تقرير
Poles and Poltergeists in $e^+ e^- \to D \bar D$ Data
| العنوان: | Poles and Poltergeists in $e^+ e^- \to D \bar D$ Data |
|---|---|
| المؤلفون: | Hüsken, Nils, Lebed, Richard F., Mitchell, Ryan E., Swanson, Eric S., Wang, Ya-Qian, Yuan, Chang-Zheng |
| سنة النشر: | 2024 |
| المجموعة: | High Energy Physics - Phenomenology |
| مصطلحات موضوعية: | High Energy Physics - Phenomenology |
| الوصف: | 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 $\psi(4040)$ wave function, although a node improves fit quality. The measured $e^+ e^-$ coupling of $\psi(4040)$ is found to be substantially smaller than previously estimated. In addition, we report new corrections to the measured cross section $\sigma(e^+ e^- \to D\bar D)$ at energies near $\psi(3770)$. Comment: Discussion of previous work updated. 9 pages, 8 figures |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2404.03896 |
| رقم الأكسشن: | edsarx.2404.03896 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |