Recent Results from ANITA

TL;DR

The ANITA experiment's recent results include setting new limits on ultra-high-energy neutrino flux and detecting extensive air shower candidates, including an unusual upward-going event, advancing understanding of high-energy cosmic phenomena.

Contribution

This paper reports the latest findings from ANITA's third flight, including the most sensitive neutrino flux limits and detection of air shower candidates, highlighting new potential upward-going air shower events.

Findings

One neutrino candidate detected with low background estimate.

Set the best limits on diffuse neutrino flux above 10^19.5 eV.

Identified nearly 30 extensive air shower candidates, including an unusual upward-going event.

Abstract

The ANtarctic Impulsive Transient Antenna (ANITA) long-duration balloon payload searches for Askaryan radio emission from ultra-high-energy ($>10^{18}$ eV) neutrinos interacting in Antarctic ice. ANITA is also sensitive to geomagnetic radio emission from extensive air showers (EAS). This talk summarizes recently released results from the third flight of ANITA, which flew during the 2014-2015 Austral summer. The most sensitive search from ANITA-III identified one neutrino candidate with an a priori background estimate of 0.7$^{+0.5}_{-0.3}$. When combined with previous flights, ANITA sets the best limits on diffuse neutrino flux at energies above $\sim10^{19.5}$ eV. Additionally, ANITA-III searches identified nearly 30 EAS candidates. One unusual event appears to correspond to an upward-going air shower, similar to an event from ANITA-I.