arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2409.20439hep-ph
收藏

非各向同性洛伦兹不变性破坏存在下的八分圆歧义

Octant Ambiguity in the Presence of Non-isotropic Lorentz Invariance Violation

Saurabh Shukla, Shashank Mishra, Lakhwinder Singh, Venktesh Singh

AI总结:

本文首次研究非各向同性洛伦兹不变性破坏对中微子混合角 θ23 八分圆歧义测量的影响,发现 DUNE 实验在 c^{xy}_{eτ} 参数存在时分辨能力显著下降,且 LIV 加剧了 δcp 与 θ23 之间的简并。

摘要:

中微子数据的全局分析表明,混合角 $θ_{23}$ 很可能并非最大值,并出现两个紧密匹配的解:一个代表较小的角度($θ_{23}$ < $π/4$),另一个代表较大的角度($θ_{23}$ > $π/4$)。这种歧义被称为 $θ_{23}$ 的八分圆歧义,是中微子研究中的重大挑战,也是未来长基线实验的首要目标之一。在本研究中,我们首次探讨了非各向同性洛伦兹不变性破坏(Lorentz Invariance Violation, LIV)如何影响混合角 $θ_{23}$ 的测量,特别关注深部地下中微子实验(Deep Underground Neutrino Experiment, DUNE)中的恒星时效应。我们的研究结果表明,在 $c^{xy}_{e τ}$ 参数存在的情况下,DUNE 分辨八分圆歧义的能力受到显著损害。此外,我们证明 LIV 加剧了狄拉克 CP 相位 $δ_{cp}$ 与 $θ_{23}$ 之间的简并性。

英文摘要:

Global analyses of neutrino data suggest that the mixing angle $θ_{23}$ is likely to be nonmaximal with two closely matched solutions emerging: one representing a smaller angle ($θ_{23}$ < $π/4$) and the other a larger angle ($θ_{23}$ > $π/4$). This ambiguity, known as the octant ambiguity of $θ_{23}$, presents a significant challenge in neutrino research and is a primary objective of future long-baseline experiments. In this study, for the first time, we explore how non-isotropic Lorentz violation affects measurements of mixing angle $θ_{23}$, with a particular emphasis on sidereal effects in the Deep Underground Neutrino Experiment. Our findings reveal that ability of DUNE to resolve the octant ambiguity is significantly compromised in the presence of the $c^{xy}_{e τ}$ parameter. Furthermore, we demonstrate that LIV exacerbates the degeneracy between the Dirac CP-phase $δ_{cp}$ and $θ_{23}$.

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。

↑