欧洲空间源轻子混合矩阵的非么正性
Nonunitarity of the lepton mixing matrix at the European Spallation Source
摘要：
如果中微子通过交换轻子介质获得质量，如在跷跷板方案中，由于轻子混合矩阵的有效非幺正性，在振荡实验中的中微子出现概率被修改。这也导致了新的CP阶段和模糊的“常规”阶段的三中微子范式的基础。我们研究了在非么正性存在下，基于欧洲空间源中微子超束（ESSnuSB）实验的各种装置的CP灵敏度。我们还研究了它在约束相关的新物理参数方面的潜力。此外，我们还展示了DUNE和ESSnuSB的组合如何有助于进一步提高非幺正性参数的灵敏度。
英文摘要：
If neutrinos get mass through the exchange of lepton mediators, as in seesaw schemes, the neutrino appearance probabilities in oscillation experiments are modified due to effective nonunitarity of the lepton mixing matrix. This also leads to new CP phases and an ambiguity in underpinning the ''conventional'' phase of the three-neutrino paradigm. We study the CP sensitivities of various setups based at the European spallation source neutrino super-beam (ESSnuSB) experiment in the presence of nonunitarity. We also examine its potential in constraining the associated new physics parameters. Moreover, we show how the combination of DUNE and ESSnuSB can help further improve the sensitivities on the nonunitarity parameters.
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