S波自旋单态底夸克偶素衰变到粲夸克对

doi:10.13700/j.bh.1001-5965.2018.0267

北京航空航天大学学报 ›› 2019, Vol. 45 ›› Issue (1): 212-217.doi: 10.13700/j.bh.1001-5965.2018.0267

S波自旋单态底夸克偶素衰变到粲夸克对

孙佳佳, 张玉洁, 熊畅

北京航空航天大学物理科学与核能工程学院, 北京 100083

收稿日期:2018-05-10 修回日期:2018-05-18 出版日期:2019-01-20 发布日期:2019-01-28
通讯作者: 熊畅 E-mail:09434@buaa.edu.cn
作者简介:孙佳佳,女,硕士研究生。主要研究方向:物理学;熊畅,女,博士,实验员。主要研究方向:物理学。
基金资助:
中央高校基本科研业务费专项资金

S-wave spin singlet bottomonium decay to charm quark pair

SUN Jiajia, ZHANG Yujie, XIONG Chang

School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100083, China

Received:2018-05-10 Revised:2018-05-18 Online:2019-01-20 Published:2019-01-28
Supported by:
the Fundamental Research Funds for the Central Universities

摘要/Abstract

摘要： 对S波自旋单态底夸克偶素衰变到粲夸克对进行了研究，同时还研究了S波自旋单态和自旋三重态底夸克偶素衰变到D介子对。利用BaBar实验组测量得到的自旋三重态底夸克偶素衰变到D介子分支比的数据，发现自旋三重态底夸克偶素的色八重态矩阵元远小于理论预言，理论预言要比实验上限大20倍以上；得到S波自旋单态底夸克偶素衰变到粲夸克对的分支比的理论预言，可以进行实验测量从而研究色八重态矩阵元；得到S波自旋单态底夸克偶素衰变到D介子对的分支比的理论预言，与其他理论预言差异较大。这些预言可以通过BelleⅡ的实验进行验证，从而得到更多强子化的信息。

关键词: 底夸克偶素, 粲夸克, D介子, 色八重态机制, 碎裂函数

Abstract: The decay of S-wave spin singlet bottomonium state to charm quark pair is studied, and the decay of S-wave spin singlet state and triplet bottomonium state to D meson pair is studied. By using the branching ratio of the decay of S-wave spin triplet bottomonium state to D meson measured by the BaBar Collaboration, it is found that the color octet matrix element of the S-wave spin triplet bottomonium state is much smaller than the theoretical prediction, and the theoretical prediction is a factor of 20 times larger than the experimental upper limit. The theoretical predictions of the branching ratio of S-wave spin singlet bottomonium state to charm quark pair can be used to probe the color octet mechanism. The theoretical predictions of the branching ratio of S-wave spin singlet bottomonium state to D meson pair are different from those of other literature. These predictions can be validated by Belle Ⅱ Collaboration to obtain more information about hadronization.

Key words: bottomonium, charm quark, D meson, color octet mechanism, fragmentation function

中图分类号:

孙佳佳, 张玉洁, 熊畅. S波自旋单态底夸克偶素衰变到粲夸克对[J]. 北京航空航天大学学报, 2019, 45(1): 212-217.

SUN Jiajia, ZHANG Yujie, XIONG Chang. S-wave spin singlet bottomonium decay to charm quark pair[J]. JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2019, 45(1): 212-217.

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S波自旋单态底夸克偶素衰变到粲夸克对

S-wave spin singlet bottomonium decay to charm quark pair

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