Measurements of ep→e'π+π-p' cross sections with CLAS at 1.40GeV<W<2.0 GeV and 2.0GeV2<Q2<5.0GeV2

doi:10.1103/PhysRevC.96.025209

Title: Measurements of $e p \to e^{'} π^{+} π^{-} p^{'}$ cross sections with CLAS at $1.40 GeV < W < 2.0$ GeV and $2.0 {GeV}^{2} < Q^{2} < 5.0 {GeV}^{2}$

Abstract

This paper reports new exclusive cross sections for $$e p \to e' \pi^+ \pi^- p'$$ using the CLAS detector at Jefferson Laboratory. These results are presented for the first time at photon virtualities 2.0 GeV ² < Q ² < 5.0 GeV ² in the center-of-mass energy range 1.4 GeV < W < 2.0 GeV, which covers a large part of the nucleon resonance region. Using a model developed for the phenomenological analysis of electroproduction data, we see strong indications that the relative contributions from the resonant cross sections at W < 1.74 GeV increase with $Q^2$. These data considerably extend the kinematic reach of previous measurements. Exclusive $$e p \to e' \pi^+ \pi^- p'$$ cross section measurements are of particular importance for the extraction of resonance electrocouplings in the mass range above 1.6 GeV.

Authors:: Isupov, E. L.; Burkert, V. D.; Carman, D. S.; Gothe, R. W.; Hicks, K.; Ishkhanov, B. S.; Mokeev, V. I.; Adhikari, K. P.; Adhikari, S.; Adikaram, D.; Akbar, Z.; Amaryan, M. J.; Anefalos Pereira, S.; Avakian, H.; Ball, J.; Baltzell, N. A.; Battaglieri, M.; Batourine, V.; Bedlinskiy, I.; Biselli, A. S. more »« less

Publication Date:: 2017-08-01

Research Org.:: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)

Contributing Org.:: CLAS Collaboration

OSTI Identifier:: 1377016

Report Number(s):: JLAB-PHY-17-2453; DOE/OR/23177-4130; arXiv:1705.01901
Journal ID: ISSN 2469-9985; PRVCAN

DOE Contract Number:: AC05-06OR23177

Resource Type:: Journal Article

Journal Name:: Physical Review C

Additional Journal Information:: Journal Volume: 96; Journal Issue: 2; Journal ID: ISSN 2469-9985

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats


                    Isupov, E. L., Burkert, V. D., Carman, D. S., Gothe, R. W., Hicks, K., Ishkhanov, B. S., Mokeev, V. I., Adhikari, K. P., Adhikari, S., Adikaram, D., Akbar, Z., Amaryan, M. J., Anefalos Pereira, S., Avakian, H., Ball, J., Baltzell, N. A., Battaglieri, M., Batourine, V., Bedlinskiy, I., Biselli, A. S., Briscoe, W. J., Brooks, W. K., Bültmann, S., Cao, T., Celentano, A., Charles, G., Chetry, T., Ciullo, G., Clark, L., Colaneri, L., Cole, P. L., Contalbrigo, M., Cortes, O., Crede, V., D'Angelo, A., Dashyan, N., De Vita, R., De Sanctis, E., Deur, A., Djalali, C., Dupre, R., El Alaoui, A., El Fassi, L., Elouadrhiri, L., Eugenio, P., Fedotov, G., Fersch, R., Filippi, A., Fleming, J. A., Forest, T. A., Garçon, M., Gavalian, G., Ghandilyan, Y., Gilfoyle, G. P., Giovanetti, K. L., Girod, F. X., Glazier, D. I., Gleason, C., Golovatch, E., Griffioen, K. A., Guidal, M., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Harrison, N., Hattawy, M., Heddle, D., Holtrop, M., Hughes, S. M., Ilieva, Y., Ireland, D. G., Jenkins, D., Jiang, H., Joo, K., Joosten, S., Keller, D., Khachatryan, G., Khandaker, M., Kim, A., Kim, W., Klein, A., Klein, F. J., Kubarovsky, V., Kuleshov, S. V., Kunkel, M., Lanza, L., Lenisa, P., Livingston, K., Lu, H. Y., MacGregor, I. J.  D., Markov, N., McKinnon, B., Mineeva, T., Mirazita, M., Montgomery, R. A., Movsisyan, A., Munevar, E., Munoz Camacho, C., Murdoch, G., Nadel-Turonski, P., Niccolai, S., Niculescu, G., Niculescu, I., Osipenko, M., Paolone, M., Paremuzyan, R., Park, K., Pasyuk, E., Phelps, W., Pogorelko, O., Price, J. W., Procureur, S., Prok, Y., Protopopescu, D., Raue, B. A., Ripani, M., Riser, D., Ritchie, B. G., Rizzo, A., Sabatié, F., Salgado, C., Schumacher, R. A., Sharabian, Y. G., Simonyan, A., Skorodumina, Iu., Smith, G. D., Sokhan, D., Sparveris, N., Stankovic, I., Strakovsky, I. I., Strauch, S., Taiuti, M., Tian, Ye, Torayev, B., Trivedi, A., Ungaro, M., Voskanyan, H., Voutier, E., Walford, N. K., Wei, X., Wood, M. H., Zachariou, N., and Zhang, J. Measurements of ep→e'π+π-p' cross sections with CLAS at 1.40GeV<W<2.0 GeV and 2.0GeV2<Q2<5.0GeV2.  United States: N. p., 2017. 
        Web.  doi:10.1103/PhysRevC.96.025209.

