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arXiv 0802.0086hep-ph
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用Silver通道求解八分圆简并度

Solving the octant degeneracy with the Silver channel

D. Meloni

摘要:

我们研究了金($ν_e \to ν_μ$)和银($ν_e \to ν_τ$)通道的组合,以解决八分体简并影响测量$θ_{13}$和$δ$在未来的中微子工厂的潜力。为了寻找在$ν_τ$荷电相互作用中产生的$τ$轻子,我们考虑了两种不同的探测器:乳胶云室探测器(ECC)和液氩时间投影室(LAr TPC)。我们表明,当使用类似的检测器质量,升级版本的ECC检测器(也对强子$τ$衰变模式敏感)和LAr TPC检测器具有可比的$θ_{23}$的八分圆的灵敏度,能够区分$\sin^2 (2θ_{13}) \gtrsim 10^{-3}$在3 $σ$水平的两个解决方案,如果$θ_{23}=40^\circ$。我们还表明,如果$θ_{13}$接近其上限,则相同的设置能够看到与最大混合的偏差小至$\sim$(4-6)%(在3 $σ$)。

英文摘要:

We study the potential of the combination of the golden ($ν_e \to ν_μ$) and silver ($ν_e \to ν_τ$) channels to solve the octant degeneracy affecting the measurement of $θ_{13}$ and $δ$ at future neutrino factories. To search for $τ$ leptons produced in $ν_τ$ charged-current interactions, we consider two different detectors: the Emulsion Cloud Chamber detector (ECC) and the Liquid Argon Time Projection Chamber (LAr TPC). We show that, when using similar detector masses, the upgraded version of the ECC detector (sensitive also to hadronic $τ$ decay modes) and the LAr TPC detector have comparable sensitivities to the octant of $θ_{23}$, being able to discriminate the two solutions for $\sin^2 (2θ_{13}) \gtrsim 10^{-3}$ at 3$σ$ level if $θ_{23}=40^\circ$. We also show that the same setups are able to see deviation from maximal mixing as small as $\sim$ (4-6)% (at 3$σ$) if $θ_{13}$ is close to its upper bound.

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