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arXiv 0907.0146hep-ex
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CDF的多μ介子事件

Multi-muon events at CDF

F. Ptochos

摘要:

我们报告的多μ子事件的研究,在费米实验室Tevatron对撞机和CDF II探测器记录。在一个专用的dimuon触发器和相应的2100 PB的积分亮度$^{-1}$,我们隔离的事件中,至少有一个识别的μ子具有大的碰撞参量,并产生半径为1.5厘米的束管外的一个显着的样本。我们无法通过标准模型过程结合我们目前对CDF II探测器、触发器和事件重建的理解来完全解释事件的数量和属性。还介绍了这些事件的几个拓扑和运动学性质。相比之下,其中两个μ子候选者在束管内产生的事件的产生截面和运动学通过包括重味产生的已知QCD过程成功地建模。这些异常多μ子事件的存在为与$b\bar{b}$产生和衰变相关的长期不一致性提供了一个合理的解决方案。

英文摘要:

We report a study of multi-muon events produced at the Fermilab Tevatron collider and recorded by the CDF II detector. In a data set acquired with a dedicated dimuon trigger and corresponding to an integrated luminosity of 2100 pb$^{-1}$, we isolate a significant sample of events in which at least one of the identified muons has large impact parameter and is produced outside the beam pipe of radius 1.5 cm. We are unable to fully account for the number and properties of the events through standard model processes in conjunction with our current understanding of the CDF II detector, trigger and event reconstruction. Several topological and kinematic properties of these events are also presented. In contrast, the production cross section and kinematics of events in which both muon candidates are produced inside the beam pipe are successfully modeled by known QCD processes which include heavy flavor production. The presence of these anomalous multi-muon events offers a plausible resolution to long-standing inconsistencies related to $b\bar{b}$ production and decay.

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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