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arXiv 2405.01416hep-ph
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短基线实验中μ子中微子质量的新上限

New upper bound of muon neutrino mass in a short-baseline experiment

A. M. Attia, I. G. Márián, B. Ujvári

AI总结:

本文利用Geant4模拟改进短基线实验设置,通过测量μ子中微子飞行时间和能量沉积,将μ子中微子质量上限从文献最佳值降低3倍至约150 keV。

摘要:

在论文Int.J.Mod.Phys.E 23 (2014) 1450004中,提出了利用短基线实验测量μ子中微子质量(以及洛伦兹破坏效应参数)的潜力,其中给出了一个粗略估计的420 eV上限,但存在较大的未知不确定性。在本工作中,我们通过关注一个利用当今技术可行且改进的实验设置来改进这项研究,借助Geant4模拟工具包消除了大部分大的不确定性。高能质子与钨靶碰撞,产生多种粒子,最重要的是衰变为μ子中微子的π介子。探测器利用光作为参考信号,记录μ子中微子和反μ子中微子的飞行时间。此外,它还捕获中微子沉积的能量。通过应用色散关系,我们确定了μ子和/或反μ子中微子的质量。我们改进后的结果揭示了一个不那么乐观但更准确和现实的μ子中微子质量估计上限,提供了约150 keV的新极限。值得注意的是,这一发现比文献中先前由飞行中π介子衰变确立的最佳上限低了3倍。

英文摘要:

In the paper Int.J.Mod.Phys.E 23 (2014) 1450004, the potential of short-baseline experiments was proposed to measure the mass (and parameters of Lorentz-violating effects) of the muon neutrino, where a roughly estimated upper bound of 420 eV was given as a possibility with large unknown uncertainties. In the present work, we improve upon this study by focusing on a feasible and improved experimental setup with today's technology, eliminating most large uncertainties, with the use of the Geant4 simulation toolkit. High-energy protons collide with a tungsten target, producing a variety of particles, most importantly pions that decay into muon neutrinos. The detector records the time of flight for both muon and anti-muon neutrinos, utilizing light as a reference signal. Additionally, it captures the energy deposited by neutrinos. By applying the dispersion relation, we determine the muon and/or anti-muon neutrino mass. Our improved results reveal a less optimistic but more accurate and realistic estimated upper bound of the muon neutrino mass, providing a new limit of about 150 keV. Notably, this finding is a factor of three lower than the best upper bound previously established in the literature originating from pion decay in flight.

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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