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dc.contributor.authorSuleiman, R.
dc.date.accessioned2011-06-15T13:01:46Z
dc.date.available2011-06-15T13:01:46Z
dc.date.issued2009-11
dc.date.submitted2009-09
dc.identifier.issn0556-2813
dc.identifier.urihttp://hdl.handle.net/1721.1/64432
dc.description.abstractWe present results on the electroexcitation of the low mass resonances Δ(1232)P[subscript 33], N(1440)P[subscript 11], N(1520)D[subscript 13], and N(1535)S11 in a wide range of Q[superscript 2]. The results were obtained in the comprehensive analysis of data from the Continuous Electron Beam Accelerator Facility (CEBAF) large acceptance spectrometer (CLAS) detector at the Thomas Jefferson National Accelerator Facility (JLab) on differential cross sections, longitudinally polarized beam asymmetries, and longitudinal target and beam-target asymmetries for π electroproduction off the proton. The data were analyzed using two conceptually different approaches—fixed-t dispersion relations and a unitary isobar model—allowing us to draw conclusions on the model sensitivity of the obtained electrocoupling amplitudes. The amplitudes for the Δ(1232)P[subscript 33] show the importance of a meson-cloud contribution to quantitatively explain the magnetic dipole strength, as well as the electric and scalar quadrupole transitions. They do not show any tendency of approaching the pQCD regime for Q[superscript 2] ≦ 6 GeV2. For the Roper resonance, N(1440)P[subscript 11], the data provide strong evidence that this state is a predominantly radial excitation of a three-quark (3q) ground state. Measured in pion electroproduction, the transverse helicity amplitude for the N(1535)S[subscript 11] allowed us to obtain the branching ratios of this state to the πN and ηN channels via comparison with the results extracted from η electroproduction. The extensive CLAS data also enabled the extraction of the γ ∗ p → N(1520)D[subscript 13] and N(1535)S[subscript 11] longitudinal helicity amplitudes with good precision. For the N(1535)S[subscript 11], these results became a challenge for quark models and may be indicative of large meson-cloud contributions or of representations of this state that differ from a 3q excitation. The transverse amplitudes for the N(1520)D[subscript 13] clearly show the rapid changeover from helicity-3/2 dominance at the real photon point to helicity-1/2 dominance at Q2 > 1 GeV[superscript 2], confirming a long-standing prediction of the constituent quark model.en_US
dc.description.sponsorshipUnited States. Dept. of Energyen_US
dc.description.sponsorshipNational Science Foundation (U.S.)en_US
dc.description.sponsorshipKorean Research Foundationen_US
dc.description.sponsorshipInstitut national de physique nucléaire et de physique des particules (CNRS/IN2P3)en_US
dc.description.sponsorshipIstituto nazionale di fisica nucleareen_US
dc.description.sponsorshipSkobeltsyn Institute of Nuclear Physicsen_US
dc.description.sponsorshipScience and Technology Facilities Council (Great Britain)en_US
dc.language.isoen_US
dc.publisherAmerican Physical Societyen_US
dc.relation.isversionofhttp://dx.doi.org/10.1103/PhysRevC.80.055203en_US
dc.rightsArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.en_US
dc.sourceAPSen_US
dc.titleElectroexcitation of nucleon resonances from CLAS data on single pion electroproductionen_US
dc.typeArticleen_US
dc.identifier.citationCLAS Collaboration et al. “Electroexcitation of Nucleon Resonances from CLAS Data on Single Pion Electroproduction.” Physical Review C 80.5 (2009) : 055203. © 2009 The American Physical Societyen_US
dc.contributor.approverSuleiman, R.
dc.contributor.mitauthorSuleiman, R.
dc.relation.journalPhysical Review Cen_US
dc.eprint.versionFinal published versionen_US
dc.type.urihttp://purl.org/eprint/type/JournalArticleen_US
eprint.statushttp://purl.org/eprint/status/PeerRevieweden_US
dspace.orderedauthorsAznauryan, I. G.; Burkert, V. D.; Biselli, A. S.; Egiyan, H.; Joo, K.; Kim, W.; Park, K.; Smith, L. C.; Ungaro, M.; Adhikari, K. P.; Anghinolfi, M.; Avakian, H.; Ball, J.; Battaglieri, M.; Batourine, V.; Bedlinskiy, I.; Bellis, M.; Bookwalter, C.; Branford, D.; Briscoe, W. J.; Brooks, W. K.; Careccia, S. L.; Carman, D. S.; Cole, P. L.; Collins, P.; Crede, V.; D’Angelo, A.; Daniel, A.; Vita, R. De; Sanctis, E. De; Deur, A.; Dey, B.; Dhamija, S.; Dickson, R.; Djalali, C.; Doughty, D.; Dupre, R.; Alaoui, A. El; Elouadrhiri, L.; Eugenio, P.; Fedotov, G.; Fegan, S.; Forest, T. A.; Gabrielyan, M. Y.; Gilfoyle, G. P.; Giovanetti, K. L.; Girod, F. X.; Goetz, J. T.; Gohn, W.; Golovatch, E.; Gothe, R. W.; Guidal, M.; Guo, L.; Hafidi, K.; Hakobyan, H.; Hanretty, C.; Hassall, N.; Heddle, D.; Hicks, K.; Holtrop, M.; Hyde, C. E.; Ilieva, Y.; Ireland, D. G.; Ishkhanov, B. S.; Isupov, E. L.; Jawalkar, S. S.; Jo, H. S.; Johnstone, J. R.; Keller, D.; Khandaker, M.; Khetarpal, P.; Klein, A.; Klein, F. J.; Kramer, L. H.; Kubarovsky, V.; Kuhn, S. E.; Kuleshov, S. V.; Kuznetsov, V.; Livingston, K.; Lu, H. Y.; Mayer, M.; McAndrew, J.; McCracken, M. E.; McKinnon, B.; Meyer, C. A.; Mineeva, T.; Mirazita, M.; Mokeev, V.; Moreno, B.; Moriya, K.; Morrison, B.; Moutarde, H.; Munevar, E.; Nadel-Turonski, P.; Nasseripour, R.; Nepali, C. S.; Niccolai, S.; Niculescu, G.; Niculescu, I.; Niroula, M. R.; Osipenko, M.; Ostrovidov, A. I.; Park, S.; Pasyuk, E.; Pereira, S. Anefalos; Pisano, S.; Pogorelko, O.; Pozdniakov, S.; Price, J. W.; Procureur, S.; Prok, Y.; Protopopescu, D.; Raue, B. A.; Ricco, G.; Ripani, M.; Ritchie, B. G.; Rosner, G.; Rossi, P.; Sabatié, F.; Saini, M. S.; Salamanca, J.; Schumacher, R. A.; Seraydaryan, H.; Shvedunov, N. V.; Sober, D. I.; Sokhan, D.; Stepanyan, S. S.; Stoler, P.; Strakovsky, I. I.; Strauch, S.; Suleiman, R.; Taiuti, M.; Tedeschi, D. J.; Tkachenko, S.; Vineyard, M. F.; Watts, D. P.; Weinstein, L. B.; Weygand, D. P.; Williams, M.; Wood, M. H.; Zana, L.; Zhang, J.; Zhao, B.en
mit.licensePUBLISHER_POLICYen_US
mit.metadata.statusComplete


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