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arXiv 0709.1980hep-phhep-ex
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用中微子工厂探测非标准中微子相互作用

Probing Non-Standard Neutrino Interactions with Neutrino Factories

N. Cipriano Ribeiro, H. Minakata, H. Nunokawa, S. Uchinami, R. Zukanovich Funchal

摘要:

我们讨论了中微子工厂测量对非标准中微子相互作用(NSI)的灵敏度范围,非标准中微子相互作用(NSI)可能作为超越标准模型的物理学的低能表现而存在。我们采用μ子出现模式ν_e --> ν_μ,并考虑两个探测器,一个在3000 km,另一个在7000 km。在假设NSI对中微子产生和探测的影响可以忽略的情况下,我们通过考察两个NSI参数ε_{αβ}对中微子传播的影响,讨论了对NSI的灵敏度以及θ_{13}和δ的同时测定,发现在θ_{13}很小的范围内,对非对角ε的灵敏度都很好。我们证明了双探测器设置足以解决θ_{13}-NSI混淆问题。我们相信,本文所获得的结果打开了一扇门,可能使用中微子工厂作为发现机器的NSI,同时保持其主要功能,进行精密测量的轻子混合参数。

英文摘要:

We discuss the sensitivity reach of a neutrino factory measurement to non-standard neutrino interactions (NSI), which may exist as a low-energy manifestation of physics beyond the Standard Model. We use the muon appearance mode ν_e --> ν_μand consider two detectors, one at 3000 km and the other at 7000 km. Assuming the effects of NSI at the production and the detection are negligible, we discuss the sensitivities to NSI and the simultaneous determination of θ_{13} and δby examining the effects in the neutrino propagation of various systems in which two NSI parameters ε_{αβ} are switched on. The sensitivities to off-diagonal ε's are found to be excellent up to small values of θ_{13}. We demonstrate that the two-detector setting is powerful enough to resolve the θ_{13}-NSI confusion problem. We believe that the results obtained in this paper open the door to the possibility of using neutrino factory as a discovery machine for NSI while keeping its primary function of performing precision measurements of the lepton mixing parameters.

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