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| Main Authors: | , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2510.22425 |
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| _version_ | 1866908612277829632 |
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| author | Burkert, Volker Klempt, Eberhard |
| author_facet | Burkert, Volker Klempt, Eberhard |
| contents | The properties of the Roper resonance N(1440) are reviewed. Quark models have long struggled to reproduce its mass relative to its negative-parity partner N(1535). This discrepancy motivated interpretations of the Roper as a dynamically generated meson-baryon state. Including its isospin partners Delta(1600) and Delta(1700) further accentuates the tension between quark-model predictions and experiment. Recent developments based on AdS/QCD and functional methods achieve much improved agreement, identifying the Roper as an ordinary three-quark excitation. Electroproduction experiments at Jefferson Lab have now resolved this long-standing question, revealing the Roper as a qqq core dressed by a substantial meson cloud. The Roper resonance belongs to a family of four N* states with JP = 1/2+; the highest-mass member, N(2100), likely represents a Roper-like excitation in the fourth shell. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_22425 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The Roper resonance and kin Burkert, Volker Klempt, Eberhard Nuclear Experiment The properties of the Roper resonance N(1440) are reviewed. Quark models have long struggled to reproduce its mass relative to its negative-parity partner N(1535). This discrepancy motivated interpretations of the Roper as a dynamically generated meson-baryon state. Including its isospin partners Delta(1600) and Delta(1700) further accentuates the tension between quark-model predictions and experiment. Recent developments based on AdS/QCD and functional methods achieve much improved agreement, identifying the Roper as an ordinary three-quark excitation. Electroproduction experiments at Jefferson Lab have now resolved this long-standing question, revealing the Roper as a qqq core dressed by a substantial meson cloud. The Roper resonance belongs to a family of four N* states with JP = 1/2+; the highest-mass member, N(2100), likely represents a Roper-like excitation in the fourth shell. |
| title | The Roper resonance and kin |
| topic | Nuclear Experiment |
| url | https://arxiv.org/abs/2510.22425 |