arXiv 2009.050612020-09hep-phhep-ex

高能束调谐对DUNE标准未知数灵敏度的影响

Impact of high energy beam tunes on the sensitivities to the standard unknowns at DUNE

Jogesh Rout, Samiran Roy, Mehedi Masud, Mary Bishai, Poonam Mehta

备注：: 15 pages, 10 figures. v2 : to appear in Phys. Rev. D
发表信息：: Phys. Rev. D 102, 116018 (2020)
DOI：: 10.1103/PhysRevD.102.116018

摘要：

尽管中微子振荡已经被确定，但仍有一些关于轻子电荷宇称违反（CPV）、质量等级（MH）和$θ_{23}$八分体简并度的问题没有得到解答。解决这些问题是至关重要的，在当前和未来的中微子实验，包括深地下中微子实验（DUNE），其基线为1300公里。在标准模式下，DUNE预期以{ \textit{low energy} }（LE）调谐束运行，该调谐束在第一振荡最大值（$2-3$ GeV）附近达到峰值（然后随着我们进入更高能量而急剧下降）。然而，在长基线中微子设施（LBNF）可用的光束的宽带性质允许在利用光束调谐的灵活性，也非常适合在更高的能量。在这项工作中，我们利用了一个光束，提供高统计在较高的能量，这是被称为{ \textit{medium energy} }（ME）光束。这不仅打开了探索通常的振荡通道的可能性，而且打开了探索$ν_μ \to ν_τ$振荡通道的可能性，否则该振荡通道是不可访问的。我们的目标是找到一个最佳组合的光束调谐和运行时间（总运行时间保持固定）分布在中微子和反中微子模式，导致这些参数的灵敏度在DUNE的改善。在我们的分析中，我们将所有三个渠道（$ν_μ \to ν_{e}, ν_μ \to ν_μ, ν_μ \to ν_τ$），并制定了一个在$Δχ^2$的水平上的灵敏度的相对贡献的理解。最后，我们使用束调谐以及中微子和反中微子模式获得了运行时间的优选组合，这导致对中微子振荡物理中当前未知量的灵敏度增强，即，CPV、MH和$θ_{23}$八分体。

英文摘要：

Even though neutrino oscillations have been conclusively established, there are a few unanswered questions pertaining to leptonic Charge Parity violation (CPV), mass hierarchy (MH) and $θ_{23}$ octant degeneracy. Addressing these questions is of paramount importance at the current and future neutrino experiments including the Deep Underground Neutrino Experiment (DUNE) which has a baseline of 1300 km. In the standard mode, DUNE is expected to run with a {\textit{low energy}} (LE) tuned beam which peaks around the first oscillation maximum ($2-3$ GeV) (and then sharply falls off as we go to higher energies). However, the wide band nature of the beam available at long baseline neutrino facility (LBNF) allows for the flexibility in utilizing beam tunes that are well-suited at higher energies as well. In this work, we utilize a beam that provides high statistics at higher energies which is referred to as the {\textit{medium energy}} (ME) beam. This opens up the possibility of exploring not only the usual oscillation channels but also the $ν_μ \to ν_τ$ oscillation channel which was otherwise not accessible. Our goal is to find an optimal combination of beam tune and runtime (with the total runtime held fixed) distributed in neutrino and antineutrino mode that leads to an improvement in the sensitivities of these parameters at DUNE. In our analysis, we incorporate all the three channels ($ν_μ \to ν_{e}, ν_μ \to ν_μ, ν_μ \to ν_τ$) and develop an understanding of their relative contributions in sensitivities at the level of $Δχ^2$. Finally, we obtain the preferred combination of runtime using both the beam tunes as well as neutrino and antineutrino mode that lead to enhanced sensitivity to the current unknowns in neutrino oscillation physics i.e., CPV, MH and $θ_{23}$ octant.

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