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arXiv 2004.05204hep-ph
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用$ψ(3770) \to γD^0 \bar D^0$衰变寻找$D \bar D$束缚态

Searching for a $D \bar D$ bound state with the $ψ(3770) \to γD^0 \bar D^0$ decay

Lianrong Dai, Genaro Toledo, Eulogio Oset

摘要:

我们计算了$ψ(3770) \to γD \bar D$衰变的质量分布,研究了$D^+ D^- $和$D^0 \bar D^0 $衰变。电磁相互作用使得树水平振幅对于中性通道为零,这使得$ψ(3770) \to γD^0 \bar D^0$继续通过涉及$D^+ D^- \to D^0 \bar D^0$散射振幅的环路。我们使用的理论模型,预测$D \bar D$束缚态,并找到一个$D^0 \bar D^0 $的质量分布在衰变中的振幅的结果显着不同的相空间。实验结果表明,在现有的BESIII装置上,实验是可行的。这个实验的性能可以提供一个答案的问题,这个多搜索状态,这是类似的$f_0(980)$共振。

英文摘要:

We perform a calculation of the mass distribution in the $ψ(3770) \to γD \bar D$ decay, studying both the $D^+ D^- $ and $D^0 \bar D^0 $ decays. The electromagnetic interaction is such that the tree level amplitude is null for the neutral channel, which leaves the $ψ(3770) \to γD^0 \bar D^0$ proceeding through a loop involving the $D^+ D^- \to D^0 \bar D^0$ scattering amplitude. We use the results for this amplitude of a theoretical model that predicts a $D \bar D$ bound state and find a $D^0 \bar D^0 $ mass distribution in the decay drastically different than phase space. The rates obtained are relatively large and the experiment is easily feasible in the present BESIII facility. The performance of this experiment could provide an answer to the issue of this much searched for state, which is the analogue of the $f_0(980)$ resonance.

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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