观察$Ω（2012）^ - \ toξ（1530）\ bar {k} $以及$ω（2012）^ - $ to $ξ（1530）\ bar {k} $和$ξ\ bar {k} $的有效耦合的测量

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观察$Ω（2012）^ - \ toξ（1530）\ bar {k} $以及$ω（2012）^ - $ to $ξ（1530）\ bar {k} $和$ξ\ bar {k} $的有效耦合的测量

Observation of $Ω(2012)^- \to Ξ(1530)\bar{K}$ and measurement of the effective couplings of $Ω(2012)^-$ to $Ξ(1530)\bar{K}$ and $Ξ\bar{K}$

论文作者

Belle Collaboration, Jia, S., Shen, C. P., Yuan, C. Z., Ahn, J. K., Aihara, H., Asner, D. M., Atmacan, H., Ayad, R., Bahinipati, S., Banerjee, Sw., Bennett, J., Bessner, M., Biswas, D., Bračko, M., Branchini, P., Budano, A., Campajola, M., Chang, M. -C., Cheon, B. G., Cho, H. E., Choi, S. -K., Choi, Y., Choudhury, S., De Pietro, G., Dhamija, R., Di Capua, F., Dingfelder, J., Ecker, P., Epifanov, D., Ferber, T., Ferlewicz, D., Fulsom, B. G., Gaur, V., Garmash, A., Giri, A., Goldenzweig, P., Graziani, E., Greenwald, D., Gudkova, K., Hadjivasiliou, C., Herrmann, D., Hou, W. -S., Ipsita, N., Ishikawa, A., Itoh, R., Iwasaki, M., Jacobs, W. W., Jin, Y., Joo, K. K., Kiesling, C., Kim, D. Y., Kim, K. -H., Kim, Y. -K., Kinoshita, K., Kodyš, P., Korobov, A., Kovalenko, E., Križan, P., Krokovny, P., Kumar, R., Kumara, K., Kumita, T., Kwon, Y. -J., Lam, T., Li, L. K., Li, S. X., Li, Y. B., Liventsev, D., Masuda, M., Matvienko, D., Maurya, S. K., Meier, F., Merola, M., Mizuk, R., Mussa, R., Nakao, M., Natochii, A., Niiyama, M., Nishida, S., Pakhlov, P., Pakhlova, G., Pardi, S., Park, J., Pedlar, T. K., Pestotnik, R., Piilonen, L. E., Podobnik, T., Prencipe, E., Prim, M. T., Russo, G., Sandilya, S., Schnell, G., Schwanda, C., Seino, Y., Senyo, K., Shan, W., Shiu, J. -G., Sokolov, A., Solovieva, E., Starič, M., Sumihama, M., Takizawa, M., Tamponi, U., Tanida, K., Tenchini, F., Unno, Y., Uno, S., Urquijo, P., Usov, Y., Wang, M. -Z., Won, E., Yabsley, B. D., Yan, W., Yelton, J., Yin, J. H., Yuan, L., Zhang, Z. P., Zhilich, V., Zhukova, V.

论文摘要

使用$υ（1s）$，$υ（2s）$和$υ（3S）$数据由Belle检测器收集的数据，我们发现了一个新的三体衰变，$ω（2012）^ - \ to了ξ（1530）\ bar k \ to了ξπ\ bar k $，其重要性为5.2〜 $σ$。 $ω（2012）^ - $是$（2012.5 \ pm0.7 \ pm0.5）$ mev及其有效耦合到$ξ（1530）\ bar {k} $和$ξ\ bar {k {k} $是$（39^{+31} _ {+31} _ { - 39} _ { - 39} $ 2} $（1.7 \ pm0.3 \ pm0.3）\ times10^{ - 2} $，其中第一个不确定性是统计的，第二个是系统的。假设Isospin Symmetry假定，三体衰减的分支分数与两体衰减与$ξ\ bar {k} $的比率为$ 0.99 \ pm0.26 \ pm0.06 $。

Using $Υ(1S)$, $Υ(2S)$, and $Υ(3S)$ data collected by the Belle detector, we discover a new three-body decay, $Ω(2012)^-\toΞ(1530)\bar K\toΞπ\bar K$, with a significance of 5.2~$σ$. The mass of the $Ω(2012)^-$ is $(2012.5\pm0.7\pm0.5)$ MeV and its effective couplings to $Ξ(1530)\bar{K}$ and $Ξ\bar{K}$ are $(39^{+31}_{-39}\pm9)\times10^{-2}$ and $(1.7\pm0.3\pm0.3)\times10^{-2}$, where the first uncertainties are statistical and the second are systematic. The ratio of the branching fraction for the three-body decay to that for the two-body decay to $Ξ\bar{K}$ is $0.99\pm0.26\pm0.06$, assuming isospin symmetry.

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