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arXiv 0912.2676hep-ph
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电子俘获中微子束的CP破坏范围

CP-violation reach of an electron capture neutrino beam

Christopher Orme

摘要:

本文扩展了Bernabeu和Espinoza的工作,通过研究$^{150}$ Dy电子捕获束的CP破坏范围,通过两个洛伦兹助推器的变化,有用的电子捕获衰减的数量,每个助推器的相对运行时间和大气背景的数量。中微子被认为是来源于欧洲核子研究中心的升级SPS,并被导向位于Canfranc实验室的440 kton Water Cerenkov探测器。对于加强配对,发现两个大的“CP覆盖”选择; $δ$ -对于$(γ_{1}, γ_{2})$的对称覆盖=(280,160)和$δ$ -对于$(γ_{1}, γ_{2})$的不对称覆盖=(440,150)。在每年$N_{\rm ions} = 10^{18}$离子的标称有用衰变速率的情况下,$δ$对称设置可以排除CP守恒低至$\sin^{2}2θ_{13} = 3\cdot 10^{-4}$。为了使$δ< 0$和$δ> 0$都达到$\sin^{2}2θ_{13} = 1\cdot 10^{-3}$,每年需要$N_{\rm ions} = 6\cdot 10^{17}$离子的有效衰变率。

英文摘要:

This article extends the work of Bernabeu and Espinoza by examining the CP-violation reach of a $^{150}$Dy electron capture beam through the variation of the two Lorentz boosts, the number of useful electron capture decays, the relative run time of each boost and the number of atmospheric backgrounds. The neutrinos are assumed to be sourced at CERN with an upgraded SPS and are directed towards a 440 kton Water Cerenkov detector located at the Canfranc laboratory. Two large `CP-coverage' choices for the boost pairings are found; a $δ$-symmetrical coverage for $(γ_{1}, γ_{2})$ = (280, 160) and an $δ$-asymmetric coverage for $(γ_{1}, γ_{2})$ = (440,150). With a nominal useful decay rate of $N_{\rm ions} = 10^{18}$ ions per year, the $δ$-symmetric setup can rule out CP-conservation down to $\sin^{2}2θ_{13} = 3\cdot 10^{-4}$. To reach $\sin^{2}2θ_{13} = 1\cdot 10^{-3}$ for both $δ< 0$ and $δ> 0$ requires a useful decay rate of $N_{\rm ions} = 6\cdot 10^{17}$ ions per year.

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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