Abstract
The helicity amplitudes of the electroexcitation of the Roper resonance are extracted for 1.7<Q2<4.5GeV2 from recent high precision JLab-CLAS cross section and longitudinally polarized beam asymmetry data for π+ electroproduction on protons at W=1.15-1.69 GeV. The analysis is made using two approaches, dispersion relations and a unitary isobar model, which give consistent Q2 behavior of the helicity amplitudes for the γ *p→N(1440)P11 transition. It is found that the transverse helicity amplitude A1/2, which is large and negative at Q2=0, becomes large and positive at Q2 2GeV2, and then drops slowly with Q2. The longitudinal helicity amplitude S1/2, which was previously found from CLAS e→p→epπ0,enπ+ data to be large and positive at Q2=0.4,0.65GeV2, drops with Q2. Available model predictions for γ*p→N(1440)P11 allow us to conclude that these results provide strong evidence in favor of N(1440)P11 as a first radial excitation of the 3q ground state. The results of the present paper also confirm the conclusion of our previous analysis for Q2<1 GeV2 that the presentation of N(1440)P11 as a qG3 hybrid state is ruled out.
| Original language | English (US) |
|---|---|
| Article number | 045209 |
| Journal | Physical Review C - Nuclear Physics |
| Volume | 78 |
| Issue number | 4 |
| DOIs | |
| State | Published - Oct 27 2008 |
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In: Physical Review C - Nuclear Physics, Vol. 78, No. 4, 045209, 27.10.2008.
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TY - JOUR
T1 - Electroexcitation of the Roper resonance for 1.7<Q2<4.5GeV2 in e→p→enπ+
AU - Aznauryan, I. G.
AU - Burkert, V. D.
AU - Kim, W.
AU - Park, K.
AU - Adams, G.
AU - Amaryan, M. J.
AU - Ambrozewicz, P.
AU - Anghinolfi, M.
AU - Asryan, G.
AU - Avakian, H.
AU - Bagdasaryan, H.
AU - Baillie, N.
AU - Ball, J. P.
AU - Baltzell, N. A.
AU - Barrow, S.
AU - Batourine, V.
AU - Battaglieri, M.
AU - Bedlinskiy, I.
AU - Bektasoglu, M.
AU - Bellis, M.
AU - Benmouna, N.
AU - Berman, B. L.
AU - Biselli, A. S.
AU - Blaszczyk, L.
AU - Bonner, B. E.
AU - Bookwalter, C.
AU - Bouchigny, S.
AU - Boiarinov, S.
AU - Bradford, R.
AU - Branford, D.
AU - Briscoe, W. J.
AU - Brooks, W. K.
AU - Bültmann, S.
AU - Butuceanu, C.
AU - Calarco, J. R.
AU - Careccia, S. L.
AU - Carman, D. S.
AU - Casey, L.
AU - Cazes, A.
AU - Chen, S.
AU - Cheng, L.
AU - Cole, P. L.
AU - Collins, P.
AU - Coltharp, P.
AU - Cords, D.
AU - Corvisiero, P.
AU - Crabb, D.
AU - Crede, V.
AU - Cummings, J. P.
AU - Dale, D.
AU - Dashyan, N.
AU - De Masi, R.
AU - De Vita, R.
AU - De Sanctis, E.
AU - Degtyarenko, P. V.
AU - Denizli, H.
AU - Dennis, L.
AU - Deur, A.
AU - Dhamija, S.
AU - Dharmawardane, K. V.
AU - Dhuga, K. S.
AU - Dickson, R.
AU - Djalali, C.
AU - Dodge, G. E.
AU - Donnelly, J.
AU - Doughty, D.
AU - Dugger, M.
AU - Dytman, S.
AU - Dzyubak, O. P.
AU - Egiyan, H.
AU - Egiyan, K. S.
AU - El Fassi, L.
AU - Elouadrhiri, L.
AU - Eugenio, P.
AU - Fatemi, R.
AU - Fedotov, G.
AU - Feldman, G.
AU - Feuerbach, R. J.
AU - Forest, T. A.
AU - Fradi, A.
AU - Funsten, H.
AU - Gabrielyan, M. Y.
