12/10 ANITA極高能微中子實驗中所發現的反常事例

時間：12月 10日(四) 13：20

題目：ANITA極高能微中子實驗中所發現的反常事例
講者：劉宗哲 老師

服務單位：國立交通大學 電子物理學系

地點：本校基礎科學教學研究大樓1樓 110室

對象：本所博士生及碩士生、或其他有興趣之師生

摘要：

We report on an upward traveling, radio-detected cosmic-ray-like impulsive event with characteristics closely matching an extensive air shower. This event,
observed in the third flight of the Antarctic Impulsive Transient Antenna (ANITA), a NASA-sponsored long-duration balloon payload, is consistent with a similar event reported in a previous flight.
These events may be produced by the atmospheric decay of an upward-propagating τ-lepton produced by a ντ interaction, although their relatively steep arrival angles create tension with the standard model (SM) neutrino cross section.
Each of the two events have a posteriori background estimates of <∼ 10^{−2} events.
If these are generated by τ-lepton decay, then either the charged-current ντ cross section is suppressed at EeV energies, or the events arise at moments
when the peak flux of a transient neutrino source was much larger than the typical expected cosmogenic background neutrinos.

https://arxiv.org/pdf/1803.05088.pdf