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On the possibility to determine neutrino mass hierarchy via supernova neutrinos with short-time characteristics 下载免费PDF全文
In this paper, we investigate whether it is possible to determine the neutrino mass hierarchy via a high-statistics and real-time observation of supernova neutrinos with short-time characteristics. The essential idea is to utilize distinct times-of-flight for different neutrino mass eigenstates from a core-collapse supernova to the Earth, which may significantly change the time distribution of neutrino events in the future huge water-Cherenkov and liquid-scintillator detectors. For illustration, we consider two different scenarios. The first case is the neutronization burst of emitted in the first tens of milliseconds of a core-collapse supernova, while the second case is the black hole formation during the accretion phase for which neutrino signals are expected to be abruptly terminated. In the latter scenario, it turns out only when the supernova is at a distance of a few Mpc and the fiducial mass of the detector is at the level of gigaton, might we be able to discriminate between normal and inverted neutrino mass hierarchies. In the former scenario, the probability for such a discrimination is even less due to a poor statistics. 相似文献
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Neutrino masses,leptonic flavor mixing,and muon(g−2)in the seesaw model with the U(1)Lμ-Lrgauge symmetry 下载免费PDF全文
周顺 《中国物理C(英文版)》2022,(1)
The latest measurements of the anomalous muon magnetic moment aμ≡(gμ-2)/2show a 4:2σdiscrepancy between the theoretical prediction of the Standard Model and the experimental observations.To account for such a discrepancy,we consider a possible extension of the type-(I+II)seesaw model for neutrino mass generation with a gauged Lμ-Lrsymmetry.By explicitly constructing an economical model with only one extra scalar singlet,we demonstrate that the gauge symmetry U(1)Lμ-Lrand its spontaneous breaking are crucial not only for explaining the muon result but also for generating the neutrino masses and leptonic flavor mixing.Various phenomenological implications and experimental constraints on the model parameters are also discussed. 相似文献
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<正>2015年,加拿大女王大学的阿瑟·麦克唐纳教授(Arthur B.McDonald)与日本东京大学的梶田隆章教授(Takaaki Kajita)共同分享年度诺贝尔物理学奖,因为他们分别领导加拿大萨德伯里中微子观测站实验(SNO)和日本超级神冈实验(Super-Kamiokande)发现太阳和大气中微子振荡现象,证明中微子有质量。这也是存在超出粒子物理标准模型的新物理的确凿实验证据。 相似文献