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arXiv 1004.5154hep-phhep-ex
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超高能中微子源味比的测定

Determination of the Source Flavor Ratio of Ultrahigh Energy Neutrinos

T. C. Liu, M. A. Huang, Guey-Lin Lin

摘要:

本文讨论了在甚高能区的远源中微子味中微子的重建。例如,这种重建过程与探测宇宙成因中微子的确认有关。为了促进这样的重建,必须在地面中微子望远镜中实现有效的味道鉴别。我们注意到,当能量超过几十PeV时,τ轻子的行为类似于μ子的径迹。因此,虽然在这种情况下将νμ与ντ分开是相当具有挑战性的,但人们可以期望通过独特的簇射特征将νe与其余部分分开。我们给出了在中微子望远镜中味测量的预期精度和当前中微子混合参数的不确定性下味比重建的结果。结果表明,由于近似的νμ - ντ对称性,νμ和ντ事件之间的进一步分离不会改善味道重建。

英文摘要:

We discuss the reconstruction of neutrino flavor neutrino at a distant source in the very high en- ergy regime. This reconstruction procedure is relevant to the confirmation of detecting cosmogenic neutrinos, for example. To facilitate such a reconstruction, it is imperative to achieve effective flavor discriminations in terrestrial neutrino telescopes. We note that, for energies beyond few tens of PeV, a tau-lepton behaves like a track similar to a muon. Hence, while it is rather challenging to separate νμ from ντ in this case, one can expect to isolate νe from the rest by a distinctive shower signature. We present the result of flavor ratio reconstruction given the anticipated accuracies of flavor measurement in neutrino telescopes and current uncertainties of neutrino mixing parame- ters. It is shown that the further separation between νμ and ντ events does not improve the flavor reconstruction due to the approximate νμ - ντ symmetry.

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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