AU - Garçon, M.
AU - Gavalian, G.
AU - Gevorgyan, N.
AU - Gilfoyle, G. P.
AU - Giovanetti, K. L.
AU - Girod, F. X.
AU - Goetz, J. T.
AU - Gohn, W.
AU - Golovatch, E.
AU - Gonenc, A.
AU - Gordon, C. I.O.
AU - Gothe, R. W.
AU - Graham, L.
AU - Griffioen, K. A.
AU - Guidal, M.
AU - Guillo, M.
AU - Guler, N.
AU - Guo, L.
AU - Gyurjyan, V.
AU - Hadjidakis, C.
AU - Hafidi, K.
AU - Hafnaoui, K.
AU - Hakobyan, H.
AU - Hakobyan, R. S.
AU - Hanretty, C.
AU - Hardie, J.
AU - Hassall, N.
AU - Heddle, D.
AU - Hersman, F. W.
AU - Hicks, K.
AU - Hleiqawi, I.
AU - Holtrop, M.
AU - Hyde, C. E.
AU - Ilieva, Y.
AU - Ireland, D. G.
AU - Ishkhanov, B. S.
AU - Isupov, E. L.
AU - Ito, M. M.
AU - Jenkins, D.
AU - Jo, H. S.
AU - Johnstone, J. R.
AU - Joo, K.
AU - Juengst, H. G.
AU - Kalantarians, N.
AU - Keller, D.
AU - Kellie, J. D.
AU - Khandaker, M.
AU - Kim, K. Y.
AU - Klein, A.
AU - Klein, F. J.
AU - Klimenko, A. V.
AU - Kossov, M.
AU - Krahn, Z.
AU - Kramer, L. H.
AU - Kubarovsky, V.
AU - Kuhn, J.
AU - Kuhn, S. E.
AU - Kuleshov, S. V.
AU - Kuznetsov, V.
AU - Lachniet, J.
AU - Laget, J. M.
AU - Langheinrich, J.
AU - Lawrence, D.
AU - Lee, T.
AU - Li, Ji
AU - Lima, A. C.S.
AU - Livingston, K.
AU - Lu, H. Y.
AU - Lukashin, K.
AU - MacCormick, M.
AU - Markov, N.
AU - Mattione, P.
AU - McAleer, S.
AU - McKinnon, B.
AU - McNabb, J. W.C.
AU - Mecking, B. A.
AU - Mehrabyan, S.
AU - Melone, J. J.
AU - Mestayer, M. D.
AU - Meyer, C. A.
AU - Mibe, T.
AU - Mikhailov, K.
AU - Minehart, R.
AU - Mirazita, M.
AU - Miskimen, R.
AU - Mokeev, V.
AU - Morand, L.
AU - Moreno, B.
AU - Moriya, K.
AU - Morrow, S. A.
AU - Moteabbed, M.
AU - Mueller, J.
AU - Munevar, E.
AU - Mutchler, G. S.
AU - Nadel-Turonski, P.
AU - Nasseripour, R.
AU - Niccolai, S.
AU - Niculescu, G.
AU - Niculescu, I.
AU - Niczyporuk, B. B.
AU - Niroula, M. R.
AU - Niyazov, R. A.
AU - Nozar, M.
AU - O'Rielly, G. V.
AU - Osipenko, M.
AU - Ostrovidov, A. I.
AU - Park, S.
AU - Pasyuk, E.
AU - Paterson, C.
AU - Pereira, S. Anefalos
AU - Philips, S. A.
AU - Pierce, J.
AU - Pivnyuk, N.
AU - Pocanic, D.
AU - Pogorelko, O.
AU - Polli, E.
AU - Popa, I.
AU - Pozdniakov, S.
AU - Preedom, B. M.
AU - Price, J. W.
AU - Prok, Y.
AU - Protopopescu, D.
AU - Qin, L. M.
AU - Raue, B. A.
AU - Riccardi, G.
AU - Ricco, G.
AU - Ripani, M.
AU - Ritchie, B. G.
AU - Rosner, G.
AU - Rossi, P.
AU - Rowntree, D.
AU - Rubin, P. D.
AU - Sabatié, F.
AU - Saini, M. S.
