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arXiv 2109.01682hep-ph
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喷射时期

Jet Timing

Wen Han Chiu, Zhen Liu, Matthew Low, Lian-Tao Wang

摘要:

对粒子(如轻子、光子或π介子)到达探测器的时间的测量提供了有价值的信息。然而,对强子末态的类似测量更具挑战性,因为人们必须从粒子集合中提取相关信息。在本文中,我们探讨了各种可能性,通过可测量的到达时间的射流成分定义的时间。我们发现,基于横向动量加权和的时间的成分的喷射时间的定义具有最好的性能。对于瞬发射流,性能取决于射流轨迹。对于延迟射流,性能取决于射流的轨迹,母粒子的轨迹,和位移顶点的位置。与次优喷流时间定义相比,横向动量加权和的喷流时间分辨率大约好10倍。我们给出了一个详细的讨论的相关影响和表征的性能的完整的几何依赖。这些结果突出了使用一个适当的定义喷射时间与其相应的检测器相关的校准和令人兴奋的可能性,加深我们的理解射流在时域中的至关重要的。

英文摘要:

The measurement of the arrival time of a particle, such as a lepton, a photon, or a pion, reaching the detector provides valuable information. A similar measurement for a hadronic final state, however, is much more challenging as one has to extract the relevant information from a collection of particles. In this paper, we explore various possibilities in defining the time of a jet through the measurable arrival times of the jet constituents. We find that a definition of jet time based on a transverse momentum weighted sum of the times of the constituents has the best performance. For prompt jets, the performance depends on the jet trajectory. For delayed jets, the performance depends on the trajectory of the jet, the trajectory of the mother particle, and the location of the displaced vertex. Compared to the next-best-performing jet time definition, the transverse momentum weighted sum has roughly a factor of ten times better jet time resolution. We give a detailed discussion of the relevant effects and characterize the full geometrical dependence of the performance. These results highlight the critical importance of using a proper definition of jet time with its corresponding detector-dependent calibration and the exciting possibility of deepening our understanding of jets in the time domain.

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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