Electroexcitation of the Roper resonance for 1.7 Q(2) en pi(+)

I. G. Aznauryan; V. D. Burkert; W. Kim; K. Park; G. Adams; M. J. Amaryan; P. Ambrozewicz; M. Anghinolfi; G. Asryan; H. Avakian; H. Bagdasaryan; N. Baillie; J. P. Ball; N. A. Baltzell; S. Barrow; V. Batourine; M. Battaglieri; I. Bedlinskiy; M. Bektasoglu; M. Bellis; N. Benmouna; B. L. Berman; A. S. Biselli; L. Blaszczyk; B. E. Bonner; C. Bookwalter; S. Bouchigny; S. Boiarinov; R. Bradford; D. Branford; W. J. Briscoe; W. K. Brooks; S. Bueltmann; C. Butuceanu; J. R. Calarco; S. L. Careccia; D. S. Carman; L. Casey; A. Cazes; S. Chen; L. Cheng; P. L. Cole; P. Collins; P. Coltharp; D. Cords; P. Corvisiero; D. Crabb; V. Crede; J. P. Cummings; D. Dale; N. Dashyan; R. De Masi; R. De Vita; E. De Sanctis; P. V. Degtyarenko; H. Denizli; L. Dennis; A. Deur; S. Dhamija; K. V. Dharmawardane; K. S. Dhuga; R. Dickson; C. Djalali; G. E. Dodge; J. Donnelly; D. Doughty; M. Dugger; S. Dytman; O. P. Dzyubak; H. Egiyan; K. S. Egiyan; L. El 05 Fassi; L. Elouadrhiri; P. Eugenio; R. Fatemi; G. Fedotov; G. Feldman; R. J. Feuerbach; T. A. Forest; A. Fradi; H. Funsten; M. Y. Gabrielyan; M. Garcon; G. Gavalian; N. Gevorgyan; G. P. Gilfoyle; K. L. Giovanetti; F. X. Girod; J. T. Goetz; W. Gohn; E. Golovatch; A. Gonenc; C. I. O. Gordon; R. W. Gothe; L. Graham; K. A. Griffioen; M. Guidal; M. Guillo; N. Guler; L. Guo; V. Gyurjyan; C. Hadjidakis; K. Hafidi; K. Hafnaoui; H. Hakobyan; R. S. Hakobyan; C. Hanretty; J. Hardie; N. Hassall; D. Heddle; F. W. Hersman; K. Hicks; I. Hleiqawi; M. Holtrop; C. E. Hyde; Y. Ilieva; D. G. Ireland; B. S. Ishkhanov; E. L. Isupov; M. M. Ito; D. Jenkins; H. S. Jo; J. R. Johnstone; K. Joo; H. G. Juengst; N. Kalantarians; D. Keller; J. D. Kellie; M. Khandaker; K. Y. Kim; A. Klein; F. J. Klein; A. V. Klimenko; M. Kossov; Z. Krahn; L. H. Kramer; V. Kubarovsky; J. Kuhn; S. E. Kuhn; S. V. Kuleshov; V. Kuznetsov; J. Lachniet; J. M. Laget; J. Langheinrich; D. Lawrence; T. Lee; Ji Li; A. C. S. Lima; K. Livingston; H. Y. Lu; K. Lukashin; M. MacCormick; N. Markov; P. Mattione; S. McAleer; B. McKinnon; J. W. C. McNabb; B. A. Mecking; S. Mehrabyan; J. J. Melone; M. D. Mestayer; C. A. Meyer; T. Mibe; K. Mikhailov; R. Minehart; M. Mirazita; R. Miskimen; V. Mokeev; L. Morand; B. Moreno; K. Moriya; S. A. Morrow; M. Moteabbed; J. Mueller; E. Munevar; G. S. Mutchler; P. Nadel-Turonski; R. Nasseripour; S. Niccolai; G. Niculescu; I. Niculescu; B. B. Niczyporuk; M. R. Niroula; R. A. Niyazov; M. Nozar; G. V. O'Rielly; M. Osipenko; A. I. Ostrovidov; S. Park; E. Pasyuk; C. Paterson; S. Anefalos Pereira; S. A. Philips; J. Pierce; N. Pivnyuk; D. Pocanic; O. Pogorelko; E. Polli; I. Popa; S. Pozdniakov; B. M. Preedom; J. W. Price; Y. Prok; D. Protopopescu; L. M. Qin; B. A. Raue; G. Riccardi; G. Ricco; M. Ripani; B. G. Ritchie; G. Rosner; P. Rossi; D. Rowntree; P. D. Rubin; F. Sabatie; M. S. Saini; J. Salamanca; C. Salgado; J. P. Santoro; V. Sapunenko; D. Schott; R. A. Schumacher; V. S. Serov; Y. G. Sharabian; D. Sharov; J. Shaw; N. V. Shvedunov; A. V. Skabelin; E. S. Smith; L. C. Smith; D. I. Sober; D. Sokhan; A. Stavinsky; S. S. Stepanyan; S. Stepanyan; B. E. Stokes; P. Stoler; I. I. Strakovsky; S. Strauch; R. Suleiman; M. Taiuti; T. Takeuchi; D. J. Tedeschi; A. Tkabladze; S. Tkachenko; L. Todor; C. Tur; M. Ungaro; M. F. Vineyard; A. V. Vlassov; D. P. Watts; L. B. Weinstein; D. P. Weygand; M. Williams; E. Wolin; M. H. Wood; A. Yegneswaran; J. Yun; M. Yurov; L. Zana; B. Zhang; J. Zhang; B. Zhao; Z. W. Zhao

