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arXiv 1808.01231hep-phhep-ex
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顶夸克稀有衰变中重夸克偶素的产生

Heavy quarkonium production through the top quark rare decays via the channels involving flavor changing neutral currents

Juan-Juan Niu, Lei Guo, Hong-Hao Ma, Shao-Ming Wang

备注：
17 pages, 8 figures and 6 tables, to be published in European Physical Journal C. arXiv admin note: text overlap with arXiv:1304.1303 by other authors
发表信息：
Eur.Phys.J. C78 (2018) 657
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摘要：

本文讨论了通过味变中性流（FCNC）过程观测重夸克偶素的可能性。在非相对论性QCD（NRQCD）分解理论框架下，系统地计算了顶夸克半排他稀有FCNC衰变产生重粲偶素和$(c\bar{b})$ -夸克偶素.结果表明，总衰变宽度为$Γ_{t\to η_c} =1.20^{+1.04+1.14}_{-0.51-0.45}\times 10^{-16}$ GeV，$Γ_{t\to J/ψ} =1.37^{+1.03+1.30}_{-0.51-0.51}\times 10^{-16}$ GeV，$Γ_{t\to B_c}=2.06^{+0.17+0.91}_{-0.17-0.54}\times 10^{-18}$ GeV和$Γ_{t\to B^*_c}=6.27^{+0.63+2.78}_{-0.62-1.64}\times 10^{-18}$ GeV，其中的不确定性来自夸克质量和重整化标度的变化.尽管衰变宽度很小，但在标准模型下对顶夸克通过FCNC衰变产生粲偶素和$(c\bar{b})$ -夸克偶素的过程进行系统的研究是非常重要的，这将为今后涉及重夸克偶素过程的新物理研究提供有益的指导。

英文摘要：

In the paper, we discuss the possibility of observation of heavy quarkoniums via the processes involving flavor changing neutral currents (FCNC). More explicitly, we systematically calculate the production of heavy charmonium and $(c\bar{b})$-quarkonium through the top quark semi-exclusive rare FCNC decays in the framework of the non-relativistic QCD (NRQCD) factorization theory. Our results show that the total decay widths $Γ_{t\to η_c} =1.20^{+1.04+1.14}_{-0.51-0.45}\times 10^{-16}$ GeV, $Γ_{t\to J/ψ} =1.37^{+1.03+1.30}_{-0.51-0.51}\times 10^{-16}$ GeV, $Γ_{t\to B_c}=2.06^{+0.17+0.91}_{-0.17-0.54}\times 10^{-18}$ GeV, and $Γ_{t\to B^*_c}=6.27^{+0.63+2.78}_{-0.62-1.64}\times 10^{-18}$ GeV, where the uncertainties are from variation of quark masses and renormalization scales. Even though the decay widths are small, it is important to make a systematic study on the production of charmonium and $(c\bar{b})$-quarkonium through the top-quark decays via FCNC in the Standard Model, which will provide useful guidance for future new physics research from the heavy quarkonium involved processes.

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