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arXiv 1807.02145hep-phhep-exhep-lat
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$Ω$(2012)通过其强衰变的性质

Nature of the $Ω$(2012) through its strong decays

T. M. Aliev, K. Azizi, Y. Sarac, H. Sundu

摘要:

我们利用光锥QCD求和规则研究了最近发现的$Ω(2012)$态的强衰变并计算了它的宽度,从而扩展了我们以前对它的质量的分析。考虑$Ω(2012)$态量子数的两种可能性,即$1P$与$J^P=\frac{3}{2}^-$的轨道激发和$2S$与$J^P=\frac{3}{2}^+$的径向激发,得到了定义$Ω(1P/2S)\rightarrowΞK$衰变的强耦合常数.耦合常数的结果然后用于计算对应于每种可能性的衰减宽度。将本文得到的总宽度与实验值进行比较,并考虑到我们以前对$Ω(2012)$态的质量预测结果,我们得出这个态是量子数为$J^P=\frac{3}{2}^-$的基态$Ω$重子的$1P$轨道激发.

英文摘要:

We extend our previous analysis on the mass of the recently discovered $Ω(2012)$ state by investigation of its strong decays and calculation of its width employing the method of light cone QCD sum rule. Considering two possibilities for the quantum numbers of $Ω(2012)$ state, namely $1P$ orbital excitation with $J^P=\frac{3}{2}^-$ and $2S$ radial excitation with $J^P=\frac{3}{2}^+$, we obtain the strong coupling constants defining the $Ω(1P/2S)\rightarrowΞK$ decays. The results of the coupling constants are then used to calculate the decay width corresponding to each possibility. Comparison of the obtained results on the total widths in this work with the experimental value and taking into account the results of our previous mass prediction on the $Ω(2012)$ state, we conclude that this state is $1P$ orbital excitation of the ground state $Ω$ baryon, whose quantum numbers are $J^P=\frac{3}{2}^-$.

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