arXiv 2409.086202024-09hep-ph

利用束流配置在DUNE探测大额外维

Probing Large Extra Dimension at DUNE using beam tunes

Kim Siyeon, Suhyeon Kim, Mehedi Masud, Juseong Park

备注：: To appear in JHEP; Appendix added; 27 pages,8 figures,2 tables

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AI总结：

本研究通过在DUNE远探测器上结合低能与中能中微子束流进行统计分析，约束了大额外维（LED）引入的参数$m_0$和$R_{\text{ED}}$的空间，并评估了各振荡通道与质量等级的影响。

摘要：

深地下中微子实验（DUNE）是中微子物理领域的一项领先实验，目前正处于建设中。DUNE旨在测量三味振荡情形中尚未知晓的参数，包括发现轻子CP破坏、确定中微子质量等级以及测量$θ_{23}$的象限。此外，DUNE的辅助目标包括探测可能由超越标准模型（BSM）的新物理引发的次主导效应。其中一种新物理场景是可能存在的大额外维（LED），它能自然地产生微小的中微子质量。LED通过两个新参数影响中微子振荡，即最轻的狄拉克质量$m_{0}$和额外维半径$R_{\text{ED}}$（$< 2$ $μ$m）。在DUNE的1300公里基线上，存在LED时，较高能量（$\gtrsim 4-5$ GeV）下的概率似乎受到更大的修正。在本研究中，我们通过对在DUNE远探测器（FD）模拟的中微子数据进行统计分析，试图约束$m_{0}$和$R_{\text{ED}}$的参数空间。我们展示了如何结合标准低能（LE）中微子束流和中能（ME）中微子束流，利用LED在较高能量下相对较大的影响来改善约束。在分析中，我们还展示了各个振荡通道（$ν_μ \to ν_{e}, ν_μ \to ν_μ, ν_μ \to ν_τ$）以及两种中微子质量等级的作用。

英文摘要：

The Deep Underground Neutrino Experiment (DUNE) is a leading experiment in neutrino physics which is presently under construction. DUNE aims to measure the yet unknown parameters in the three flavor oscillation case which includes discovery of leptonic CP violation, determination of the neutrino mass hierarchy and measuring the octant of $θ_{23}$. Additionally, the ancillary goals of DUNE include probing the subdominant effects induced by possible physics beyond the Standard Model (BSM). One such new physics scenario is the possible presence of Large Extra Dimension (LED) which can naturally give rise to tiny neutrino masses. LED impacts neutrino oscillation through two new parameters, - namely the lightest Dirac mass $m_{0}$ and the radius of the extra dimension $R_{\text{ED}}$ ($< 2$ $μ$m). At the DUNE baseline of 1300 km, the probability seems to be modified more at the higher energy ($\gtrsim 4-5$ GeV) in presence of LED. In this work, we attempt to constrain the parameter space of $m_{0}$ and $R_{\text{ED}}$ by performing a statistical analysis of neutrino data simulated at DUNE far detector (FD). We illustrate how a combination of the standard low energy (LE) neutrino beam and a medium energy (ME) neutrino beam can take advantage of the relatively large impact of LED at higher energy and improve the constraints. In the analysis we also show the role of the individual oscillation channels ($ν_μ \to ν_{e}, ν_μ \to ν_μ, ν_μ \to ν_τ$), as well as the two neutrino mass hierarchies.

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