AU - Salamanca, J.
AU - Salgado, C.
AU - Santoro, J. P.
AU - Sapunenko, V.
AU - Schott, D.
AU - Schumacher, R. A.
AU - Serov, V. S.
AU - Sharabian, Y. G.
AU - Sharov, D.
AU - Shaw, J.
AU - Shvedunov, N. V.
AU - Skabelin, A. V.
AU - Smith, E. S.
AU - Smith, L. C.
AU - Sober, D. I.
AU - Sokhan, D.
AU - Stavinsky, A.
AU - Stepanyan, S. S.
AU - Stepanyan, S.
AU - Stokes, B. E.
AU - Stoler, P.
AU - Strakovsky, I. I.
AU - Strauch, S.
AU - Suleiman, R.
AU - Taiuti, M.
AU - Takeuchi, T.
AU - Tedeschi, D. J.
AU - Tkabladze, A.
AU - Tkachenko, S.
AU - Todor, L.
AU - Tur, C.
AU - Ungaro, M.
AU - Vineyard, M. F.
AU - Vlassov, A. V.
AU - Watts, D. P.
AU - Weinstein, L. B.
AU - Weygand, D. P.
AU - Williams, M.
AU - Wolin, E.
AU - Wood, M. H.
AU - Yegneswaran, A.
AU - Yun, J.
AU - Yurov, M.
AU - Zana, L.
AU - Zhang, B.
AU - Zhang, J.
AU - Zhao, B.
AU - Zhao, Z. W.
PY - 2008/10/27
Y1 - 2008/10/27
N2 - The helicity amplitudes of the electroexcitation of the Roper resonance are extracted for 1.7<Q2<4.5GeV2 from recent high precision JLab-CLAS cross section and longitudinally polarized beam asymmetry data for π+ electroproduction on protons at W=1.15-1.69 GeV. The analysis is made using two approaches, dispersion relations and a unitary isobar model, which give consistent Q2 behavior of the helicity amplitudes for the γ *p→N(1440)P11 transition. It is found that the transverse helicity amplitude A1/2, which is large and negative at Q2=0, becomes large and positive at Q2 2GeV2, and then drops slowly with Q2. The longitudinal helicity amplitude S1/2, which was previously found from CLAS e→p→epπ0,enπ+ data to be large and positive at Q2=0.4,0.65GeV2, drops with Q2. Available model predictions for γ*p→N(1440)P11 allow us to conclude that these results provide strong evidence in favor of N(1440)P11 as a first radial excitation of the 3q ground state. The results of the present paper also confirm the conclusion of our previous analysis for Q2<1 GeV2 that the presentation of N(1440)P11 as a qG3 hybrid state is ruled out.
AB - The helicity amplitudes of the electroexcitation of the Roper resonance are extracted for 1.7<Q2<4.5GeV2 from recent high precision JLab-CLAS cross section and longitudinally polarized beam asymmetry data for π+ electroproduction on protons at W=1.15-1.69 GeV. The analysis is made using two approaches, dispersion relations and a unitary isobar model, which give consistent Q2 behavior of the helicity amplitudes for the γ *p→N(1440)P11 transition. It is found that the transverse helicity amplitude A1/2, which is large and negative at Q2=0, becomes large and positive at Q2 2GeV2, and then drops slowly with Q2. The longitudinal helicity amplitude S1/2, which was previously found from CLAS e→p→epπ0,enπ+ data to be large and positive at Q2=0.4,0.65GeV2, drops with Q2. Available model predictions for γ*p→N(1440)P11 allow us to conclude that these results provide strong evidence in favor of N(1440)P11 as a first radial excitation of the 3q ground state. The results of the present paper also confirm the conclusion of our previous analysis for Q2<1 GeV2 that the presentation of N(1440)P11 as a qG3 hybrid state is ruled out.
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U2 - 10.1103/PhysRevC.78.045209
DO - 10.1103/PhysRevC.78.045209
M3 - Article
AN - SCOPUS:55949134648
SN - 0556-2813
VL - 78
JO - Physical Review C - Nuclear Physics
JF - Physical Review C - Nuclear Physics
IS - 4
M1 - 045209
ER -