ANITA- IV观测到的异常近地平线类Cosmic-ray事件
Unusual Near-horizon Cosmic-ray-like Events Observed by ANITA-IV
摘要：
ANITA在2016年底的第四次长时间气球飞行在$0.37^{+0.27}_{-0.17}$人为事件的背景下检测到29个宇宙射线（CR）样事件。CR主要出现在南极冰盖的反射中，产生了特征性的相位反转波形极性。然而，四个低于地平线的类CR事件显示出异常的非反转极性，一个$p = 5.3 \times 10^{-4}$的机会，如果由于背景。所有的异常事件都来自地平线附近的位置; ANITA-4没有观察到类似于之前飞行中看到的两个这样的事件的即将发生的异常事件。
英文摘要：
ANITA's fourth long-duration balloon flight in late 2016 detected 29 cosmic-ray (CR)-like events on a background of $0.37^{+0.27}_{-0.17}$ anthropogenic events. CRs are mainly seen in reflection off the Antarctic ice sheets, creating a characteristic phase-inverted waveform polarity. However, four of the below-horizon CR-like events show anomalous non-inverted polarity, a $p = 5.3 \times 10^{-4}$ chance if due to background. All anomalous events are from locations near the horizon; ANITA-IV observed no steeply-upcoming anomalous events similar to the two such events seen in prior flights.
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。