doi:10.1103/PhysRevC.78.045209

Electroexcitation of the Roper resonance for 1.7 Q(2) en pi(+)

I. G. Aznauryan, V. D. Burkert, W. Kim, K. Park, G. Adams, M. J. Amaryan, P. Ambrozewicz, M. Anghinolfi, G. Asryan, H. Avakian, H. Bagdasaryan, N. Baillie, J. P. Ball, N. A. Baltzell, S. Barrow, V. Batourine, M. Battaglieri, I. Bedlinskiy, M. Bektasoglu, M. BellisN. Benmouna, B. L. Berman, A. S. Biselli, L. Blaszczyk, B. E. Bonner, C. Bookwalter, S. Bouchigny, S. Boiarinov, R. Bradford, D. Branford, W. J. Briscoe, W. K. Brooks, S. Bueltmann, C. Butuceanu, J. R. Calarco, S. L. Careccia, D. S. Carman, L. Casey, A. Cazes, S. Chen, L. Cheng, P. L. Cole, P. Collins, P. Coltharp, D. Cords, P. Corvisiero, D. Crabb, V. Crede, J. P. Cummings, D. Dale, N. Dashyan, R. De Masi, R. De Vita, E. De Sanctis, P. V. Degtyarenko, H. Denizli, L. Dennis, A. Deur, S. Dhamija, K. V. Dharmawardane, K. S. Dhuga, R. Dickson, C. Djalali, G. E. Dodge, J. Donnelly, D. Doughty, M. Dugger, S. Dytman, O. P. Dzyubak, H. Egiyan, K. S. Egiyan, L. El 05 Fassi, L. Elouadrhiri, P. Eugenio, R. Fatemi, G. Fedotov, G. Feldman, R. J. Feuerbach, T. A. Forest, A. Fradi, H. Funsten, M. Y. Gabrielyan, M. Garcon, G. Gavalian, N. Gevorgyan, G. P. Gilfoyle, K. L. Giovanetti, F. X. Girod, J. T. Goetz, W. Gohn, E. Golovatch, A. Gonenc, C. I. O. Gordon, R. W. Gothe, L. Graham, K. A. Griffioen, M. Guidal, M. Guillo, N. Guler, L. Guo, V. Gyurjyan, C. Hadjidakis, K. Hafidi, K. Hafnaoui, H. Hakobyan, R. S. Hakobyan, C. Hanretty, J. Hardie, N. Hassall, D. Heddle, F. W. Hersman, K. Hicks, I. Hleiqawi, M. Holtrop, C. E. Hyde, Y. Ilieva, D. G. Ireland, B. S. Ishkhanov, E. L. Isupov, M. M. Ito, D. Jenkins, H. S. Jo, J. R. Johnstone, K. Joo, H. G. Juengst, N. Kalantarians, D. Keller, J. D. Kellie, M. Khandaker, K. Y. Kim, A. Klein, F. J. Klein, A. V. Klimenko, M. Kossov, Z. Krahn, L. H. Kramer, V. Kubarovsky, J. Kuhn, S. E. Kuhn, S. V. Kuleshov, V. Kuznetsov, J. Lachniet, J. M. Laget, J. Langheinrich, D. Lawrence, T. Lee, Ji Li, A. C. S. Lima, K. Livingston, H. Y. Lu, K. Lukashin, M. MacCormick, N. Markov, P. Mattione, S. McAleer, B. McKinnon, J. W. C. McNabb, B. A. Mecking, S. Mehrabyan, J. J. Melone, M. D. Mestayer, C. A. Meyer, T. Mibe, K. Mikhailov, R. Minehart, M. Mirazita, R. Miskimen, V. Mokeev, L. Morand, B. Moreno, K. Moriya, S. A. Morrow, M. Moteabbed, J. Mueller, E. Munevar, G. S. Mutchler, P. Nadel-Turonski, R. Nasseripour, S. Niccolai, G. Niculescu, I. Niculescu, B. B. Niczyporuk, M. R. Niroula, R. A. Niyazov, M. Nozar, G. V. O'Rielly, M. Osipenko, A. I. Ostrovidov, S. Park, E. Pasyuk, C. Paterson, S. Anefalos