Search for sterile neutrino oscillation using RENO and NEOS data.

Z. Atif, J. Choi, B. Han, C. Jang, H. Jang, J. Jang, E. Jeon, S. Jeon, K. Joo, K. Ju, D. Jung, H. Kim, H. Kim, J. G. Kim, J. Kim, B. R. Kim, J. Kim, S. Kim, S. Y. Kim, W. Kim, Y. Kim, Y. Ko, E. Kwon, D. H. Lee, H. Lee, J. Lee, J. Lee, M. H. Lee, Y. Oh, I. Lim, D. Moon, H. Park, H. Park, K. Park, M. Pac, H. Seo, J. Seo, K. Seo, C. Shin, K. Siyeon, G. Sun, B. Yang, J. Yoo, S. Yoon, I. Yeo, I. Yu
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引用次数: 16

Abstract

We present a model independent search for sterile neutrino oscillation using 2\,508.9\,days of RENO near detector data and a NEOS published result. The reactor related systematic uncertainties are significantly suppressed as both detectors are located at the same reactor complex of Hanbit Nuclear Power Plant. The search is performed by electron antineutrino ($\overline{\nu}_e$) disappearance between six reactors and two detectors with baselines of 294\,m (RENO) and 24\,m (NEOS). A spectral comparison of the NEOS prompt-energy spectrum with a prediction from the RENO measurement can explore reactor $\overline{\nu}_e$ oscillations to sterile neutrino. Based on the spectral comparison, we obtain a 90\% C.L. excluded region of $10^{-3}<|\Delta m_{41}^2|<7$\,eV$^2$. We also obtain a 68\% C.L. allowed region with the best fit of $|\Delta m_{41}^2|=2.37\,\pm\,0.03\,$\,eV$^2$ and $\sin^2 2\theta_{14}$=0.09$\,\pm\,$0.03. Comparisons of obtained reactor antineutrino spectra at reactor sources are made among RENO, NEOS and Daya Bay to find a possible spectral variation. The unfolded reactor antineutrino spectra will be useful for studying reactor neutrino physics and particle physics beyond the Standard Model.
利用RENO和NEOS数据搜索惰性中微子振荡。
我们提出了一个独立于模型的无菌中微子振荡搜索,使用了2\,508.9\,天的RENO近探测器数据和NEOS发表的结果。由于两个探测器都位于汉比特核电站的同一个反应堆群中,与反应堆相关的系统不确定性被显著抑制。通过电子反中微子($\overline{\nu}_e$)消失在6个反应堆和2个探测器之间进行搜索,基线为294\,m (RENO)和24\,m (NEOS)。NEOS提示能量谱与RENO测量预测的光谱比较可以探索反应堆$\overline{\nu}_e$到无菌中微子的振荡。通过光谱比较,我们得到了$10^{-3}<|\Delta m_{41}^2|<7$ \,eV $^2$的90% C.L.排除区。我们还获得了68% C.L.允许区域,其最佳拟合为$|\Delta m_{41}^2|=2.37\,\pm\,0.03\,$ \,eV $^2$和$\sin^2 2\theta_{14}$ =0.09 $\,\pm\,$ 0.03。比较了RENO、NEOS和大亚湾三处反应堆源处的反中微子谱,找出了可能的谱变化。展开的反应堆反中微子谱对于研究超出标准模型的反应堆中微子物理和粒子物理是有用的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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