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                    Isupov, E. L., Burkert, V. D., Carman, D. S., Gothe, R. W., Hicks, K., Ishkhanov, B. S., Mokeev, V. I., Adhikari, K. P., Adhikari, S., Adikaram, D., Akbar, Z., Amaryan, M. J., Anefalos Pereira, S., Avakian, H., Ball, J., Baltzell, N. A., Battaglieri, M., Batourine, V., Bedlinskiy, I., Biselli, A. S., Briscoe, W. J., Brooks, W. K., Bültmann, S., Cao, T., Celentano, A., Charles, G., Chetry, T., Ciullo, G., Clark, L., Colaneri, L., Cole, P. L., Contalbrigo, M., Cortes, O., Crede, V., D'Angelo, A., Dashyan, N., De Vita, R., De Sanctis, E., Deur, A., Djalali, C., Dupre, R., El Alaoui, A., El Fassi, L., Elouadrhiri, L., Eugenio, P., Fedotov, G., Fersch, R., Filippi, A., Fleming, J. A., Forest, T. A., Garçon, M., Gavalian, G., Ghandilyan, Y., Gilfoyle, G. P., Giovanetti, K. L., Girod, F. X., Glazier, D. I., Gleason, C., Golovatch, E., Griffioen, K. A., Guidal, M., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Harrison, N., Hattawy, M., Heddle, D., Holtrop, M., Hughes, S. M., Ilieva, Y., Ireland, D. G., Jenkins, D., Jiang, H., Joo, K., Joosten, S., Keller, D., Khachatryan, G., Khandaker, M., Kim, A., Kim, W., Klein, A., Klein, F. J., Kubarovsky, V., Kuleshov, S. V., Kunkel, M., Lanza, L., Lenisa, P., Livingston, K., Lu, H. Y., MacGregor, I. J.  D., Markov, N., McKinnon, B., Mineeva, T., Mirazita, M., Montgomery, R. A., Movsisyan, A., Munevar, E., Munoz Camacho, C., Murdoch, G., Nadel-Turonski, P., Niccolai, S., Niculescu, G., Niculescu, I., Osipenko, M., Paolone, M., Paremuzyan, R., Park, K., Pasyuk, E., Phelps, W., Pogorelko, O., Price, J. W., Procureur, S., Prok, Y., Protopopescu, D., Raue, B. A., Ripani, M., Riser, D., Ritchie, B. G., Rizzo, A., Sabatié, F., Salgado, C., Schumacher, R. A., Sharabian, Y. G., Simonyan, A., Skorodumina, Iu., Smith, G. D., Sokhan, D., Sparveris, N., Stankovic, I., Strakovsky, I. I., Strauch, S., Taiuti, M., Tian, Ye, Torayev, B., Trivedi, A., Ungaro, M., Voskanyan, H., Voutier, E., Walford, N. K., Wei, X., Wood, M. H., Zachariou, N., & Zhang, J. Measurements of ep→e'π+π-p' cross sections with CLAS at 1.40GeV<W<2.0 GeV and 2.0GeV2<Q2<5.0GeV2.  United States.  doi:10.1103/PhysRevC.96.025209.

