three combinations of structur...

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Veröffentlicht in:	Physics letters. B 2018-05, Vol.780 (C), p.340-345
Hauptverfasser:	Guidal, M., Gothe, R.W., Pire, B., Semenov-Tian-Shansky, K., Laget, J.-M., Adhikari, S., Akbar, Z., Avakian, H., Ball, J., Baltzell, N.A., Barion, L., Battaglieri, M., Bedlinskiy, I., Biselli, A.S., Briscoe, W.J., Brooks, W.K., Burkert, V.D., Cao, F.T., Carman, D.S., Celentano, A., Charles, G., Chetry, T., Contalbrigo, M., D'Angelo, A., Dashyan, N., De Vita, R., De Sanctis, E., Defurne, M., Deur, A., Djalali, C., Egiyan, H., El Alaoui, A., El Fassi, L., Elouadrhiri, L., Eugenio, P., Fedotov, G., Fersch, R., Filippi, A., Garçon, M., Gilfoyle, G.P., Girod, F.X., Golovatch, E., Griffioen, K.A., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Harrison, N., Hattawy, M., Heddle, D., Hicks, K., Holtrop, M., Hyde, C.E., Ireland, D.G., Ishkhanov, B.S., Isupov, E.L., Jenkins, D., Johnston, S., Joo, K., Kabir, M.L., Keller, D., Khachatryan, G., Khachatryan, M., Khandaker, M., Klein, F.J., Kubarovsky, V., Lanza, L., Livingston, K., MacGregor, I.J.D., McKinnon, B., Mirazita, M., Mokeev, V., Munoz Camacho, C., Nadel-Turonski, P., Niccolai, S., Niculescu, G., Osipenko, M., Paolone, M., Pasyuk, E., Pogorelko, O., Poudel, J., Price, J.W., Protopopescu, D., Ripani, M., Rizzo, A., Rossi, P., Sabatié, F., Schumacher, R.A., Sharabian, Y., Smith, G.D., Stepanyan, S., Strakovsky, I.I., Strauch, S., Taiuti, M., Tan, J.A., Ungaro, M., Voskanyan, H., Wei, X., Zachariou, N., Zhang, J.
Format:	Artikel
Sprache:	eng
Schlagworte:	CLAS Electroproduction Eletroproduction Exclusive single pion High Energy Physics - Experiment High Energy Physics - Phenomenology Nuclear Experiment NUCLEAR PHYSICS AND RADIATION PHYSICS Physics PHYSICS OF ELEMENTARY PARTICLES AND FIELDS pion electroproduction TDA
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Beschreibung
Zusammenfassung:	We report on the first measurement of cross sections for exclusive deeply virtual pion electroproduction off the proton, ep→e′nπ+, above the resonance region at backward pion center-of-mass angles. The φπ⁎-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.
ISSN:	0370-2693 1873-2445
DOI:	10.1016/j.physletb.2018.03.026