Skip to main content
Log in

Nucleon Resonance Structure from Exclusive Meson Electroproduction with CLAS

  • Published:
Few-Body Systems Aims and scope Submit manuscript

Abstract

Studies of the nucleon resonance electroexcitation amplitudes in a wide range of photon virtualities offer unique information on many facets of strong QCD behind the generation of all prominent excited nucleon states of distinctively different structure. Advances in the evaluation of resonance electroexcitation amplitudes from the data measured with the CLAS detector and the future extension of these studies with the CLAS12 detector at Jefferson Lab are presented. For the first time, analyses of \(\pi ^0p\), \(\pi ^+n\), \(\eta p\), and \(\pi ^+\pi ^-p\) electroproduction off proton channels have provided electroexcitation amplitudes of most resonances in the mass range up to 1.8 GeV and at photon virtualities \(Q^2 < 5\) GeV\(^2\). Consistent results on resonance electroexcitation amplitudes determined from different exclusive channels validate a credible extraction of these fundamental quantities. Studies of the resonance electroexcitation amplitudes revealed the \(N^*\) structure as a complex interplay between the inner core of three dressed quarks and the external meson–baryon cloud. The successful description of the \(\varDelta (1232)3/2^+\) and \(N(1440)1/2^+\) electrocouplings achieved within the Dyson–Schwinger Equation approach under a traceable connection to the QCD Lagrangian and supported by the novel light front quark model demonstrated the relevance of dressed quarks with dynamically generated masses as an active structural component in baryons. Future experiments with the CLAS12 detector will offer insight into the structure of all prominent resonances at the highest photon virtualities, \(Q^2 < 12\) GeV\(^2\), ever achieved in exclusive reactions, thus addressing the most challenging problems of the Standard Model on the nature of hadron mass, quark–gluon confinement, and the emergence of nucleon resonance structures from QCD. A search for new states of hadronic matter, the so-called hybrid-baryons with glue as a structural component, will complete the long term efforts on the resonance spectrum exploration.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

References

  1. D. Binosi et al., Phys. Rev. D 96, 054026 (2017)

    Article  ADS  Google Scholar 

  2. V.D. Burkert, The 11th International Workshop on the Physics of Excited Nucleons - N*2017. See these proceedings (2017)

  3. C.D. Roberts, The 11th International Workshop on the Physics of Excited Nucleons - N*2017. See these proceedings (2017)

  4. I.G. Aznauryan, V.D. Burkert, Prog. Part. Nucl. Phys. 67, 1 (2012)

    Article  ADS  Google Scholar 

  5. V.D. Burkert, C.D. Roberts, arXiv:1710.02549 [nucl-ex] (2017)

  6. I.G. Aznauryan, Phys. Rev. C 76, 025212 (2007)

    Article  ADS  Google Scholar 

  7. I.G. Aznauryan, V.D. Burkert, Phys. Rev. C 85, 055202 (2012)

    Article  ADS  Google Scholar 

  8. I.G. Aznauryan, V.D. Burkert, Phys. Rev. C 95, 065207 (2017)

    Article  ADS  Google Scholar 

  9. I.T. Obukhovsky et al., Phys. Rev. D 84, 014004 (2011)

    Article  ADS  Google Scholar 

  10. T. Gutsche, V.E. Lyubovitskij, I. Schmidt arXiv:1712.08410 [hep-ph] (2017)

  11. M.M. Giannini, E. Santopinto, Chin. J. Phys. 53, 020301 (2015)

    Google Scholar 

  12. N. Suzuki, T. Sato, T.-S.H. Lee, Phys. Rev. C 82, 045206 (2010)

    Article  ADS  Google Scholar 

  13. V.M. Braun et al., Phys. Rev. D 89, 094511 (2014)

    Article  ADS  Google Scholar 

  14. I.V. Anikin et al., Phys. Rev. D 92, 014018 (2015)

    Article  ADS  Google Scholar 

  15. C. Mezrag et al., arXiv:1711.09101 [nucl-th] (2017)

  16. I. Aznauryan et al., Phys. Rev. C 80, 055203 (2009)

    Article  ADS  Google Scholar 

  17. C.D. Roberts, Few Body Syst. 58, 5 (2017)

    Article  ADS  Google Scholar 

  18. J. Segovia et al., Few Body Syst. 55, 1185 (2015)

    Article  ADS  Google Scholar 

  19. J. Segovia et al., Phys. Rev. Lett. 115, 171801 (2015)

    Article  ADS  Google Scholar 

  20. D. Binosi et al., Phys. Rev. D 95, 031501 (2017)

    Article  ADS  Google Scholar 

  21. C. Chen et al., arXiv:1711.03142 [nucl-th] (2017)

  22. C.D. Roberts, J. Phys. Conf. Ser. 706, 022003 (2016)

    Article  Google Scholar 

  23. The 2015 Long Range Plan for Nuclear Science. https://science.energy.gov/~/media/np/nsac/pdf/2015LRP/2015_LRPNS_091815.pdf