Pereira, S. A. Philips, J. Pierce, N. Pivnyuk, D. Pocanic, O. Pogorelko, E. Polli, I. Popa, S. Pozdniakov, B. M. Preedom, J. W. Price, Y. Prok, D. Protopopescu, L. M. Qin, B. A. Raue, G. Riccardi, G. Ricco, M. Ripani, B. G. Ritchie, G. Rosner, P. Rossi, D. Rowntree, P. D. Rubin, F. Sabatie, M. S. Saini, J. Salamanca, C. Salgado, J. P. Santoro, V. Sapunenko, D. Schott, R. A. Schumacher, V. S. Serov, Y. G. Sharabian, D. Sharov, J. Shaw, N. V. Shvedunov, A. V. Skabelin, E. S. Smith, L. C. Smith, D. I. Sober, D. Sokhan, A. Stavinsky, S. S. Stepanyan, S. Stepanyan, B. E. Stokes, P. Stoler, I. I. Strakovsky, S. Strauch, R. Suleiman, M. Taiuti, T. Takeuchi, D. J. Tedeschi, A. Tkabladze, S. Tkachenko, L. Todor, C. Tur, M. Ungaro, M. F. Vineyard, A. V. Vlassov, D. P. Watts, L. B. Weinstein, D. P. Weygand, M. Williams, E. Wolin, M. H. Wood, A. Yegneswaran, J. Yun, M. Yurov, L. Zana, B. Zhang, J. Zhang, B. Zhao, Z. W. Zhao

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract / Description of output

The helicity amplitudes of the electroexcitation of the Roper resonance are extracted for 1.7 < Q(2)< 4.5 GeV2 from recent high precision JLab-CLAS cross section and longitudinally polarized beam asymmetry data for pi(+) 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 Q(2) behavior of the helicity amplitudes for the gamma(*)p -> N(1440)P-11 transition. It is found that the transverse helicity amplitude A(1/2), which is large and negative at Q(2)=0, becomes large and positive at Q(2)similar or equal to 2 GeV2, and then drops slowly with Q(2). The longitudinal helicity amplitude S-1/2, which was previously found from CLAS ep -> ep pi(0),en pi(+) data to be large and positive at Q(2)=0.4,0.65 GeV2, drops with Q(2). Available model predictions for gamma(*)p -> N(1440)P-11 allow us to conclude that these results provide strong evidence in favor of N(1440)P-11 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 Q(2)< 1 GeV2 that the presentation of N(1440)P-11 as a q(3)G hybrid state is ruled out.

