Systematic uncertainties in long-baseline neutrino oscillations for large θ13
Systematic uncertainties in long-baseline neutrino oscillations for large θ13
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DOI：
10.1103/physrevd.87.033004
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发表时间：
2012-09
影响因子：
5
通讯作者：
P. Coloma;P. Huber;J. Kopp;W. Winter
中科院分区：
文献类型：
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作者：
P. Coloma;P. Huber;J. Kopp;W. Winter
我们研究了未来长基线中微子振荡实验在大型θ₁₃上的物理潜力，特别是系统的不确定性。我们讨论了超束、超束和中微子工厂，并第一次就系统误差在同等基础上比较了这些实验。我们为所有实验显式地模拟近探测器，我们为所有实验使用相同的系统不确定度实现，并且我们适当地完全关联探测器、振荡通道和光束偏振之间的不确定度。作为我们的主要性能指标，我们使用可实现的精度来测量违反阶段$\deltakp$的CP。我们发现，中微子工厂是唯一一台能够以类似于夸克扇形对应物的精度测量$\deltakp$的仪器。所有工作在峰值能量≳2GeV的中微子束对于系统的不确定度都是相当稳健的，而特别是束流和中微子束在准弹性区受到很大的截面不确定，并且它们不能测量在探测器附近的出现信号截面。一个值得注意的例外是γ=100b波束和基于SPL的超波束的组合，其中所有相关的横截面都可以以自洽的方式测量。这提供了一种性能更高、仅次于中微子工厂的性能。对于其他的超束实验，如\lbno和在重新配置工作的背景下研究的设置，统计数据被证明是瓶颈。在几乎所有的情况下，近检测器对控制系统学不是关键，因为如果三种有效的风味振荡框架有效，出现和消失数据的组合拟合已经将系统学的影响限制在很小的范围内。“更少”
We study the physics potential of future long-baseline neutrino oscillation experiments at large θ₁₃, focusing especially on systematic uncertainties. We discuss superbeams, \bbeams, and neutrino factories, and for the first time compare these experiments on an equal footing with respect to systematic errors. We explicitly simulate near detectors for all experiments, we use the same implementation of systematic uncertainties for all experiments, and we fully correlate the uncertainties among detectors, oscillation channels, and beam polarizations as appropriate. As our primary performance indicator, we use the achievable precision in the measurement of the CP violating phase $\deltacp$. We find that a neutrino factory is the only instrument that can measure $\deltacp$ with a precision similar to that of its quark sector counterpart. All neutrino beams operating at peak energies ≳2 GeV are quite robust with respect to systematic uncertainties, whereas especially \bbeams and \thk suffer from large cross section uncertainties in the quasi-elastic regime, combined with their inability to measure the appearance signal cross sections at the near detector. A noteworthy exception is the combination of a γ =100 \bbeam with an \spl-based superbeam, in which all relevant cross sections can be measured in a self-consistent way. This provides a performance, more » second only to the neutrino factory. For other superbeam experiments such as \lbno and the setups studied in the context of the \lbne reconfiguration effort, statistics turns out to be the bottleneck. In almost all cases, the near detector is not critical to control systematics since the combined fit of appearance and disappearance data already constrains the impact of systematics to be small provided that the three active flavor oscillation framework is valid. « less