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arXiv 0911.3776hep-ph
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关于低能中微子工厂的改进

On the improvement of the low energy neutrino factory

Enrique Fernandez-Martinez, Tracey Li, Olga Mena, Silvia Pascoli

摘要:

低能中微子工厂被认为是未来研究CP破坏和物质效应的一个非常敏感的装置。在这里,我们研究如何影响其性能时,实验规格的设置是不同的。最值得注意的是,我们已经考虑添加“铂”nu_{mu} -> nu_{e}通道。我们发现,虽然理论上额外的通道提供了非常有用的补充信息,并有助于解除简并,其实际用途是失去考虑现实的背景水平时。相反,“黄金”nu_{e} -> nu_{mu}通道中统计数据的增加以及能量分辨率的某种程度上的改进导致设施性能的重要增加,这是因为“黄金”通道在这些能量下具有丰富的能量依赖性。我们发现,一个基线为1300 km,μ子能量为4.5 GeV的低能中微子工厂,无论是20 kton的全主动中微子探测器还是100 kton的液氩探测器,都能对中微子振荡参数θ 13,δ和质量等级具有突出的灵敏度。对于我们估计的每μ子极性2.8 x 10^{23} kton x衰变的曝光量,低能中微子工厂对sin^{2}(2 θ 13)> 10^{-4}的θ 13和δ敏感,对sin ^{2}(2 θ 13)> 10^{-3}的质量等级敏感。

英文摘要:

The low energy neutrino factory has been proposed as a very sensitive setup for future searches for CP violation and matter effects. Here we study how its performance is affected when the experimental specifications of the setup are varied. Most notably, we have considered the addition of the 'platinum' nu_{mu} -> nu_{e} channel. We find that, whilst theoretically the extra channel provides very useful complementary information and helps to lift degeneracies, its practical usefulness is lost when considering realistic background levels. Conversely, an increase in statistics in the 'golden' nu_{e} -> nu_{mu} channel and, to some extent, an improvement in the energy resolution, lead to an important increase in the performance of the facility, given the rich energy dependence of the 'golden' channel at these energies. We show that a low energy neutrino factory with a baseline of 1300 km, muon energy of 4.5 GeV, and either a 20 kton totally active scintillating detector or 100 kton liquid argon detector, can have outstanding sensitivity to the neutrino oscillation parameters theta13, delta and the mass hierarchy. For our estimated exposure of 2.8 x 10^{23} kton x decays per muon polarity, the low energy neutrino factory has sensitivity to theta13 and delta for sin^{2}(2theta13) > 10^{-4} and to the mass hierarchy for sin^{2}(2theta13) > 10^{-3}.

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