Original language	English
Article number	045209
Pages (from-to)	-
Number of pages	7
Journal	Physical Review C
Volume	78
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevC.78.045209
Publication status	Published - Oct 2008

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10.1103/PhysRevC.78.045209

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http://prc.aps.org/abstract/PRC/v78/i4/e045209

Cite this

Aznauryan, I. G., Burkert, V. D., Kim, W., Park, K., Adams, G., Amaryan, M. J., Ambrozewicz, P., Anghinolfi, M., Asryan, G., Avakian, H., Bagdasaryan, H., Baillie, N., Ball, J. P., Baltzell, N. A., Barrow, S., Batourine, V., Battaglieri, M., Bedlinskiy, I., Bektasoglu, M., ... Zhao, Z. W. (2008). Electroexcitation of the Roper resonance for 1.7 Q(2) en pi(+). Physical Review C, 78(4), -. Article 045209. https://doi.org/10.1103/PhysRevC.78.045209

@article{1cd9d5d21b1c4687a20a55368b0f0a02,

title = "Electroexcitation of the Roper resonance for 1.7 Q(2) en pi(+)",

abstract = "The helicity amplitudes of the electroexcitation of the Roper resonance are extracted for 1.7 < Q(2)< 4.5 GeV2 from recent high precision JLab-CLAS cross section and longitudinally polarized beam asymmetry data for pi(+) 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 Q(2) behavior of the helicity amplitudes for the gamma(*)p -> N(1440)P-11 transition. It is found that the transverse helicity amplitude A(1/2), which is large and negative at Q(2)=0, becomes large and positive at Q(2)similar or equal to 2 GeV2, and then drops slowly with Q(2). The longitudinal helicity amplitude S-1/2, which was previously found from CLAS ep -> ep pi(0),en pi(+) data to be large and positive at Q(2)=0.4,0.65 GeV2, drops with Q(2). Available model predictions for gamma(*)p -> N(1440)P-11 allow us to conclude that these results provide strong evidence in favor of N(1440)P-11 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 Q(2)< 1 GeV2 that the presentation of N(1440)P-11 as a q(3)G hybrid state is ruled out.",

