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arXiv 1009.4869hep-phhep-ex
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对物质效应敏感的太阳中微子观测

Solar Neutrino Observables Sensitive to Matter Effects

Hisakazu Minakata, Carlos Pena-Garay

摘要:

利用当前和未来的太阳中微子观测资料,讨论了模拟电子中微子强弱物质势效应的系数A_{MSW}的约束条件。根据现有的太阳中微子数据,在1σ(3σ)CL处的束缚A_{MSW} = 1.47^{-0.42}_{+0.54}(^{-0.82}_{+1.88}),这与标准模型预测的A_{MSW} = 1是一致的。对于较弱的物质势(A_{MSW} < 1),来自平坦^8 B中微子谱的约束已经非常紧密,这表明存在物质效应的证据。而对于较强的物质势(A_{MSW} > 1),束缚较弱,并且由超级神冈最近观测到的^8 B中微子通量的昼夜不对称性所主导。在正在进行的和未来的太阳中微子实验中,我们发现(1)提高^8 B中微子昼夜不对称性的精度,(2)对低能准单能中微子的精确测量,(3)探测到低能^8 B中微子谱的上升,是改善A_{MSW}束缚的最佳选择。

英文摘要:

We discuss constraints on the coefficient A_{MSW} which is introduced to simulate the effect of weaker or stronger matter potential for electron neutrinos with the current and future solar neutrino data. The currently available solar neutrino data leads to a bound A_{MSW} = 1.47^{-0.42}_{+0.54} (^{-0.82}_{+1.88}) at 1σ(3σ) CL, which is consistent with the Standard Model prediction A_{MSW} = 1. For weaker matter potential (A_{MSW} < 1), the constraint which comes from the flat ^8B neutrino spectrum is already very tight, indicating the evidence for matter effects. Whereas for stronger matter potential (A_{MSW} > 1), the bound is milder and is dominated by the day-night asymmetry of ^8B neutrino flux recently observed by Super-Kamiokande. Among the list of observable of ongoing and future solar neutrino experiments, we find that (1) an improved precision of the day-night asymmetry of ^8B neutrinos, (2) precision measurements of the low energy quasi-monoenergetic neutrinos, and (3) the detection of the upturn of the ^8B neutrino spectrum at low energies, are the best choices to improve the bound on A_{MSW}.

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