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                    Isupov, E. L., Burkert, V. D., Carman, D. S., Gothe, R. W., Hicks, K., Ishkhanov, B. S., Mokeev, V. I., Adhikari, K. P., Adhikari, S., Adikaram, D., Akbar, Z., Amaryan, M. J., Anefalos Pereira, S., Avakian, H., Ball, J., Baltzell, N. A., Battaglieri, M., Batourine, V., Bedlinskiy, I., Biselli, A. S., Briscoe, W. J., Brooks, W. K., Bültmann, S., Cao, T., Celentano, A., Charles, G., Chetry, T., Ciullo, G., Clark, L., Colaneri, L., Cole, P. L., Contalbrigo, M., Cortes, O., Crede, V., D'Angelo, A., Dashyan, N., De Vita, R., De Sanctis, E., Deur, A., Djalali, C., Dupre, R., El Alaoui, A., El Fassi, L., Elouadrhiri, L., Eugenio, P., Fedotov, G., Fersch, R., Filippi, A., Fleming, J. A., Forest, T. A., Garçon, M., Gavalian, G., Ghandilyan, Y., Gilfoyle, G. P., Giovanetti, K. L., Girod, F. X., Glazier, D. I., Gleason, C., Golovatch, E., Griffioen, K. A., Guidal, M., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Harrison, N., Hattawy, M., Heddle, D., Holtrop, M., Hughes, S. M., Ilieva, Y., Ireland, D. G., Jenkins, D., Jiang, H., Joo, K., Joosten, S., Keller, D., Khachatryan, G., Khandaker, M., Kim, A., Kim, W., Klein, A., Klein, F. J., Kubarovsky, V., Kuleshov, S. V., Kunkel, M., Lanza, L., Lenisa, P., Livingston, K., Lu, H. Y., MacGregor, I. J.  D., Markov, N., McKinnon, B., Mineeva, T., Mirazita, M., Montgomery, R. A., Movsisyan, A., Munevar, E., Munoz Camacho, C., Murdoch, G., Nadel-Turonski, P., Niccolai, S., Niculescu, G., Niculescu, I., Osipenko, M., Paolone, M., Paremuzyan, R., Park, K., Pasyuk, E., Phelps, W., Pogorelko, O., Price, J. W., Procureur, S., Prok, Y., Protopopescu, D., Raue, B. A., Ripani, M., Riser, D., Ritchie, B. G., Rizzo, A., Sabatié, F., Salgado, C., Schumacher, R. A., Sharabian, Y. G., Simonyan, A., Skorodumina, Iu., Smith, G. D., Sokhan, D., Sparveris, N., Stankovic, I., Strakovsky, I. I., Strauch, S., Taiuti, M., Tian, Ye, Torayev, B., Trivedi, A., Ungaro, M., Voskanyan, H., Voutier, E., Walford, N. K., Wei, X., Wood, M. H., Zachariou, N., and Zhang, J. Tue .  
        "Measurements of ep→e'π+π-p' cross sections with CLAS at 1.40GeV<W<2.0 GeV and 2.0GeV2<Q2<5.0GeV2".  United States.  doi:10.1103/PhysRevC.96.025209.  https://www.osti.gov/servlets/purl/1377016.

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@article{osti_1377016,

  title        = {Measurements of ep→e'π+π-p' cross sections with CLAS at 1.40GeV<W<2.0 GeV and 2.0GeV2<Q2<5.0GeV2},