author = "Aznauryan, {I. G.} and Burkert, {V. D.} and W. Kim and K. Park and G. Adams and Amaryan, {M. J.} and P. Ambrozewicz and M. Anghinolfi and G. Asryan and H. Avakian and H. Bagdasaryan and N. Baillie and Ball, {J. P.} and Baltzell, {N. A.} and S. Barrow and V. Batourine and M. Battaglieri and I. Bedlinskiy and M. Bektasoglu and M. Bellis and N. Benmouna and Berman, {B. L.} and Biselli, {A. S.} and L. Blaszczyk and Bonner, {B. E.} and C. Bookwalter and S. Bouchigny and S. Boiarinov and R. Bradford and D. Branford and Briscoe, {W. J.} and Brooks, {W. K.} and S. Bueltmann and C. Butuceanu and Calarco, {J. R.} and Careccia, {S. L.} and Carman, {D. S.} and L. Casey and A. Cazes and S. Chen and L. Cheng and Cole, {P. L.} and P. Collins and P. Coltharp and D. Cords and P. Corvisiero and D. Crabb and V. Crede and Cummings, {J. P.} and D. Dale and N. Dashyan and Masi, {R. De} and Vita, {R. De} and Sanctis, {E. De} and Degtyarenko, {P. V.} and H. Denizli and L. Dennis and A. Deur and S. Dhamija and Dharmawardane, {K. V.} and Dhuga, {K. S.} and R. Dickson and C. Djalali and Dodge, {G. E.} and J. Donnelly and D. Doughty and M. Dugger and S. Dytman and Dzyubak, {O. P.} and H. Egiyan and Egiyan, {K. S.} and Fassi, {L. El 05} and L. Elouadrhiri and P. Eugenio and R. Fatemi and G. Fedotov and G. Feldman and Feuerbach, {R. J.} and Forest, {T. A.} and A. Fradi and H. Funsten and Gabrielyan, {M. Y.} and M. Garcon and G. Gavalian and N. Gevorgyan and Gilfoyle, {G. P.} and Giovanetti, {K. L.} and Girod, {F. X.} and Goetz, {J. T.} and W. Gohn and E. Golovatch and A. Gonenc and Gordon, {C. I. O.} and Gothe, {R. W.} and L. Graham and Griffioen, {K. A.} and M. Guidal and M. Guillo and N. Guler and L. Guo and V. Gyurjyan and C. Hadjidakis and K. Hafidi and K. Hafnaoui and H. Hakobyan and Hakobyan, {R. S.} and C. Hanretty and J. Hardie and N. Hassall and D. Heddle and Hersman, {F. W.} and K. Hicks and I. Hleiqawi and M. Holtrop and Hyde, {C. E.} and Y. Ilieva and Ireland, {D. G.} and Ishkhanov, {B. S.} and Isupov, {E. L.} and Ito, {M. M.} and D. Jenkins and Jo, {H. S.} and Johnstone, {J. R.} and K. Joo and Juengst, {H. G.} and N. Kalantarians and D. Keller and Kellie, {J. D.} and M. Khandaker and Kim, {K. Y.} and A. Klein and Klein, {F. J.} and Klimenko, {A. V.} and M. Kossov and Z. Krahn and Kramer, {L. H.} and V. Kubarovsky and J. Kuhn and Kuhn, {S. E.} and Kuleshov, {S. V.} and V. Kuznetsov and J. Lachniet and Laget, {J. M.} and J. Langheinrich and D. Lawrence and T. Lee and Ji Li and Lima, {A. C. S.} and K. Livingston and Lu, {H. Y.} and K. Lukashin and M. MacCormick and N. Markov and P. Mattione and S. McAleer and B. McKinnon and McNabb, {J. W. C.} and Mecking, {B. A.} and S. Mehrabyan and Melone, {J. J.} and Mestayer, {M. D.} and Meyer, {C. A.} and T. Mibe and K. Mikhailov and R. Minehart and M. Mirazita and R. Miskimen and V. Mokeev and L. Morand and B. Moreno and K. Moriya and Morrow, {S. A.} and M. Moteabbed and J. Mueller and E. Munevar and Mutchler, {G. S.} and P. Nadel-Turonski and R. Nasseripour and S. Niccolai and G. Niculescu and I. Niculescu and Niczyporuk, {B. B.} and Niroula, {M. R.} and Niyazov, {R. A.} and M. Nozar and O'Rielly, {G. V.} and M. Osipenko and Ostrovidov, {A. I.} and S. Park and E. Pasyuk and C. Paterson and Pereira, {S. Anefalos} and Philips, {S. A.} and J. Pierce and N. Pivnyuk and D. Pocanic and O. Pogorelko and E. Polli and I. Popa and S. Pozdniakov and Preedom, {B. M.} and Price, {J. W.} and Y. Prok and D. Protopopescu and Qin, {L. M.} and Raue, {B. A.} and G. Riccardi and G. Ricco and M. Ripani and Ritchie, {B. G.} and G. Rosner and P. Rossi and D. Rowntree and Rubin, {P. D.} and F. Sabatie and Saini, {M. S.} and J. Salamanca and C. Salgado and Santoro, {J. P.} and V. Sapunenko and D. Schott and Schumacher, {R. A.} and Serov, {V. S.} and Sharabian, {Y. G.} and D. Sharov and J. Shaw and Shvedunov, {N. V.} and Skabelin, {A. V.} and Smith, {E. S.} and Smith, {L. C.} and Sober, {D. I.} and D. Sokhan and A. Stavinsky and Stepanyan, {S. S.} and S. Stepanyan and Stokes, {B. E.} and P. Stoler and Strakovsky, {I. I.} and S. Strauch and R. Suleiman and M. Taiuti and T. Takeuchi and Tedeschi, {D. J.} and A. Tkabladze and S. Tkachenko and L. Todor and C. Tur and M. Ungaro and Vineyard, {M. F.} and Vlassov, {A. V.} and Watts, {D. P.} and Weinstein, {L. B.} and Weygand, {D. P.} and M. Williams and E. Wolin and Wood, {M. H.} and A. Yegneswaran and J. Yun and M. Yurov and L. Zana and B. Zhang and J. Zhang and B. Zhao and Zhao, {Z. W.}",

