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arXiv 1607.01745hep-phhep-exphysics.ins-det
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DUNE上$θ_{23}$八分体与中微子非标准相互作用的简并

Degeneracy between $θ_{23}$ octant and neutrino non-standard interactions at DUNE

Sanjib Kumar Agarwalla, Sabya Sachi Chatterjee, Antonio Palazzo

摘要:

以深地中微子实验(DUNE)为例,详细阐述了中微子传播过程中$θ_{23}$的八分圆简并与变味中性流非标准相互作用(NSI)之间的关系.在存在涉及$e-μ$($\varepsilon_{eμ}$)和$e-τ$($\varepsilon_{eτ}$)风味的NSI参数的情况下,长基线实验中的$ν_μ\to ν_e$和$\barν_μ\to \barν_e$出现概率获得了额外的干扰项,该干扰项取决于一个新的动态CP相$ϕ_{eμ/eτ}$。该项与与标准CP相位$δ$相关的公知干扰项相加,在确定$θ_{23}$的八分圆时产生混淆。我们表明,对于小到$few\,\%$(相对于费米耦合常数$G_{\mathrm F}$)的NSI耦合值(每次取一个),以及对于两个CP相$δ$和$ϕ_{eμ/eτ}$的不利组合,$θ_{23}$的八分圆的发现潜力完全丧失。

英文摘要:

We expound in detail the degeneracy between the octant of $θ_{23}$ and flavor-changing neutral-current non-standard interactions (NSI's) in neutrino propagation, considering the Deep Underground Neutrino Experiment (DUNE) as a case study. In the presence of such NSI parameters involving the $e-μ$ ($\varepsilon_{eμ}$) and $e-τ$ ($\varepsilon_{eτ}$) flavors, the $ν_μ\to ν_e$ and $\barν_μ\to \barν_e$ appearance probabilities in long-baseline experiments acquire an additional interference term, which depends on one new dynamical CP-phase $ϕ_{eμ/eτ}$. This term sums up with the well-known interference term related to the standard CP-phase $δ$ creating a source of confusion in the determination of the octant of $θ_{23}$. We show that for values of the NSI coupling (taken one at-a-time) as small as $few\,\%$ (relative to the Fermi coupling constant $G_{\mathrm F}$), and for unfavorable combinations of the two CP-phases $δ$ and $ϕ_{eμ/eτ}$, the discovery potential of the octant of $θ_{23}$ gets completely lost.

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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