arXiv 2103.134312021-03-24hep-phhep-ex

具有非标准相互作用物质中中微子质量混合参数的演化

Evolution of Neutrino Mass-Mixing Parameters in Matter with Non-Standard Interactions

Sanjib Kumar Agarwalla, Sudipta Das, Mehedi Masud, Pragyanprasu Swain

备注：: 37 pages, 13 figures, 2 tables. Comments are welcome
DOI：: 10.1007/JHEP11(2021)094

摘要：

研究了中微子在轻子味守恒和轻子味破坏的中性流非标准相互作用下，物质效应在中微子振荡参数演化中的作用.我们推导出简单的近似解析表达式，显示了在标准相互作用（SI）和SI+NSI（考虑真实NSI参数的正值和负值）存在下，物质中质量混合参数随能量的演化/运行。我们观察到只有（2，3）块中的NSI参数，即$\varepsilon_{μτ}$和$(γ- β) \equiv (\varepsilon_{ττ} - \varepsilon_{μμ})$影响$θ_{23}$的运行。尽管所有的NSI参数都影响$θ_{13}$的演化，但$\varepsilon_{eμ}$和$\varepsilon_{eτ}$在与DUNE相关的能量处显示出更强的影响。在SI和SI+NSI病例中，$θ_{12}$随着能量的增加迅速接近$\sim$ $90^{\circ}$。与SI和SI+NSI框架中的$Δm^2_{31,m}$相比，$Δm^2_{21,m}$的变化非常显著。翻转NSI参数的符号会改变质量混合参数随能量变化的方式。我们证明了我们的方法在解决与中微子振荡相关的几个重要特征方面的实用性，例如：a）解开$θ_{23}$和NSI参数之间的感兴趣的简并性，b）当物质中的$θ_{13}$变为最大时，估计存在NSI时的共振能量，c）、计算出在不同NSI存在下，$ν_μ$ $\rightarrow$ $ν_{e}$跃迁中具有最大物质效应所需的基线和能量参数，和d）研究NSI参数$\varepsilon_{μτ}$和$(γ- β)$对$ν_μ \to ν_μ$存活概率的影响。

英文摘要：

We explore the role of matter effect in the evolution of neutrino oscillation parameters in the presence of lepton-flavor-conserving and lepton-flavor-violating neutral-current non-standard interactions (NSI) of the neutrino. We derive simple approximate analytical expressions showing the evolution/running of mass-mixing parameters in matter with energy in the presence of standard interactions (SI) and SI+NSI (considering both positive and negative values of real NSI parameters). We observe that only the NSI parameters in the (2,3) block, namely $\varepsilon_{μτ}$ and $(γ- β) \equiv (\varepsilon_{ττ} - \varepsilon_{μμ})$ affect the running of $θ_{23}$. Though all the NSI parameters influence the evolution of $θ_{13}$, $\varepsilon_{eμ}$ and $\varepsilon_{eτ}$ show a stronger impact at the energies relevant for DUNE. $θ_{12}$ quickly approaches to $\sim$ $90^{\circ}$ with increasing energy in both SI and SI+NSI cases. The change in $Δm^2_{21,m}$ is quite significant as compared to $Δm^2_{31,m}$ both in SI and SI+NSI frameworks. Flipping the signs of the NSI parameters alters the way in which mass-mixing parameters run with energy. We demonstrate the utility of our approach in addressing several important features related to neutrino oscillation such as: a) unraveling interesting degeneracies between $θ_{23}$ and NSI parameters, b) estimating the resonance energy in presence of NSI when $θ_{13}$ in matter becomes maximal, c) figuring out the required baselines and energies to have maximal matter effect in $ν_μ$ $\rightarrow$ $ν_{e}$ transition in the presence of different NSI parameters, and d) studying the impact of NSI parameters $\varepsilon_{μτ}$ and $(γ- β)$ on the $ν_μ \to ν_μ$ survival probability.

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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英文摘要：

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