Prospects for detecting the diffuse supernova neutrino background with JUNO
Prospects for detecting the diffuse supernova neutrino background with JUNO
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DOI：
10.1088/1475-7516/2022/10/033
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发表时间：
2022-05
影响因子：
6.4
通讯作者：
Juno collaboration Angel Abusleme;T. Adam;Shakeel Ahmad;Rizwan Ahmed;S. Aiello;M. Akram;F. An
中科院分区：
文献类型：
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作者：
Juno collaboration Angel Abusleme;T. Adam;Shakeel Ahmad;Rizwan Ahmed;S. Aiello;M. Akram;F. An
利用自由质子的逆β衰变(IBD)探测通道，给出了江门地下中微子观测站弥散超新星中微子背景(DSNB)的探测潜力。我们使用了关于DSNB通量预报的最新信息，并详细地研究了在Juno进行DSNB搜索的背景及其减少。大气中微子诱导的中性流(NC)背景被证明是最关键的背景，其不确定性从模式预测的传播和设想的现场测量两个方面进行了仔细的评估。本文还对脉冲形状鉴别(PSD)和三重符合(TC)截断的背景抑制进行了详细的研究。通过最新的数字SNB信号预测，更现实的背景评估和PSD效率优化，以及额外的TC削减，JUNO可以在3年的数据采集中达到3σ的重要性，并在参考DSNB模型10年后实现比5σ更好的效果。在没有观测的悲观情况下，Juno将大力改进限制，并排除模型参数空间的一个重要区域。
We present the detection potential for the diffuse supernova neutrino background (DSNB) at the Jiangmen Underground Neutrino Observatory (JUNO), using the inverse-beta-decay (IBD) detection channel on free protons. We employ the latest information on the DSNB flux predictions, and investigate in detail the background and its reduction for the DSNB search at JUNO. The atmospheric neutrino induced neutral current (NC) background turns out to be the most critical background, whose uncertainty is carefully evaluated from both the spread of model predictions and an envisaged in situ measurement. We also make a careful study on the background suppression with the pulse shape discrimination (PSD) and triple coincidence (TC) cuts. With latest DSNB signal predictions, more realistic background evaluation and PSD efficiency optimization, and additional TC cut, JUNO can reach the significance of 3σ for 3 years of data taking, and achieve better than 5σ after 10 years for a reference DSNB model. In the pessimistic scenario of non-observation, JUNO would strongly improve the limits and exclude a significant region of the model parameter space.