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| Main Authors: | , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2404.03896 |
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| _version_ | 1866913313684717568 |
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| author | Hüsken, Nils Lebed, Richard F. Mitchell, Ryan E. Swanson, Eric S. Wang, Ya-Qian Yuan, Chang-Zheng |
| author_facet | Hüsken, Nils Lebed, Richard F. Mitchell, Ryan E. Swanson, Eric S. Wang, Ya-Qian Yuan, Chang-Zheng |
| contents | A recent report of $e^+ e^- \to D\bar D$ events by the BESIII Collaboration suggests the presence of a structure $R$ at 3900~MeV\@. We argue that this structure, called $G(3900)$ in the past, is not in fact due to a new $c\bar c$ resonance, but rather naturally emerges as a threshold enhancement due to the opening of the $D^*\bar D$ channel. We further find that the appearance of this structure does not require suppression because of a radial node in the $ψ(4040)$ wave function, although a node improves fit quality. The measured $e^+ e^-$ coupling of $ψ(4040)$ is found to be substantially smaller than previously estimated. In addition, we report new corrections to the measured cross section $σ(e^+ e^- \to D\bar D)$ at energies near $ψ(3770)$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_03896 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Poles and Poltergeists in $e^+ e^- \to D \bar D$ Data Hüsken, Nils Lebed, Richard F. Mitchell, Ryan E. Swanson, Eric S. Wang, Ya-Qian Yuan, Chang-Zheng High Energy Physics - Phenomenology A recent report of $e^+ e^- \to D\bar D$ events by the BESIII Collaboration suggests the presence of a structure $R$ at 3900~MeV\@. We argue that this structure, called $G(3900)$ in the past, is not in fact due to a new $c\bar c$ resonance, but rather naturally emerges as a threshold enhancement due to the opening of the $D^*\bar D$ channel. We further find that the appearance of this structure does not require suppression because of a radial node in the $ψ(4040)$ wave function, although a node improves fit quality. The measured $e^+ e^-$ coupling of $ψ(4040)$ is found to be substantially smaller than previously estimated. In addition, we report new corrections to the measured cross section $σ(e^+ e^- \to D\bar D)$ at energies near $ψ(3770)$. |
| title | Poles and Poltergeists in $e^+ e^- \to D \bar D$ Data |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2404.03896 |