arXiv 1209.59732012-09-26hep-phhep-ex

大$θ_{13}$长基线中微子振荡的系统不确定性

Systematic uncertainties in long-baseline neutrino oscillations for large $θ_{13}$

Pilar Coloma, Patrick Huber, Joachim Kopp, Walter Winter

备注：: 35 pages, 6 figures
DOI：: 10.1103/PhysRevD.87.033004

摘要：

我们研究了未来长基线中微子振荡实验在大$θ_{13}$的物理潜力，特别关注系统的不确定性。我们讨论了超级光束，\bbeams，和中微子工厂，并首次比较这些实验在平等的基础上的系统误差。我们明确地模拟近探测器的所有实验中，我们使用相同的实现系统的不确定性的所有实验，我们完全相关的探测器，振荡通道和光束偏振之间的不确定性适当。作为我们的主要性能指标，我们使用可达到的精度在测量的CP违反阶段$\deltacp$。我们发现，中微子工厂是唯一的仪器，可以测量$\deltacp$的精度类似于它的夸克部门对应。所有的中微子束在峰值能量$\gtrsim 2$ GeV的操作是相当强大的系统的不确定性，而特别是\bbeams和\thk遭受大的横截面的准弹性制度的不确定性，加上他们无法测量的外观信号横截面在附近的检测器。一个值得注意的例外是$γ=100$ \bbeam与基于\spl的超束的组合，其中所有相关的横截面可以以自洽的方式测量。这提供了仅次于中微子工厂的性能。对于其他超束实验，如\lbno和设置研究的上下文中的\lbne重新配置的努力，统计结果是瓶颈。在几乎所有的情况下，近检测器是不关键的控制系统，因为组合适合的出现和消失的数据已经约束系统的影响是小的，提供了三个活性风味振荡框架是有效的。

英文摘要：

We study the physics potential of future long-baseline neutrino oscillation experiments at large $θ_{13}$, 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 $\gtrsim 2$ 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, 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.

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