Search for Cosmic Ultra-High Energy Neutrinos with ANITA-IV
Abstract
The ANtarctic Impulsive Transient Antenna (ANITA) is a balloon-borne experiment designed to detect radio pulses at approximately 37 km above the Antarctic ice sheet. Using antennas with both horizontal and vertical polarization channels measuring within a frequency range of 180-1200 MHz, the radio pulses detected are expected to correspond to emission from cosmic ray extended air showers in the horizontal polarization channel and in the vertical polarization channel from particle showers produced by in-ice neutrino interactions. This talk will discuss the techniques employed in analyzing the data collected from the December 2016 ANITA-IV flight, as well as recently published findings of the ANITA collaboration regarding the December 2014 ANITA-III flight. During the ANITA-III flight an event consistent with an upcoming ultra-high energy cosmic-ray (UHECR) was detected, but at a steep upcoming angle inconsistent with direct detection from stratospheric air showers, and with a waveform polarity inconsistent with reflected detection off of the ice. One other such event was detected during the ANITA-I flight. It has been proposed that these events may correspond to atmospheric decay of upward-propagating τ-leptons produced by an in-ice ντ interaction. However, this interpretation leads to contention with the standard model (SM) neutrino cross section.
- Publication:
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American Astronomical Society Meeting Abstracts #233
- Pub Date:
- January 2019
- Bibcode:
- 2019AAS...23321508R