  author       = {Isupov, E. L. and Burkert, V. D. and Carman, D. S. and Gothe, R. W. and Hicks, K. and Ishkhanov, B. S. and Mokeev, V. I. and Adhikari, K. P. and Adhikari, S. and Adikaram, D. and Akbar, Z. and Amaryan, M. J. and Anefalos Pereira, S. and Avakian, H. and Ball, J. and Baltzell, N. A. and Battaglieri, M. and Batourine, V. and Bedlinskiy, I. and Biselli, A. S. and Briscoe, W. J. and Brooks, W. K. and Bültmann, S. and Cao, T. and Celentano, A. and Charles, G. and Chetry, T. and Ciullo, G. and Clark, L. and Colaneri, L. and Cole, P. L. and Contalbrigo, M. and Cortes, O. and Crede, V. and D'Angelo, A. and Dashyan, N. and De Vita, R. and De Sanctis, E. and Deur, A. and Djalali, C. and Dupre, R. and El Alaoui, A. and El Fassi, L. and Elouadrhiri, L. and Eugenio, P. and Fedotov, G. and Fersch, R. and Filippi, A. and Fleming, J. A. and Forest, T. A. and Garçon, M. and Gavalian, G. and Ghandilyan, Y. and Gilfoyle, G. P. and Giovanetti, K. L. and Girod, F. X. and Glazier, D. I. and Gleason, C. and Golovatch, E. and Griffioen, K. A. and Guidal, M. and Guo, L. and Hafidi, K. and Hakobyan, H. and Hanretty, C. and Harrison, N. and Hattawy, M. and Heddle, D. and Holtrop, M. and Hughes, S. M. and Ilieva, Y. and Ireland, D. G. and Jenkins, D. and Jiang, H. and Joo, K. and Joosten, S. and Keller, D. and Khachatryan, G. and Khandaker, M. and Kim, A. and Kim, W. and Klein, A. and Klein, F. J. and Kubarovsky, V. and Kuleshov, S. V. and Kunkel, M. and Lanza, L. and Lenisa, P. and Livingston, K. and Lu, H. Y. and MacGregor, I. J.  D. and Markov, N. and McKinnon, B. and Mineeva, T. and Mirazita, M. and Montgomery, R. A. and Movsisyan, A. and Munevar, E. and Munoz Camacho, C. and Murdoch, G. and Nadel-Turonski, P. and Niccolai, S. and Niculescu, G. and Niculescu, I. and Osipenko, M. and Paolone, M. and Paremuzyan, R. and Park, K. and Pasyuk, E. and Phelps, W. and Pogorelko, O. and Price, J. W. and Procureur, S. and Prok, Y. and Protopopescu, D. and Raue, B. A. and Ripani, M. and Riser, D. and Ritchie, B. G. and Rizzo, A. and Sabatié, F. and Salgado, C. and Schumacher, R. A. and Sharabian, Y. G. and Simonyan, A. and Skorodumina, Iu. and Smith, G. D. and Sokhan, D. and Sparveris, N. and Stankovic, I. and Strakovsky, I. I. and Strauch, S. and Taiuti, M. and Tian, Ye and Torayev, B. and Trivedi, A. and Ungaro, M. and Voskanyan, H. and Voutier, E. and Walford, N. K. and Wei, X. and Wood, M. H. and Zachariou, N. and Zhang, J.},

  abstractNote = {This paper reports new exclusive cross sections for $e p \to e' \pi^+ \pi^- p'$ using the CLAS detector at Jefferson Laboratory. These results are presented for the first time at photon virtualities 2.0 GeV2 < Q2 < 5.0 GeV2 in the center-of-mass energy range 1.4 GeV < W < 2.0 GeV, which covers a large part of the nucleon resonance region. Using a model developed for the phenomenological analysis of electroproduction data, we see strong indications that the relative contributions from the resonant cross sections at W < 1.74 GeV increase with $Q^2$. These data considerably extend the kinematic reach of previous measurements. Exclusive $e p \to e' \pi^+ \pi^- p'$ cross section measurements are of particular importance for the extraction of resonance electrocouplings in the mass range above 1.6 GeV.},

  doi          = {10.1103/PhysRevC.96.025209},

  journal      = {Physical Review C},

  issn         = {2469-9985},

  number       = 2,

  volume       = 96,

  place        = {United States},

  year         = {2017},

  month        = {8}

}

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Full Text Available
Measurements of the $γ_{v} p \to p^{'} π^{+} π^{-}$ cross section with the CLAS detector for $0.4 {GeV}^{2} < Q^{2} < 1.0 {GeV}^{2}$ and $1.3 GeV < W < 1.825 GeV$

Journal Article Fedotov, G. V. ; Skorodumina, Iu. A. ; Burkert, V. D. ; ... - Physical Review C

New results on the single-differential and fully-integrated cross sections for the processmore »« less
Cited by 4
DOI: 10.1103/PhysRevC.98.025203