  24. CLAS physics database. http://clasweb.jlab.org/physicsdb

  25. H. Kamano, The 11th International Workshop on the Physics of Excited Nucleons - N* 2017. See these proceedings (2017)

  26. K. Park et al., (CLAS Collaboration), Phys. Rev. C 91, 045203 (2015)

  27. I.G. Aznauryan, Phys. Rev. C 68, 065204 (2003)

    Article  ADS  Google Scholar 

  28. M. Ripani et al., (CLAS Collaboration), Phys. Rev. Lett. 91, 022002 (2003)

  29. G.V. Fedotov et al., (CLAS Collaboration), Phys. Rev. C 79, 014204 (2009)

  30. E.L. Isupov et al., (CLAS Collaboration), Phys. Rev. C 96, 025209 (2017)

  31. V.I. Mokeev et al., Phys. Rev. C 80, 045212 (2009)

    Article  ADS  Google Scholar 

  32. V.I. Mokeev et al., (CLAS Collaboration), Phys. Rev. C 86, 055203 (2012)

  33. V.I. Mokeev et al., Phys. Rev. C 93, 025206 (2016)

    Article  ADS  Google Scholar 

  34. Nucleon Resonance Photo-/Electrocouplings Determined from Analyses of Experimental Data on Exclusive Meson Electroproduction off Protons. https://userweb.jlab.org/~mokeev/resonance_electrocouplings/

  35. Fit of the Resonance Electrocouplings. https://userweb.jlab.org/~isupov/couplings/

  36. C. Patrignani et al., (Particle Data Group), Chin. Phys. C 40(10), 100001 (2016)

  37. M. Dugger et al., (CLAS Collaboration), Phys. Rev. C 79, 065206 (2009)

  38. A.V. Anisovich et al., Eur. Phys. J. A 48, 15 (2012)

    Article  ADS  Google Scholar 

  39. A.V. Anisovich et al., Eur. Phys. J. A 50, 129 (2014)

    Article  ADS  Google Scholar 

  40. D.S. Carman, The 11th International Workshop on the Physics of Excited Nucleons - N*2017. See these proceedings (2017)

  41. B. Julia-Diaz et al., Phys. Rev. C 77, 045205 (2008)

    Article  ADS  Google Scholar 

  42. E. Santopinto, M.M. Giannini, Phys. Rev. C 86, 065202 (2012)

    Article  ADS  Google Scholar 

  43. See CLAS12 webpage at http://www.jlab.org/Hall-B/clas12-web

  44. I.G. Aznauryan et al., Int. J. Mod. Phys. E 22, 1330015 (2013)

    Article  ADS  Google Scholar 

  45. A. D’Angelo, V.D. Burkert, D.S. Carman, E. Golovatch, R. Gothe, V. Mokeev, A Search for Hybrid Baryons in Hall B with CLAS12, JLab Experiment E12-09-003

  46. J.J. Dudek, R.G. Edwards, Phys. Rev. D 85, 054016 (2012)

    Article  ADS  Google Scholar 

  47. V. Mathieu, G. Fox, A.P. Szczepaniak, Phys. Rev. D 92, 074013 (2015)

    Article  ADS  Google Scholar 

  48. I. Strakovsky et al., EPJ Web Conf. 73, 04003 (2014)

    Article  Google Scholar 

  49. H. Kamano, S.X. Nakamura, T.-S.H. Lee, Phys. Rev. C 88, 035209 (2013)

    Article  ADS  Google Scholar 

  50. V.D. Burkert, P. Cole, R. Gothe, K. Joo, V. Mokeev, P. Stoler, Nucleon Resonance Studies with CLAS12, JLab Experiment E12-09-003

  51. D.S. Carman, R. Gothe, V. Mokeev, Exclusive \(N^* \rightarrow KY\) Studies with CLAS12, JLab Experiment E12-06-108A

  52. D.S. Carman, R. Gothe, V. Mokeev, Nucleon Resonance Structure Studies Via Exclusive \(KY\) Electroproduction at 6.6 GeV and 8.8 GeV, JLab Experiment E12-16-010A

  53. R. Briceno, The 11th International Workshop on the Physics of Excited Nucleons - N*2017. See these proceedings (2017)

  54. N. Isgur, in Why N\(^*\) are important, ed. by V.D. Burkert, L. Elouadrhiri, J.J. Kelly, R.C. Minehart, Proceedings of the NSTAR2000 Conference, 16–19 Feb 2000, Newport News, USA, vol 403 (World Scientific, 2001)

Download references

Author information

Authors and Affiliations

Authors

Corresponding author

Correspondence to Victor I. Mokeev.

Additional information

This article belongs to the Topical Collection “NSTAR 2017 - The International Workshop on the Physics of Excited Nucleons”.

Victor I. Mokeev: for the CLAS Collaboration.

Rights and permissions

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Mokeev, V.I. Nucleon Resonance Structure from Exclusive Meson Electroproduction with CLAS. Few-Body Syst 59, 46 (2018). https://doi.org/10.1007/s00601-018-1369-8

Download citation

  • Received:

  • Accepted:

  • Published:

  • DOI: https://doi.org/10.1007/s00601-018-1369-8

Navigation