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arXiv 1209.0215hep-phhep-ex
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电子俘获中微子束中微子振荡实验中发现$CP$破坏

Discovering $CP$ violation in neutrino oscillation experiment using neutrino beam from electron capture

Zini Rahman, Rathin Adhikari

摘要:

结合最近在大亚湾和其他反应堆实验中获得的$θ_{13}$值,我们研究了在研究轻子扇区$CP$破坏时考虑单能中微子束的前景。利用电子俘获过程产生的中微子束,在130 Km和250 Km两个基线上,用WaterCherenkov探测器,给出了中微子振荡实验中$CP$破坏的发现范围。特别是对于$^{110}_{50}$ Sn核$CP$违反可以发现约80%的可能的$δ$值的基线为130公里的助推因子$γ= 500$。这一结果是在中微子能量分辨率的保守选择下,利用探测器处可能的顶点分辨率并考虑到光束扩散而得到的。核$^{152}$ Yb虽然在技术上更适合于产生单能束,但被发现不太适合于$CP$破坏的良好发现范围。

英文摘要:

Considering the recently obtained value of $θ_{13}$ from Daya Bay and other reactor experiments we have studied the prospects of considering mono-energetic neutrino beam in studying $CP$ violation in the leptonic sector. Using a neutrino beam from electron capture process for nuclei $^{110}_{50}$Sn and $^{152}$Yb and considering two baselines - 130 Km and 250 Km with Water Cherenkov detector, we have shown the discovery reach of $CP$ violation in neutrino oscillation experiment. Particularly for $^{110}_{50}$Sn nuclei $CP$ violation could be found for about 80% of the possible $δ$ values for a baseline of 130 km with boost factor $γ= 500$. This result is obtained with conservative choice of neutrino energy resolution using the possible vertex resolution at the detector and taking into account beam spreading. The nuclei $^{152}$Yb is although more suitable technically for the production of mono-energetic beam, but is found to be not so suitable for good discovery reach of $CP$ violation.

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