Full Text Available
Measurements of the $γ_{v} p \to p^{'} π^{+} π^{-}$ cross section with the CLAS detector for $0.4 {GeV}^{2} < Q^{2} < 1.0 {GeV}^{2}$ and $1.3 GeV < W < 1.825 GeV$

Journal Article Fedotov, G. V. ; Skorodumina, Iu. A. ; Burkert, V. D. ; ... - Physical Review C

New results on the single-differential and fully-integrated cross sections for the processmore »« less
Cited by 4
DOI: 10.1103/PhysRevC.98.025203

Full Text Available
Measurements of the $γ_{v} p \to p^{'} π^{+} π^{-}$ cross section with the CLAS detector for $0.4 {GeV}^{2} < Q^{2} < 1.0 {GeV}^{2}$ and $1.3 GeV < W < 1.825 GeV$

Journal Article Fedotov, G. V. ; Skorodumina, Iu. A. ; Burkert, V. D. ; ... - Physical Review C

New results on the single-differential and fully integrated cross sections for the process gamma(upsilon)p -> p'pi(+)pi(-) are presented. The experimental data were collected with the CLAS detector at Jefferson Laboratory. Measurements were carried out in the kinematic region of the reaction invariant mass W from 1.3 to 1.825 GeV and the photon virtuality Q(2) from 0.4 to 1.0 GeV2. The cross sections were obtained in narrow Q(2) bins (0.05 GeV2) with the smallest statistical uncertainties achieved in double-pion electroproduction experiments to date. The results were found to be in agreement with previously available data where they overlap. A preliminary interpretationmore »« less
Cited by 4
DOI: 10.1103/PhysRevC.98.025203

Full Text Available

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Title: Measurements of e p → e ' π + π - p ' cross sections with CLAS at 1.40 GeV < W < 2.0 GeV and 2.0 GeV 2 < Q 2 < 5.0 GeV 2

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Updates on the Studies of $${\varvec{N}}^\mathbf{*}$$ N ∗ Structure with CLAS and the Prospects with CLAS12 journal, June 2016

Q 2 dependence of the S 11 ( 1535 ) photocoupling and evidence for a P -wave resonance in η electroproduction journal, July 2007

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Model analysis of the ep → e ' p π + π − electroproduction reaction on the proton journal, October 2009

The CEBAF large acceptance spectrometer (CLAS) journal, May 2003

Properties of baryon resonances from a multichannel partial wave analysis journal, February 2012

Completing the Picture of the Roper Resonance journal, October 2015

Isospin decomposition of γ N → N * transitions within a dynamical coupled-channels model journal, July 2016

Radiative Corrections to Elastic and Inelastic ep and up Scattering journal, January 1969

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Recent results on the nucleon resonance spectrum and structure from the CLAS detector journal, January 2016

Electroexcitation of nucleon resonances journal, January 2012

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New results from the studies of the N ( 1440 ) 1 / 2 + , N ( 1520 ) 3 / 2 − , and Δ ( 1620 ) 1 / 2 − resonances in exclusive e p → e ′ p ′ π + π − electroproduction with the CLAS detector journal, February 2016

Three Lectures on Hadron Physics journal, April 2016

Electroexcitation of nucleon resonances at Q 2 = 0 . 65 ( GeV / c ) 2 from a combined analysis of single- and double-pion electroproduction data journal, October 2005

Extraction of electromagnetic transition form factors for nucleon resonances within a dynamical coupled-channels model journal, October 2010

Electroproduction of the N * ( 1535 ) nucleon resonance in QCD journal, July 2015

Experimental study of the P 11 ( 1440 ) and D 13 ( 1520 ) resonances from the CLAS data on e p → e ′ π + π − p ′ journal, September 2012

Measurement of e p → e ′ p π + π − and Baryon Resonance Analysis journal, July 2003

Energy-independent PWA of the reaction γp → K+Λ journal, August 2014

Nucleon resonances within a dynamical coupled-channels model of π N and γ N reactions journal, September 2013

Light-cone distribution amplitudes of the nucleon and negative parity nucleon resonances from lattice QCD journal, May 2014

Nucleon and $${\Delta}$$ Δ Elastic and Transition Form Factors journal, October 2014

