RICE limits on the diffuse ultrahigh energy neutrino flux
RICE limits on the diffuse ultrahigh energy neutrino flux
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RICE 对漫射超高能中微子通量的限制
DOI：
10.1103/physrevd.73.082002
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发表时间：
2006
影响因子：
5
通讯作者：
E. al.
中科院分区：
文献类型：
--
作者：
I. Kravchenko;E. al.
根据南极射电冰切伦科夫实验(莱斯)自1999年至2005年收集的数据，我们给出了超高能中微子通量超过${10}^{17}\TEXT{}\MATHROM{EV}的新的限制。我们讨论了背景估计，校准和数据分析算法(在线和离线)，用于专用中微子搜索的程序，以及蒙特卡罗(MC)模拟中的改进，包括最近对复杂冰介电常数的现场测量。更大的数据集和对强子簇射的更详细的研究导致灵敏度比我们之前发表的结果提高了1个数量级以上。对整个莱斯数据集的检查发现，没有可接受的中微子候选者，导致95%的置信度模型对通量的限制${E}_{\ensuremath{\nu}}^{2}d\ensuremath{\phi}/d{E}_{\ensuremath{\nu}}l{10}^{\ensuremath{-}6}\text{}\Text{}\mathrm{GeV}/(\mathrm{c}{\mathrm{m}}^{2}\text{}\mathm{S}\Text{}\mathm{sr})$在能量范围${10}^{17}l{E}_{\ensuremath{\nu}}l{10}^{20}\text{}\TEXT{}\MATHORM{EV}$。新的莱斯结果排除了95%置信度下最强烈的通量模型预测。
We present new limits on ultrahigh energy neutrino fluxes above ${10}^{17}\text{ }\text{ }\mathrm{eV}$ based on data collected by the Radio Ice Cherenkov Experiment (RICE) at the South Pole from 1999\char21{}2005. We discuss estimation of backgrounds, calibration and data analysis algorithms (both online and offline), procedures used for the dedicated neutrino search, and refinements in our Monte Carlo (MC) simulation, including recent in situ measurements of the complex ice dielectric constant. An enlarged data set and a more detailed study of hadronic showers results in a sensitivity improvement of more than 1 order of magnitude compared to our previously published results. Examination of the full RICE data set yields zero acceptable neutrino candidates, resulting in 95% confidence-level model-dependent limits on the flux ${E}_{\ensuremath{\nu}}^{2}d\ensuremath{\phi}/d{E}_{\ensuremath{\nu}}l{10}^{\ensuremath{-}6}\text{ }\text{ }\mathrm{GeV}/(\mathrm{c}{\mathrm{m}}^{2}\text{ }\mathrm{s}\text{ }\mathrm{sr})$ in the energy range ${10}^{17}l{E}_{\ensuremath{\nu}}l{10}^{20}\text{ }\text{ }\mathrm{eV}$. The new RICE results rule out the most intense flux model projections at 95% confidence level.