year = "2008",

month = oct,

doi = "10.1103/PhysRevC.78.045209",

language = "English",

volume = "78",

pages = "--",

journal = "Physical Review C",

issn = "0556-2813",

publisher = "American Physical Society",

number = "4",

}

Aznauryan, IG, Burkert, VD, Kim, W, Park, K, Adams, G, Amaryan, MJ, Ambrozewicz, P, Anghinolfi, M, Asryan, G, Avakian, H, Bagdasaryan, H, Baillie, N, Ball, JP, Baltzell, NA, Barrow, S, Batourine, V, Battaglieri, M, Bedlinskiy, I, Bektasoglu, M, Bellis, M, Benmouna, N, Berman, BL, Biselli, AS, Blaszczyk, L, Bonner, BE, Bookwalter, C, Bouchigny, S, Boiarinov, S, Bradford, R, Branford, D, Briscoe, WJ, Brooks, WK, Bueltmann, S, Butuceanu, C, Calarco, JR, Careccia, SL, Carman, DS, Casey, L, Cazes, A, Chen, S, Cheng, L, Cole, PL, Collins, P, Coltharp, P, Cords, D, Corvisiero, P, Crabb, D, Crede, V, Cummings, JP, Dale, D, Dashyan, N, Masi, RD, Vita, RD, Sanctis, ED, Degtyarenko, PV, Denizli, H, Dennis, L, Deur, A, Dhamija, S, Dharmawardane, KV, Dhuga, KS, Dickson, R, Djalali, C, Dodge, GE, Donnelly, J, Doughty, D, Dugger, M, Dytman, S, Dzyubak, OP, Egiyan, H, Egiyan, KS, Fassi, LE, Elouadrhiri, L, Eugenio, P, Fatemi, R, Fedotov, G, Feldman, G, Feuerbach, RJ, Forest, TA, Fradi, A, Funsten, H, Gabrielyan, MY, Garcon, M, Gavalian, G, Gevorgyan, N, Gilfoyle, GP, Giovanetti, KL, Girod, FX, Goetz, JT, Gohn, W, Golovatch, E, Gonenc, A, Gordon, CIO, Gothe, RW, Graham, L, Griffioen, KA, Guidal, M, Guillo, M, Guler, N, Guo, L, Gyurjyan, V, Hadjidakis, C, Hafidi, K, Hafnaoui, K, Hakobyan, H, Hakobyan, RS, Hanretty, C, Hardie, J, Hassall, N, Heddle, D, Hersman, FW, Hicks, K, Hleiqawi, I, Holtrop, M, Hyde, CE, Ilieva, Y, Ireland, DG, Ishkhanov, BS, Isupov, EL, Ito, MM, Jenkins, D, Jo, HS, Johnstone, JR, Joo, K, Juengst, HG, Kalantarians, N, Keller, D, Kellie, JD, Khandaker, M, Kim, KY, Klein, A, Klein, FJ, Klimenko, AV, Kossov, M, Krahn, Z, Kramer, LH, Kubarovsky, V, Kuhn, J, Kuhn, SE, Kuleshov, SV, Kuznetsov, V, Lachniet, J, Laget, JM, Langheinrich, J, Lawrence, D, Lee, T, Li, J, Lima, ACS, Livingston, K, Lu, HY, Lukashin, K, MacCormick, M, Markov, N, Mattione, P, McAleer, S, McKinnon, B, McNabb, JWC, Mecking, BA, Mehrabyan, S, Melone, JJ, Mestayer, MD, Meyer, CA, Mibe, T, Mikhailov, K, Minehart, R, Mirazita, M, Miskimen, R, Mokeev, V, Morand, L, Moreno, B, Moriya, K, Morrow, SA, Moteabbed, M, Mueller, J, Munevar, E, Mutchler, GS, Nadel-Turonski, P, Nasseripour, R, Niccolai, S, Niculescu, G, Niculescu, I, Niczyporuk, BB, Niroula, MR, Niyazov, RA, Nozar, M, O'Rielly, GV, Osipenko, M, Ostrovidov, AI, Park, S, Pasyuk, E, Paterson, C, Pereira, SA, Philips, SA, Pierce, J, Pivnyuk, N, Pocanic, D, Pogorelko, O, Polli, E, Popa, I, Pozdniakov, S, Preedom, BM, Price, JW, Prok, Y, Protopopescu, D, Qin, LM, Raue, BA, Riccardi, G, Ricco, G, Ripani, M, Ritchie, BG, Rosner, G, Rossi, P, Rowntree, D, Rubin, PD, Sabatie, F, Saini, MS, Salamanca, J, Salgado, C, Santoro, JP, Sapunenko, V, Schott, D, Schumacher, RA, Serov, VS, Sharabian, YG, Sharov, D, Shaw, J, Shvedunov, NV, Skabelin, AV, Smith, ES, Smith, LC, Sober, DI, Sokhan, D, Stavinsky, A, Stepanyan, SS, Stepanyan, S, Stokes, BE, Stoler, P, Strakovsky, II, Strauch, S, Suleiman, R, Taiuti, M, Takeuchi, T, Tedeschi, DJ, Tkabladze, A, Tkachenko, S, Todor, L, Tur, C, Ungaro, M, Vineyard, MF, Vlassov, AV, Watts, DP, Weinstein, LB, Weygand, DP, Williams, M, Wolin, E, Wood, MH, Yegneswaran, A, Yun, J, Yurov, M, Zana, L, Zhang, B, Zhang, J, Zhao, B & Zhao, ZW 2008, 'Electroexcitation of the Roper resonance for 1.7 Q(2) en pi(+)', Physical Review C, vol. 78, no. 4, 045209, pp. -. https://doi.org/10.1103/PhysRevC.78.045209

