Extraction of Beam-Spin Asymmetries from the Hard Exclusive π+ Channel off Protons in a Wide Range of Kinematics

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We have measured beam-spin asymmetries to extract the sinφ moment ALUsinφ from the hard exclusive e→p→e′nπ+ reaction above the resonance region, for the first time with nearly full coverage from forward to backward angles in the center of mass. The ALUsinφ moment has been measured up to 6.6 GeV2 in -t, covering the kinematic regimes of generalized parton distributions (GPD) and baryon-to-meson transition distribution amplitudes (TDA) at the same time. The experimental results in very forward kinematics demonstrate the sensitivity to chiral-odd and chiral-even GPDs. In very backward kinematics where the TDA framework is applicable, we found ALUsinφ to be negative, while a sign change was observed near 90° in the center of mass. The unique results presented in this Letter will provide critical constraints to establish reaction mechanisms that can help to further develop the GPD and TDA frameworks.

Extraction of Beam-Spin Asymmetries from the Hard Exclusive π+ Channel off Protons in a Wide Range of Kinematics

Diehl S.;Joo K.;Kim A.;Avakian H.;Kroll P.;Park K.;Riser D.;Semenov-Tian-Shansky K.;Tezgin K.;Adhikari K. P.;Adhikari S.;Amaryan M. J.;Angelini G.;Asryan G.;Atac H.;Barion L.;Battaglieri M.;Bedlinskiy I.;Benmokhtar F.;Bianconi A.;Biselli A. S.;Bossu F.;Boiarinov S.;Briscoe W. J.;Brooks W. K.;Bulumulla D.;Burkert V. D.;Carman D. S.;Carvajal J. C.;Celentano A.;Chatagnon P.;Chetry T.;Ciullo G.;Clark L.;Cole P. L.;Contalbrigo M.;Crede V.;D'Angelo A.;Dashyan N.;De Vita R.;Defurne M.;Deur A.;Dilks C.;Djalali C.;Dupre R.;Egiyan H.;Ehrhart M.;El Alaoui A.;El Fassi L.;Eugenio P.;Filippi A.;Forest T. A.;Ghandilyan Y.;Gilfoyle G. P.;Giovanetti K. L.;Girod F. X.;Glazier D. I.;Golovatch E.;Gothe R. W.;Griffioen K. A.;Guidal M.;Guo L.;Hakobyan H.;Harrison N.;Hattawy M.;Hayward T. B.;Heddle D.;Hicks K.;Holtrop M.;Ilieva Y.;Ireland D. G.;Ishkhanov B. S.;Isupov E. L.;Jenkins D.;Jo H. S.;Joosten S.;Keller D.;Khachatryan M.;Khanal A.;Khandaker M.;Kim C. W.;Kim W.;Kubarovsky V.;Kuhn S. E.;Lanza L.;Leali M.;Lenisa P.;Livingston K.;Macgregor I. J. D.;Marchand D.;Markov N.;Marsicano L.;Mascagna V.;McKinnon B.;Meziani Z. E.;Mineeva T.;Mirazita M.;Mokeev V.;Munoz Camacho C.;Nadel-Turonski P.;Niculescu G.;Osipenko M.;Paolone M.;Pappalardo L. L.;Pasyuk E.;Phelps W.;Pogorelko O.;Price J. W.;Prok Y.;Raue B. A.;Ripani M.;Rizzo A.;Rossi P.;Rowley J.;Sabatie F.;Salgado C.;Schmidt A.;Schumacher R. A.;Sharabian Y. G.;Shrestha U.;Soto O.;Sparveris N.;Stepanyan S.;Stoler P.;Strakovsky I. I.;Strauch S.;Tan J. A.;Tyler N.;Ungaro M.;Venturelli L.;Voskanyan H.;Voutier E.;Watts D. P.;Wei X.;Wood M. H.;Zachariou N.;Zhang J.;Zhao Z. W.

2020-01-01

Abstract

We have measured beam-spin asymmetries to extract the sinφ moment ALUsinφ from the hard exclusive e→p→e′nπ+ reaction above the resonance region, for the first time with nearly full coverage from forward to backward angles in the center of mass. The ALUsinφ moment has been measured up to 6.6 GeV2 in -t, covering the kinematic regimes of generalized parton distributions (GPD) and baryon-to-meson transition distribution amplitudes (TDA) at the same time. The experimental results in very forward kinematics demonstrate the sensitivity to chiral-odd and chiral-even GPDs. In very backward kinematics where the TDA framework is applicable, we found ALUsinφ to be negative, while a sign change was observed near 90° in the center of mass. The unique results presented in this Letter will provide critical constraints to establish reaction mechanisms that can help to further develop the GPD and TDA frameworks.

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Scheda completa

Scheda completa (DC)

	Anno
	
			2020
		
	Rivista
	
			PHYSICAL REVIEW LETTERS
		
	DOI
	
			https://dx.doi.org/10.1103/PhysRevLett.125.182001
		
	Codice PUBMED
	
			33196236
		
	Codice Web of Science
	
			WOS:000582670300011
		
	Codice Scopus
	
			2-s2.0-85094875852
		
	Tutti gli autori
	
			Diehl, S.; Joo, K.; Kim, A.; Avakian, H.; Kroll, P.; Park, K.; Riser, D.; Semenov-Tian-Shansky, K.; Tezgin, K.; Adhikari, K. P.; Adhikari, S.; Amaryan, M. J.; Angelini, G.; Asryan, G.; Atac, H.; Barion, L.; Battaglieri, M.; Bedlinskiy, I.; Benmokhtar, F.; Bianconi, A.; Biselli, A. S.; Bossu, F.; Boiarinov, S.; Briscoe, W. J.; Brooks, W. K.; Bulumulla, D.; Burkert, V. D.; Carman, D. S.; Carvajal, J. C.; Celentano, A.; Chatagnon, P.; Chetry, T.; Ciullo, G.; Clark, L.; Cole, P. L.; Contalbrigo, M.; Crede, V.; D'Angelo, A.; Dashyan, N.; De Vita, R.; Defurne, M.; Deur, A.; Dilks, C.; Djalali, C.; Dupre, R.; Egiyan, H.; Ehrhart, M.; El Alaoui, A.; El Fassi, L.; Eugenio, P.; Filippi, A.; Forest, T. A.; Ghandilyan, Y.; Gilfoyle, G. P.; Giovanetti, K. L.; Girod, F. X.; Glazier, D. I.; Golovatch, E.; Gothe, R. W.; Griffioen, K. A.; Guidal, M.; Guo, L.; Hakobyan, H.; Harrison, N.; Hattawy, M.; Hayward, T. B.; Heddle, D.; Hicks, K.; Holtrop, M.; Ilieva, Y.; Ireland, D. G.; Ishkhanov, B. S.; Isupov, E. L.; Jenkins, D.; Jo, H. S.; Joosten, S.; Keller, D.; Khachatryan, M.; Khanal, A.; Khandaker, M.; Kim, C. W.; Kim, W.; Kubarovsky, V.; Kuhn, S. E.; Lanza, L.; Leali, M.; Lenisa, P.; Livingston, K.; Macgregor, I. J. D.; Marchand, D.; Markov, N.; Marsicano, L.; Mascagna, V.; Mckinnon, B.; Meziani, Z. E.; Mineeva, T.; Mirazita, M.; Mokeev, V.; Munoz Camacho, C.; Nadel-Turonski, P.; Niculescu, G.; Osipenko, M.; Paolone, M.; Pappalardo, L. L.; Pasyuk, E.; Phelps, W.; Pogorelko, O.; Price, J. W.; Prok, Y.; Raue, B. A.; Ripani, M.; Rizzo, A.; Rossi, P.; Rowley, J.; Sabatie, F.; Salgado, C.; Schmidt, A.; Schumacher, R. A.; Sharabian, Y. G.; Shrestha, U.; Soto, O.; Sparveris, N.; Stepanyan, S.; Stoler, P.; Strakovsky, I. I.; Strauch, S.; Tan, J. A.; Tyler, N.; Ungaro, M.; Venturelli, L.; Voskanyan, H.; Voutier, E.; Watts, D. P.; Wei, X.; Wood, M. H.; Zachariou, N.; Zhang, J.; Zhao, Z. W.
		
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11383/2104327

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