Empirical fit to the nucleon electromagnetic form factors journal, January 1995

Electroexcitation of nucleon resonances from CLAS data on single pion electroproduction journal, November 2009

Measurements of e p → e ′ π + n at 1.6 < W < 2.0 GeV and extraction of nucleon resonance electrocouplings at CLAS journal, April 2015

Title: Measurements of $e p \to e^{'} π^{+} π^{-} p^{'}$ cross sections with CLAS at $1.40 GeV < W < 2.0$ GeV and $2.0 {GeV}^{2} < Q^{2} < 5.0 {GeV}^{2}$

Updates on the Studies of $${\varvec{N}}^\mathbf{*}$$ N ∗ Structure with CLAS and the Prospects with CLAS12
journal, June 2016

$Q^{2}$ dependence of the $S_{11} (1535)$ photocoupling and evidence for a $P$ -wave resonance in η electroproduction
journal, July 2007

Extracting meson-baryon contributions to the electroexcitation of the $N (1675) {\frac{5}{2}}^{-}$ nucleon resonance
journal, July 2015

Explanation and prediction of observables using continuum strong QCD
journal, July 2014

Electroproduction of $p π^{+} π^{-}$ off protons at $0.2 < Q^{2} < 0.6$ ${GeV}^{2}$ and $1.3 < W < 1.57$ GeV with the CLAS detector
journal, January 2009

Model analysis of the $ep \to e^{'} p π^{+} π^{-}$ electroproduction reaction on the proton
journal, October 2009

The CEBAF large acceptance spectrometer (CLAS)
journal, May 2003

Properties of baryon resonances from a multichannel partial wave analysis
journal, February 2012

Completing the Picture of the Roper Resonance
journal, October 2015

Isospin decomposition of $γ N \to N^{*}$ transitions within a dynamical coupled-channels model
journal, July 2016

Radiative Corrections to Elastic and Inelastic $ep$ and $up$ Scattering
journal, January 1969

Studies of n* Structure from the clas Meson Electroproduction data
journal, January 2014

Recent results on the nucleon resonance spectrum and structure from the CLAS detector
journal, January 2016

Electroexcitation of nucleon resonances
journal, January 2012

Phenomenological model for describing pion-pair production on a proton by virtual photons in the energy region of nucleon-resonance excitation
journal, July 2001

Review of Particle Physics
journal, August 2014

A phenomenological description of photo- and electroproduction in nucleon resonance region
journal, June 2000

Studies of Nucleon Resonance Structure in Exclusive Meson Electroproduction
journal, June 2013

New results from the studies of the $N (1440) 1 / 2^{+}, N (1520) 3 / 2^{-}$ , and $Δ (1620) 1 / 2^{-}$ resonances in exclusive $e p \to e^{'} p^{'} π^{+} π^{-}$ electroproduction with the CLAS detector
journal, February 2016

Three Lectures on Hadron Physics
journal, April 2016

Electroexcitation of nucleon resonances at $Q^{2} = 0.65 (GeV / c)^{2}$ from a combined analysis of single- and double-pion electroproduction data
journal, October 2005

Extraction of electromagnetic transition form factors for nucleon resonances within a dynamical coupled-channels model
journal, October 2010

Electroproduction of the $N^{*} (1535)$ nucleon resonance in QCD
journal, July 2015

Experimental study of the $P_{11} (1440)$ and $D_{13} (1520)$ resonances from the CLAS data on $e p \to e^{'} π^{+} π^{-} p^{'}$
journal, September 2012

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journal, July 2003

Energy-independent PWA of the reaction γp → K+Λ
journal, August 2014

Nucleon resonances within a dynamical coupled-channels model of $π N$ and $γ N$ reactions
journal, September 2013

Light-cone distribution amplitudes of the nucleon and negative parity nucleon resonances from lattice QCD
journal, May 2014

Nucleon and $${\Delta}$$ Δ Elastic and Transition Form Factors
journal, October 2014

Empirical fit to the nucleon electromagnetic form factors
journal, January 1995

Electroexcitation of nucleon resonances from CLAS data on single pion electroproduction
journal, November 2009

Measurements of $e p \to e^{'} π^{+} n$ at $1.6 < W < 2.0$ GeV and extraction of nucleon resonance electrocouplings at CLAS
journal, April 2015