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arXiv 1302.0601hep-ph
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高亮度$e^+ e^-$对撞机上$Z^0$峰附近二重重子产生的进一步研究

Further Study on the Doubly Heavy Baryon Production around the $Z^0$ Peak at A High Luminosity $e^+ e^-$ Collider

Jun Jiang, Xing-Gang Wu, Shao-Ming Wang, Jia-Wei Zhang, Zhen-Yun Fang

摘要:

二重重子$Ξ_{QQ^{\prime}}$($Q^{(\prime)}$ = $b$或$c$)不同于普通重子。二重重子的产生为有色$(QQ^{\prime})$ -双夸克如何转变为色单重态重子提供了有价值的见解。作为一个连续的工作参考。[2]本文在非相对论QCD框架下,进一步研究了通过$e^+ e^-$湮灭通道($e^{+} + e^{-}\rightarrowγ/Z^0 \rightarrow Ξ_{QQ^{\prime}} +\bar{Q} +\bar{Q^{\prime}}$)产生的双重重子。除了总截面外,我们给出了所有这些通道的重子横动量和快度分布。采用典型的重子横动量和快度截量,可以清楚地显示这些分布的性质。与Belle和BABAR实验相比,在$e^+ e^-$对撞机上运行的$Z^0$ -玻色子质量高达${\cal L} = 10^{34-36}{\rm cm}^{-2} {\rm s}^{-1}$的高光度对撞机上,发现即使在进行了重子横动量和快度削减后,由于$Z^0$ -玻色子共振效应,仍能产生相当大的$Ξ_{cc}$,$Ξ_{bc}$和$Ξ_{bb}$事例.

英文摘要:

The doubly heavy baryon $Ξ_{QQ^{\prime}}$ ($Q^{(\prime)}$ = $b$ or $c$) is different from the ordinary baryons. The production of the doubly heavy baryon can provide valuable insight on how the colored $(QQ^{\prime})$-diquark can be transformed into the color-singlet baryon. As a sequential work of Ref.[2], we make a further study on the doubly heavy baryon production through the $e^+ e^-$ annihilation channel, $e^{+} + e^{-}\rightarrowγ/Z^0 \rightarrow Ξ_{QQ^{\prime}} +\bar{Q} +\bar{Q^{\prime}}$, within the nonrelativistic QCD framework. In addition to the total cross sections, we present the baryon transverse momentum and the rapidity distributions for all these channels. Typical baryon transverse momentum and rapidity cuts are adopted to show the properties of these distributions clearly. At a $e^+ e^-$ collider that runs around the $Z^0$-boson mass with a high luminosity up to ${\cal L} = 10^{34-36}{\rm cm}^{-2} {\rm s}^{-1}$, in comparison to the Belle and BABAR experiments, it is found that sizable $Ξ_{cc}$, $Ξ_{bc}$ and $Ξ_{bb}$ events can be produced even after performing baryon's transverse momentum and rapidity cuts due to $Z^0$-boson resonance effect.

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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