排序方式: 共有35条查询结果,搜索用时 31 毫秒
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For more than 25 yearsJΨ production has helped to sharpen our understanding of QCD. In proton induced reaction some observations are rather well understood
while others are still unclear. The current status of the theory ofJΨ production will be sketched, paying special attention to the issues of formation time andJΨ re-interaction in a nuclear medium. 相似文献
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陈云华 《中国物理C(英文版)》2020,(2):42-50
We study the contributions of intermediate bottomonium-like Zb states and the bottom meson loops in the heavy quark spin flip transitionsγ(4 S)→hb(1 P,2 P)π+π-.Depending on the constructive or destructive interferences between the Zb-exchange and the bottom meson loops mechanisms,we predict two possible branching ratios for each process:BRγ(4 S)→hb(1 P)π+π-≈(1.20.40.8×10^-6)or(0.5-0.20.5×10^-6),and BRγ(4 S)→(2 P)π+π-≈(7.1-1.1+1.7×10^-10)or(2.4-0.10.2×10^-10)).The contribution of the bottom meson loops is found to be considerably larger than that of the Zbexchange in the T(4 S)→hb(1 P)ππtransitions,while its decay rates are not comparable to those of heavy quark spin conservedγ(4 S)→γ(1 S,2 S)ππprocesses.We also predict the contribution of the charm meson loops in the branch fractions ofΨ(3 S,4 S)→hc(1 P)ππ. 相似文献
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A brief review of the experimental situation concerning the electrically charged charmoniumlike meson candidates, Z-, is presented. 相似文献
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自旋相关的相对论修正对有限温度下重夸克偶素的结合和分解的影响进行了讨论,结果表明精细和超精细相互作用特影响对重夸克偶素性质的预言,特别是对ηc和J/ψ起着明显的作用. 相似文献
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K.Hara 《中国物理C(英文版)》2010,34(9)
As early physics programs with the ATLAS detector,we present J/ψ and Υ production cross section and spin alignment measurements,and the strategy for the jet energy calibration. 相似文献
6.
Entropic destruction of heavy quarkonium in a rotating hot and dense medium from holography 下载免费PDF全文
Previous studies have indicated that the peak of the quarkonium entropy at the deconfinement transition can be related to the entropic force, which would induce the dissociation of heavy quarkonium. In this study, we investigated the entropic force in a rotating hot and dense medium using AdS/CFT correspondence. It was found that the inclusion of angular velocity increases the entropic force, thus enhancing quarkonium dissociation, while chemical potential has the same effect. The results imply that the quarkonium dissociates easier in rotating medium compared with the static case. 相似文献
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By studying the \begin{document}$\eta_c$\end{document} ![]()
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exclusive decay to double glueballs, we introduce a model to phenomenologically mimic the gluon-pair-vacuum interaction vertices, namely the \begin{document}$0^{++}$\end{document} ![]()
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model. Based on this model, we study glueball production in pseudoscalar quarkonium decays, explicitly \begin{document}$\eta_c \to f_0(1500)\eta(1405)$\end{document} ![]()
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, \begin{document}$\eta_b\to f_0(1500)\eta(1405)$\end{document} ![]()
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, and \begin{document}$\eta_b\to f_0(1710)\eta(1405)$\end{document} ![]()
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processes. Among them \begin{document}$f_0(1500)$\end{document} ![]()
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and \begin{document}$f_0(1710)$\end{document} ![]()
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are well-known scalars possessing large glue components, while \begin{document}$\eta(1405)$\end{document} ![]()
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is a potential candidate for a pseudoscalar glueball. The preliminary calculation results indicate that these processes are marginally accessible in the presently running experiments BES III, BELLE II, and LHCb. 相似文献
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Questions about detecting the CP-violating decay process of J/ψ→ K0K0→KsKs are discussed. Possible background and material regeneration effects are analyzed. The discussion can be directly extended to other vector quarkoniuln decays, like Υ, ψ (2S) and φ→ KsKs. 相似文献