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arXiv 0704.0388hep-ph
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CNGS的无菌中微子

Sterile neutrinos at the CNGS

A. Donini, M. Maltoni, D. Meloni, P. Migliozzi, F. Terranova

摘要:

我们研究了CNGS束在约束一个模型的参数空间中的潜力,该模型具有一个由$\mathcal{O}(\eVq)$质量平方差$\Dmq_\Sbl$从三个活跃中微子中分离出来的无菌中微子。我们使用OPERA探测器作为参考进行分析(我们的分析可以升级,包括对ICARUS探测器的详细模拟)。我们指出,在CNGS束上,约束无菌中微子参数空间的最大潜力的通道是$ν_μ\to ν_τ$。其原因有两个:第一,控制这种振荡的活性-无菌混合角受目前实验的约束较小;第二,这是OPERA和ICARUS设计的信号,因此受益于极低的背景。在我们的分析中,我们还考虑了$ν_μ\to ν_e$振荡。我们发现,CNGS寻找无菌中微子的潜力受到束流名义强度的限制,但随着中微子通量增加2到10倍,它会显着增强。在这种情况下,来自两个通道的数据使我们能够进一步约束四中微子模型参数空间。我们的结果适用于任何值的$\Dmq_\Sbl \gtrsim 0.1 \eVq$,\textit{i.e.}时,由这个质量平方差驱动的振荡平均。我们还检查了$θ_{13}$的束缚,可以把在CNGS不受可能存在的不育中微子。

英文摘要:

We study the potential of the CNGS beam in constraining the parameter space of a model with one sterile neutrino separated from three active ones by an $\mathcal{O}(\eVq)$ mass-squared difference, $\Dmq_\Sbl$. We perform our analysis using the OPERA detector as a reference (our analysis can be upgraded including a detailed simulation of the ICARUS detector). We point out that the channel with the largest potential to constrain the sterile neutrino parameter space at the CNGS beam is $ν_μ\to ν_τ$. The reason for that is twofold: first, the active-sterile mixing angle that governs this oscillation is the less constrained by present experiments; second, this is the signal for which both OPERA and ICARUS have been designed, and thus benefits from an extremely low background. In our analysis we also took into account $ν_μ\to ν_e$ oscillations. We find that the CNGS potential to look for sterile neutrinos is limited with nominal intensity of the beam, but it is significantly enhanced with a factor 2 to 10 increase in the neutrino flux. Data from both channels allow us, in this case, to constrain further the four-neutrino model parameter space. Our results hold for any value of $\Dmq_\Sbl \gtrsim 0.1 \eVq$, \textit{i.e.} when oscillations driven by this mass-squared difference are averaged. We have also checked that the bound on $θ_{13}$ that can be put at the CNGS is not affected by the possible existence of sterile neutrinos.

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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