arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2403.03705hep-phhep-ex
收藏

更高的粲偶素如何塑造 $e^+e^-\ o ηJ/ψ$ 截面的令人困惑的数据

How higher charmonia shape the puzzling data of the $e^+e^-\to ηJ/ψ$ cross section

Tian-Cai Peng, Zi-Yue Bai, Jun-Zhang Wang, Xiang Liu

备注：
11 pages, 4 figures and 4 tables. Accepted by Phys. Rev. D. More discussions were added
发表信息：
Phys. Rev. D 109, 094048 (2024)
阅读 PDF
arXiv 页面 ↗HTML 原文 ↗

AI总结：

针对BESIII测量的 $e^+e^-\ o ηJ/ψ$ 截面数据异常，本研究使用4.0-4.5 GeV范围内的五个粲偶素态，结合强子圈机制计算的衰变率进行组合拟合，成功重现了实验数据，表明4.2 GeV附近结构源于 $ψ(4160)$ 和 $ψ(4220)$ 的共同贡献。

摘要：

最近，BESIII合作组对 $e^+e^-\ o ηJ/ψ$ 截面进行了精确测量。令人困惑的是，所报告的 $Y(4230)$ 的共振参数与之前在开粲和隐粲衰变通道中测量的结果存在显著差异，并且接近 4.2 GeV 的数据线形不对称性也表明，很难用单一共振态来表征 4.2 GeV 附近结构的细节。这极大地激发了我们的好奇心：粲偶素态在测量的能量范围内是如何分布的，以及它们如何塑造 $e^+e^-\ o ηJ/ψ$ 截面这些令人困惑的数据。在本工作中，我们使用了在 $4.0\ m{-}4.5$ $\ ext{GeV}$ 范围内理论上构建的五个粲偶素，即 $ψ(4040)$、$ψ(4160)$、$ψ(4220)$、$ψ(4380)$ 和 $ψ(4415)$，对数据进行组合拟合，其中将它们通过强子圈机制计算得到的向 $ηJ/ψ$ 衰变的衰变率作为输入。拟合结果能够很好地重现测量的截面数据，特别是 4.2 GeV 附近的精细线形，这表明 4.2 GeV 附近的结构可能来自 $ψ(4160)$ 和 $ψ(4220)$ 的共同贡献。

英文摘要：

Recently, the BESIII collaboration performed a precise measurement of the $e^+e^-\to ηJ/ψ$ cross section. It is puzzling that the resonance parameters of the reported $Y(4230)$ show a substantial divergence from the previously measured results in both the open-charmed and hidden-charmed decay channels, and the line shape asymmetry of the data approaching 4.2 GeV also suggests that it might be difficult to characterize the details of the structure around 4.2 GeV by a single resonance. This has motivated our great curiosity about how the charmonium states are distributed in the measured energy range and how they shape the puzzling data of the $e^+e^-\to ηJ/ψ$ cross section. In this work, we use five theoretically constructed charmonia in the range of $4.0\rm{-}4.5$ $\text{GeV}$, i.e., $ψ(4040)$, $ψ(4160)$, $ψ(4220)$, $ψ(4380)$, and $ψ(4415)$, to apply a combined fit to the data, in which their calculated decay ratios into $ηJ/ψ$ via hadronic loop mechanism are taken as input. The fit results can reproduce the measured cross section data well, especially for the subtle line shape around 4.2 GeV, showing that the structure around 4.2 GeV is possible from the contribution of both $ψ(4160)$ and $ψ(4220)$.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

↑