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Results are presented for the first measurement of the double-polarization helicity asymmetry E for the η photoproduction reaction γp→ηp. Data were obtained using the FROzen Spin Target (FROST) with the CLAS spectrometer in Hall B at Jefferson Lab, covering a range of center-of-mass energy W from threshold to 2.15 GeV and a large range in center-of-mass polar angle. As an initial application of these data, the results have been incorporated into the Jülich–Bonn model to examine the case for the existence of a narrow N⁎ resonance between 1.66 and 1.70 GeV. The addition of these data to the world database results in marked changes in the predictions for the E observable from that model. Further comparison with several theoretical approaches indicates these data will significantly enhance our understanding of nucleon resonances.

First measurement of the helicity asymmetry E in η photoproduction on the proton

Senderovich, I.;Morrison, B. T.;Dugger, M.;Ritchie, B. G.;Pasyuk, E.;Tucker, R.;Brock, J.;Carlin, C.;Keith, C. D.;Meekins, D. G.;Seely, M. L.;Rönchen, D.;Döring, M.;Collins, P.;Adhikari, K. P.;Adikaram, D.;Akbar, Z.;Anderson, M. D.;Anefalos Pereira, S.;Badui, R. A.;Ball, J.;Baltzell, N. A.;Battaglieri, M.;Batourine, V.;Bedlinskiy, I.;Biselli, A. S.;Boiarinov, S.;Briscoe, W. J.;Brooks, W. K.;Burkert, V. D.;Carman, D. S.;Celentano, A.;Chandavar, S.;Charles, G.;Colaneri, L.;Cole, P. L.;Contalbrigo, M.;Cortes, O.;Credé, V.;D'Angelo, A.;Dashyan, N.;De Vita, R.;De Sanctis, E.;Deur, A.;Djalali, C.;Dupre, R.;Egiyan, H.;El Alaoui, A.;El Fassi, L.;Elouadrhiri, L.;Eugenio, P.;Fedotov, G.;Fegan, S.;Filippi, A.;Fleming, J. A.;Fradi, A.;Garillon, B.;Ghandilyan, Y.;Gilfoyle, G. P.;Giovanetti, K. L.;Girod, F. X.;Glazier, D. I.;Goetz, J. T.;Gohn, W.;Golovatch, E.;Gothe, R. W.;Griffioen, K. A.;Guidal, M.;Guo, L.;Hafidi, K.;Hakobyan, H.;Hanretty, C.;Hattawy, M.;Hicks, K.;Ho, D.;Holtrop, M.;Hughes, S. M.;Ilieva, Y.;Ireland, D. G.;Ishkhanov, B. S.;Jenkins, D.;Jiang, H.;Jo, H. S.;Joo, K.;Joosten, S.;Keller, D.;Khachatryan, G.;Khandaker, M.;Kim, A.;Klein, F. J.;Kubarovsky, V.;Kunkel, M. C.;Lenisa, P.;Livingston, K.;Lu, H. Y.;MacGregor, I. J. D.;Mattione, P.;McKinnon, B.;Meyer, C. A.;Mineeva, T.;Mokeev, V.;Montgomery, R. A.;Movsisyan, A.;Munoz Camacho, C.;Nadel-Turonski, P.;Net, L. A.;Niccolai, S.;Niculescu, G.;Niculescu, I.;Osipenko, M.;Park, K.;Park, S.;Peng, P.;Phelps, W.;Pisano, S.;Pogorelko, O.;Price, J. W.;Prok, Y.;Puckett, A. J. R.;Ripani, M.;Rizzo, A.;Rosner, G.;Roy, P.;Sabatié, F.;Salgado, C.;Schott, D.;Schumacher, R. A.;Seder, E.;Simonyan, A.;Skorodumina, Iu.;Smith, G. D.;Sober, D. I.;Sparveris, N.;Stepanyan, S.;Stoler, P.;Strakovsky, I. I.;Strauch, S.;Sytnik, V.;Tian, Ye;Ungaro, M.;Voskanyan, H.;Voutier, E.;Walford, N. K.;Wei, X.;Wood, M. H.;Zachariou, N.;Zana, L.;Zhang, J.;Zhao, Z. W.;Zonta, I.