TY - JOUR

T1 - Electroexcitation of the Roper resonance for 1.7 Q(2) en pi(+)

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.

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PY - 2008/10

Y1 - 2008/10

N2 - The helicity amplitudes of the electroexcitation of the Roper resonance are extracted for 1.7 < Q(2)< 4.5 GeV2 from recent high precision JLab-CLAS cross section and longitudinally polarized beam asymmetry data for pi(+) 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 Q(2) behavior of the helicity amplitudes for the gamma(*)p -> N(1440)P-11 transition. It is found that the transverse helicity amplitude A(1/2), which is large and negative at Q(2)=0, becomes large and positive at Q(2)similar or equal to 2 GeV2, and then drops slowly with Q(2). The longitudinal helicity amplitude S-1/2, which was previously found from CLAS ep -> ep pi(0),en pi(+) data to be large and positive at Q(2)=0.4,0.65 GeV2, drops with Q(2). Available model predictions for gamma(*)p -> N(1440)P-11 allow us to conclude that these results provide strong evidence in favor of N(1440)P-11 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 Q(2)< 1 GeV2 that the presentation of N(1440)P-11 as a q(3)G hybrid state is ruled out.

AB - The helicity amplitudes of the electroexcitation of the Roper resonance are extracted for 1.7 < Q(2)< 4.5 GeV2 from recent high precision JLab-CLAS cross section and longitudinally polarized beam asymmetry data for pi(+) 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 Q(2) behavior of the helicity amplitudes for the gamma(*)p -> N(1440)P-11 transition. It is found that the transverse helicity amplitude A(1/2), which is large and negative at Q(2)=0, becomes large and positive at Q(2)similar or equal to 2 GeV2, and then drops slowly with Q(2). The longitudinal helicity amplitude S-1/2, which was previously found from CLAS ep -> ep pi(0),en pi(+) data to be large and positive at Q(2)=0.4,0.65 GeV2, drops with Q(2). Available model predictions for gamma(*)p -> N(1440)P-11 allow us to conclude that these results provide strong evidence in favor of N(1440)P-11 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 Q(2)< 1 GeV2 that the presentation of N(1440)P-11 as a q(3)G hybrid state is ruled out.

U2 - 10.1103/PhysRevC.78.045209

DO - 10.1103/PhysRevC.78.045209

M3 - Article

SN - 0556-2813

VL - 78

SP - -

JO - Physical Review C

JF - Physical Review C

IS - 4

M1 - 045209

ER -

Electroexcitation of the Roper resonance for 1.7 Q(2) en pi(+)

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