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arXiv 1209.5010hep-phhep-ex
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在大θ(13)年代中等基线的CP破坏和质量等级

CP violation and mass hierarchy at medium baselines in the large theta(13) era

S. Dusini, A. Longhin, M. Mezzetto, L. Patrizii, M. Sioli, G. Sirri, F. Terranova

摘要:

最近通过共振器和加速器实验测量到的θ(13)的大值为精密振荡物理学提供了前所未有的机会。本文重新考虑了中基线超束的物理范围。对于θ(13)~ 9度,我们指出,中等基线(即L ~ O(1000 km))的装置对于研究轻子区的CP破坏仍然是最佳的,尽管它们的最终精度在很大程度上取决于实验系统学。这是证明,特别是在欧洲的实际利益的设施:欧洲核子研究中心的格兰萨索和欧洲核子研究中心的Phyasalmi nu_mu梁基于目前的SPS和新的高功率50 GeV的质子驱动器。由于θ(13)的值很大,光谱信息可以在中等基线处用来解决符号模糊性,并确定中微子质量等级。然而,在较长的基线上,物质效应主导了nu_mu->nu_e跃迁,即使在中等曝光量下,也可以实现更强的符号灵敏度(Δ m^2)。

英文摘要:

The large value of theta(13) recently measured by rector and accelerator experiments opens unprecedented opportunities for precision oscillation physics. In this paper, we reconsider the physics reach of medium baseline superbeams. For theta(13) ~ 9 degree we show that facilities at medium baselines -- i.e. L ~ O(1000 km) -- remain optimal for the study of CP violation in the leptonic sector, although their ultimate precision strongly depends on experimental systematics. This is demonstrated in particular for facilities of practical interest in Europe: a CERN to Gran Sasso and CERN to Phyasalmi nu_mu beam based on the present SPS and on new high power 50 GeV proton driver. Due to the large value of theta(13), spectral information can be employed at medium baselines to resolve the sign ambiguity and determine the neutrino mass hierarchy. However, longer baselines, where matter effects dominate the nu_mu->nu_e transition, can achieve much stronger sensitivity to sign(Delta m^2) even at moderate exposures.

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