2016

Abstract

Results are presented for the first measurement of the double-polarization helicity asymmetry E for the η photoproduction reaction γp→ηp. Data were obtained using the FROzen Spin Target (FROST) with the CLAS spectrometer in Hall B at Jefferson Lab, covering a range of center-of-mass energy W from threshold to 2.15 GeV and a large range in center-of-mass polar angle. As an initial application of these data, the results have been incorporated into the Jülich–Bonn model to examine the case for the existence of a narrow N⁎ resonance between 1.66 and 1.70 GeV. The addition of these data to the world database results in marked changes in the predictions for the E observable from that model. Further comparison with several theoretical approaches indicates these data will significantly enhance our understanding of nucleon resonances.

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	Anno di pubblicazione
	
			2016
		
	DOI
	
			https://dx.doi.org/10.1016/j.physletb.2016.01.044
		
	Titolo della Rivista
	
			PHYSICS LETTERS. SECTION B
		
	Tutti gli autori
	
			Senderovich, I.; Morrison, B. T.; Dugger, M.; Ritchie, B. G.; Pasyuk, E.; Tucker, R.; Brock, J.; Carlin, C.; Keith, C. D.; Meekins, D. G.; Seely, M. L.; Rönchen, D.; Döring, M.; Collins, P.; Adhikari, K. P.; Adikaram, D.; Akbar, Z.; Anderson, M. D.; Anefalos Pereira, S.; Badui, R. A.; Ball, J.; Baltzell, N. A.; Battaglieri, M.; Batourine, V.; Bedlinskiy, I.; Biselli, A. S.; Boiarinov, S.; Briscoe, W. J.; Brooks, W. K.; Burkert, V. D.; Carman, D. S.; Celentano, A.; Chandavar, S.; Charles, G.; Colaneri, L.; Cole, P. L.; Contalbrigo, M.; Cortes, O.; Credé, V.; D'Angelo, A.; Dashyan, N.; De Vita, R.; De Sanctis, E.; Deur, A.; Djalali, C.; Dupre, R.; Egiyan, H.; El Alaoui, A.; El Fassi, L.; Elouadrhiri, L.; Eugenio, P.; Fedotov, G.; Fegan, S.; Filippi, A.; Fleming, J. A.; Fradi, A.; Garillon, B.; Ghandilyan, Y.; Gilfoyle, G. P.; Giovanetti, K. L.; Girod, F. X.; Glazier, D. I.; Goetz, J. T.; Gohn, W.; Golovatch, E.; Gothe, R. W.; Griffioen, K. A.; Guidal, M.; Guo, L.; Hafidi, K.; Hakobyan, H.; Hanretty, C.; Hattawy, M.; Hicks, K.; Ho, D.; Holtrop, M.; Hughes, S. M.; Ilieva, Y.; Ireland, D. G.; Ishkhanov, B. S.; Jenkins, D.; Jiang, H.; Jo, H. S.; Joo, K.; Joosten, S.; Keller, D.; Khachatryan, G.; Khandaker, M.; Kim, A.; Klein, F. J.; Kubarovsky, V.; Kunkel, M. C.; Lenisa, P.; Livingston, K.; Lu, H. Y.; Macgregor, I. J. D.; Mattione, P.; Mckinnon, B.; Meyer, C. A.; Mineeva, T.; Mokeev, V.; Montgomery, R. A.; Movsisyan, A.; Munoz Camacho, C.; Nadel-Turonski, P.; Net, L. A.; Niccolai, S.; Niculescu, G.; Niculescu, I.; Osipenko, M.; Park, K.; Park, S.; Peng, P.; Phelps, W.; Pisano, S.; Pogorelko, O.; Price, J. W.; Prok, Y.; Puckett, A. J. R.; Ripani, M.; Rizzo, A.; Rosner, G.; Roy, P.; Sabatié, F.; Salgado, C.; Schott, D.; Schumacher, R. A.; Seder, E.; Simonyan, A.; Skorodumina, Iu.; Smith, G. D.; Sober, D. I.; Sparveris, N.; Stepanyan, S.; Stoler, P.; Strakovsky, I. I.; Strauch, S.; Sytnik, V.; Tian, Ye; Ungaro, M.; Voskanyan, H.; Voutier, E.; Walford, N. K.; Wei, X.; Wood, M. H.; Zachariou, N.; Zana, L.; Zhang, J.; Zhao, Z. W.; Zonta, I.
		
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/2381711

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