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Electromagnetic excitations of baryon resonances

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Title: Electromagnetic excitations of baryon resonances
Authors: Burkert, Volker D.1 burkert@jlab.org
Source: Progress in Particle & Nuclear Physics. Jun2005, Vol. 55 Issue 1, p108-130. 23p.
Subjects: Particles (Nuclear physics), Nuclear magnetic resonance, Spectrometers, Baryons
Abstract: Abstract: I will discuss recent results on the electromagnetic excitation of non-strange baryon resonances obtained with the CEBAF Large Acceptance Spectrometer (CLAS). Preliminary data on the transition multipoles at small and at large photon virtualities are presented, showing the importance of the nucleon pion cloud. In the second nucleon resonance region, new results on the transition amplitudes for the Roper , the , and the states are presented. The transverse Roper photocoupling amplitude shows a strong dependence that is best described in terms of large meson cloud contributions. The helicity amplitudes for the are extracted from both single pion production as well as eta production, giving consistent results. In contrast to the Roper resonance, a nearly -independent behavior is observed at small values supporting the interpretation of this state as a nearly pure three-quark resonance. The amplitudes show the rapid change of the helicity structure predicted by non-relativistic quark models. Searches for new baryon states in two-pion photoproduction and electroproduction show consistently a need for a new state near 1.72 GeV with . Finally, the search for the and other pentaquark baryon states with CLAS is presented. [Copyright &y& Elsevier]
Copyright of Progress in Particle & Nuclear Physics is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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Header DbId: egs
DbLabel: Engineering Source
An: 17990995
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Electromagnetic excitations of baryon resonances
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  Data: <searchLink fieldCode="AR" term="%22Burkert%2C+Volker+D%2E%22">Burkert, Volker D.</searchLink><relatesTo>1</relatesTo><i> burkert@jlab.org</i>
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  Data: <searchLink fieldCode="JN" term="%22Progress+in+Particle+%26+Nuclear+Physics%22">Progress in Particle & Nuclear Physics</searchLink>. Jun2005, Vol. 55 Issue 1, p108-130. 23p.
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  Data: <searchLink fieldCode="DE" term="%22Particles+%28Nuclear+physics%29%22">Particles (Nuclear physics)</searchLink><br /><searchLink fieldCode="DE" term="%22Nuclear+magnetic+resonance%22">Nuclear magnetic resonance</searchLink><br /><searchLink fieldCode="DE" term="%22Spectrometers%22">Spectrometers</searchLink><br /><searchLink fieldCode="DE" term="%22Baryons%22">Baryons</searchLink>
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  Label: Abstract
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  Data: Abstract: I will discuss recent results on the electromagnetic excitation of non-strange baryon resonances obtained with the CEBAF Large Acceptance Spectrometer (CLAS). Preliminary data on the transition multipoles at small and at large photon virtualities are presented, showing the importance of the nucleon pion cloud. In the second nucleon resonance region, new results on the transition amplitudes for the Roper , the , and the states are presented. The transverse Roper photocoupling amplitude shows a strong dependence that is best described in terms of large meson cloud contributions. The helicity amplitudes for the are extracted from both single pion production as well as eta production, giving consistent results. In contrast to the Roper resonance, a nearly -independent behavior is observed at small values supporting the interpretation of this state as a nearly pure three-quark resonance. The amplitudes show the rapid change of the helicity structure predicted by non-relativistic quark models. Searches for new baryon states in two-pion photoproduction and electroproduction show consistently a need for a new state near 1.72 GeV with . Finally, the search for the and other pentaquark baryon states with CLAS is presented. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Progress in Particle & Nuclear Physics is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.ppnp.2005.01.015
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        Text: English
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    Subjects:
      – SubjectFull: Particles (Nuclear physics)
        Type: general
      – SubjectFull: Nuclear magnetic resonance
        Type: general
      – SubjectFull: Spectrometers
        Type: general
      – SubjectFull: Baryons
        Type: general
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      – TitleFull: Electromagnetic excitations of baryon resonances
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              Text: Jun2005
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