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arXiv 0708.0152hep-phhep-ex
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反应堆和超束实验中的非标准中微子相互作用

Non-standard neutrino interactions in reactor and superbeam experiments

Joachim Kopp, Manfred Lindner, Toshihiko Ota, Joe Sato

摘要:

非标准的四费米子相互作用的形式主义提供了一种方便的、独立于模型的方式来参数化一大类"新物理“场景。在这篇文章中,我们研究了在这种非标准相互作用(NSI)的存在下,反应堆和超束中微子实验的性能。由于标准振幅和非标准振幅之间的干扰,如果NSI参数接近其当前上限,则预计会产生相当大的影响。我们推导出包括NSI的相关振荡概率的近似公式,并展示了即使没有任何计算,也可以直观地理解主导效应。我们将提出一个分类的所有可能的NSI根据其对反应堆和超束实验的影响,它会证明,这些实验是高度互补的非标准参数的灵敏度。本文的第二部分是详细的数值模拟,这将证明如何一个标准的振荡适合的混合角θ-13可能会失败,如果实验数据受到NSI。我们发现,对于一些非标准的条款,反应堆和超级束实验将产生看似矛盾的结果,而在其他情况下,他们可能会同意彼此,但所得到的值θ-13可能是远离真实值。这个偏移量可能很大,甚至错误地排除了真正的θ-13。在本文的最后一节中,我们证明了反应堆和超级束的数据实际上可以建立非标准相互作用的存在。在我们的讨论中,我们特别注意复杂相位和近探测器的影响。

英文摘要:

The formalism of non-standard four-fermion interactions provides a convenient, model-independent way of parameterizing a wide class of ``new physics'' scenarios. In this article, we study the performance of reactor and superbeam neutrino experiments in the presence of such non-standard interactions (NSI). Due to interference between the standard and non-standard amplitudes, sizeable effects are to be expected if the NSI parameters are close to their current upper limits. We derive approximate formulas for the relevant oscillation probabilities including NSI, and show how the leading effects can be understood intuitively even without any calculations. We will present a classification of all possible NSI according to their impact on reactor and superbeam experiments, and it will turn out that these experiments are highly complementary in terms of their sensitivity to the non-standard parameters. The second part of the paper is devoted to detailed numerical simulations, which will demonstrate how a standard oscillation fit of the mixing angle theta-13 may fail if experimental data is affected by NSI. We find that for some non-standard terms, reactor and superbeam experiments would yield seemingly conflicting results, while in other cases, they may agree well with each other, but the resulting value for theta-13 could be far from the true value. This offset may be so large that the true theta-13 is even ruled out erroneously. In the last section of the paper, we demonstrate that reactor and superbeam data can actually establish the presence of non-standard interactions. Throughout our discussion, we pay special attention to the impact of the complex phases, and of the near detectors.

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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