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arXiv 1503.03248hep-phhep-ex
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非标准相互作用下中微子振荡中$CP$破坏的发现范围

The Discovery reach of $CP$ violation in neutrino oscillation with non-standard interaction effects

Zini Rahman, Arnab Dasgupta, Rathin Adhikari

摘要:

本文研究了超流、中微子工厂和单能中微子束中微子振荡实验中$CP$破坏的发现范围。对于满足较短基线的模型相关界限的NSI(如CERN Fréjus设置),NSI对$δ$导致的$CP$违规的发现范围影响不显著。特别是,对于超级束和中微子工厂,我们还考虑了相对较长的基线,这可能会对$CP$违反发现产生显着的NSI影响,达到更高的NSI允许值。对于单能束流,只考虑较短的基线,以研究不同核作为中微子源的$CP$破坏。有趣的是,对于中微子与物质的非标准相互作用-- $\varepsilon_{eμ}$和$\varepsilon_{eτ}$,在超束中较长基线传播时,有可能比中微子与物质的标准模型相互作用更好地发现$CP$破坏.对于复NSI,我们已经证明了$CP$违反发现达到狄拉克相$δ$和NSI相$ϕ_{ij}$的平面。由于某些$δ$值引起的$CP$破坏在目前和不久的将来的超束流和中微子工厂的实验设备中仍然是不可观测的。然而,在非对角NSI相位值的一定范围内,对于中微子工厂的$5 σ$,对于任何$δ_{CP}$值,都有可能发现完全的$CP$违反。我们的分析表明,对于某些值的NSI阶段总$CP$违反可能根本无法观察到的任何值的$δ$。利用$^{110}_{50}$ Sn和$^{152}$ Yb核电子捕获过程产生的中微子束,我们在中微子振荡实验中展示了$CP$破坏的发现范围。

英文摘要:

We have studied the $CP$ violation discovery reach in neutrino oscillation experiment with superbeam, neutrino factory and monoenergetic neutrino beam. For NSI satisfying model-dependent bound for shorter baselines (like CERN-Fréjus set-up ) there is insignificant effect of NSI on the the discovery reach of $CP$ violation due to $δ$. Particularly, for superbeam and neutrino factory we have also considered relatively longer baselines for which there could be significant NSI effects on $CP$ violation discovery reach for higher allowed values of NSI. For monoenergetic beam only shorter baselines are considered to study $CP$ violation with different nuclei as neutrino sources. Interestingly for non-standard interactions - $\varepsilon_{eμ}$ and $\varepsilon_{eτ}$ of neutrinos with matter during propagation in longer baselines in superbeam, there is possibility of better discovery reach of $CP$ violation than that with only Standard Model interactions of neutrinos with matter. For complex NSI we have shown the $CP$ violation discovery reach in the plane of Dirac phase $δ$ and NSI phase $ϕ_{ij}$. The $CP$ violation due to some values of $δ$ remain unobservable with present and near future experimental facilities in superbeam and neutrino factory . However, in presence of some ranges of off-diagonal NSI phase values there are some possibilities of discovering total $CP$ violation for any $δ_{CP}$ value at $5 σ$ for neutrino factory. Our analysis indicates that for some values of NSI phases total $CP$ violation may not be at all observable for any values of $δ$. Using a neutrino beam from electron capture process for nuclei $^{110}_{50}$Sn and $^{152}$Yb, we have shown the discovery reach of $CP$ violation in neutrino oscillation experiment.

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