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arXiv 1708.02593hep-ph
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激发态矢量介子的强衰变和辐射衰变及新的$ϕ(1930)$共振的预言

Strong and radiative decays of excited vector mesons and predictions for a new $ϕ(1930)$ resonance

Milena Piotrowska, Christian Reisinger, Francesco Giacosa

摘要:

本文研究了两种激发矢量介子九元态$\{ρ(1450)$,$K^{\ast}(1410)$,$ω(1420)$,$ϕ(1680)\}$和$\{ρ(1700),$ $K^{\ast}(1680),ω(1650),$ $ϕ(???)\},$的唯象,它们(大致)对应于径向激发$2^{3}S_{1}$和轨道激发$1^{3}D_{1}$矢量介子.我们利用基于味对称性的相对论QFT模型计算了这些介子到赝标和基态矢量介子的强辐射衰变。我们比较衰变宽度和分支比与PDG中列出的各种实验结果。理论与实验的总体一致性加强了上述共振的标准夸克-反夸克分配。还对尚未测量的数量进行了预测。特别是,我们还将预测尚未发现的$s\bar{s}$状态的$1^{3}D_{1}$九,表示为$ϕ(???)$。它的质量可以估计为大约$1930$ MeV,因此我们称这个假定的状态为$ϕ(1930).$。它的主要衰变是进入$KK^{\ast}(892)$(大约$200$ MeV)和$KK$(大约$100$ MeV)。由于这种状态也与$γη,$相结合,因此可以在不久的将来在杰斐逊实验室的基于光生作用的实验GSPX和CLAS 12中进行搜索。

英文摘要:

We study the phenomenology of two nonets of excited vector mesons, $\{ρ(1450)$, $K^{\ast}(1410)$, $ω(1420)$, $ϕ(1680)\}$ and $\{ρ(1700),$ $K^{\ast}(1680),ω(1650),$ $ϕ(???)\},$ which (roughly) correspond to radially excited $2^{3}S_{1}$ and to orbitally excited $1^{3}D_{1}$ vector mesons. We evaluate the strong and radiative decays of these mesons into pseudoscalar and ground-state vector mesons by using an effective relativistic QFT model based on flavour symmetry. We compare decay widths and branching ratios with various experimental results listed in the PDG. An overall agreement of theory with experiment reinforces the standard quark-antiquark assignment of the resonances mentioned above. Predictions for not yet measured quantities are also made. In particular, we shall also make predictions for the not-yet discovered $s\bar{s}$ state of the $1^{3}D_{1}$ nonet, denoted as $ϕ(???)$. Its mass can be estimated to be about $1930$ MeV, hence we shall call this putative state $ϕ(1930).$ Its main decays are into $KK^{\ast}(892)$ (about $200$ MeV) and $KK$ (about $100$ MeV). Since this state couples also to $γη,$ it can be searched in the near future in the photoproduction-based experiments GlueX and CLAS12 at Jefferson Lab.

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。

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