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北美退伍军人节(Veterans Day),12 日无更新
arXiv 2005.07719hep-ph
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大气中微子振荡中CP破坏的解析描述

Analytical description of CP violation in oscillations of atmospheric neutrinos traversing the Earth

Ara Ioannisian, Stefan Pokorski, Janusz Rosiek, Michal Ryczkowski

摘要:

亚GeV大气中微子和反中微子的味振荡,穿越地球内部不同的距离,是一个有前途的信息来源的轻子CP相位$δ$。在这个能量范围内,振荡非常快,远远超出了现代中微子探测器的分辨率。然而,对实验上典型的能量和方位角仓进行必要的平均并不能消除CP破坏效应。在本文中,我们得到非常准确的解析紧凑的平均振荡概率的表达式。假设球对称的地球,平均振荡概率描述的两个解析计算的有效参数。基于这些表达式,我们估计最大幅度的CP违规的影响,在这样的测量,并提出最适合于确定的PMNS混合矩阵中的CP相位的值的最佳观测。

英文摘要:

Flavour oscillations of sub-GeV atmospheric neutrinos and antineutrinos, traversing different distances inside the Earth, are a promising source of information on the leptonic CP phase $δ$. In that energy range, the oscillations are very fast, far beyond the resolution of modern neutrino detectors. However, the necessary averaging over the experimentally typical energy and azimuthal angle bins does not wash out the CP violation effects. In this paper we derive very accurate analytic compact expressions for the averaged oscillations probabilities. Assuming spherically symmetric Earth, the averaged oscillation probabilities are described in terms of two analytically calculable effective parameters. Based on those expressions, we estimate maximal magnitude of CP-violation effects in such measurements and propose optimal observables best suited to determine the value of the CP phase in the PMNS mixing matrix.

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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