Latest Results in the Search for Ultra-High Energy Neutrinos in the Askaryan Radio Array*

Ultra-high energy (>10 PeV) neutrinos encode unique information about the distant, high energy universe—including the composition of cosmic rays and the nature of astrophysical accelerators. The Askaryan Radio Array (ARA) is a gigaton telescope under construction at the South Pole to detect these rare particles (<1 km^3/year). By burying arrays of antennas 200 m in the Antarctic ice sheet, ARA seeks to observe neutrinos by measuring the broadband, radio impulse that accompanies neutrino-nucleon interactions in ice. Five stations have been deployed so far. In this talk, I will present the latest progress in our search for neutrinos in four years of data from two stations.