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arXiv 1703.07136hep-ph
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T2HK和T2HKK实验中的物质效应

Matter effects at the T2HK and T2HKK experiments

Sushant K. Raut

摘要:

确定中微子质量等级和测量CP破坏相$δ_{CP}$是当今中微子物理的两个主要目标。即将进行的T2 HK(具有小物质效应和高统计量)和DUNE(具有大物质效应)实验已被证明分别对$δ_{CP}$和中微子质量等级具有出色的灵敏度。最近的T2HKK建议旨在通过将HK探测器的两个罐中的一个放置在韩国的一个站点来提高T2HK的层次灵敏度,以收集$\sim 1100$ km基线处的数据。鉴于DUNE无论如何都会在$\sim 1300$ km处收集数据,我们将探讨是否有利于收集T2 HKK提出的额外长基线数据,或通过将两个探测器罐都保留在日本来提高“常规”T2 HK的$δ_{CP}$精度。我们通过比较这两个选项与DUNE的物理范围来做到这一点。我们发现,DUNE+T2HKK是更好地排除错误的层次结构,达到$Δχ^2 > 175$的真实参数无关。虽然DUNE+T2HK可以在参数空间的某些部分更精确地测量$δ_{CP}$,但DUNE+T2HK和DUNE+T2HKK在当前最佳拟合点附近表现同样良好,给出了大约$15^\circ$的$δ_{CP}$宽度。T2HKK设置允许我们关联和约束从相同源收集数据的两个探测器之间的系统误差,这可以将实验的灵敏度提高高达25%。这种系统误差的减小对于确定更重要的振荡参数是至关重要的。

英文摘要:

Determining the neutrino mass hierarchy and measuring the CP-violating phase $δ_{CP}$ are two of the main aims in neutrino physics today. The upcoming T2HK (with small matter effects and high statistics) and DUNE (with large matter effects) experiments have been shown to have excellent sensitivity to $δ_{CP}$ and the neutrino mass hierarchy, respectively. The recent T2HKK proposal aims to improve the hierarchy sensitivity of T2HK by placing one of the two tanks of the HK detector at a site in Korea, to collect data at $\sim 1100$ km baseline. In light of the fact that DUNE will anyway collect data at $\sim 1300$ km, we explore whether it is advantageous to collect additional long-baseline data as proposed with T2HKK, or to enhance the $δ_{CP}$-precision with the `conventional' T2HK by keeping both detector tanks in Japan. We do this by comparing the physics reach of these two options in conjunction with DUNE. We find that DUNE+T2HKK is better at excluding the wrong hierarchy, reaching $Δχ^2 > 175$ irrespective of the true parameters. While DUNE+T2HK can measure $δ_{CP}$ with more precision in some parts of the parameter space, both DUNE+T2HK and DUNE+T2HKK perform equally well near the current best-fit point, giving a $δ_{CP}$ width of around $15^\circ$. The T2HKK setup allows us to correlate and constrain the systematic errors between the two detectors collecting data from the same source, which can increase the sensitivity of the experiment by up to 25\%. Such a reduction of the systematic errors is crucial for determining the oscillation parameters with greater significance.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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