Cascade-based Search for Tau Neutrinos in IceCube Data

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The recently completed IceCube neutrino observatory, located near the geographic South Pole, is collecting physics data in the largest instrumented volume of any neutrino detector. The complete IceCube detector instruments a full cubic kilometer of ice, including a densely spaced "DeepCore" component at the center of the detector. IceCube has the greatest sensitivity of any detector to astrophysical neutrinos at TeV - PeV energies. DeepCore extends IceCube's range to energies near 10 GeV where IceCube's large sample of atmospheric neutrinos is complementary to existing long baseline accelerator neutrino experiments. The next three years will see the exploitation of the full dataset of IceCube, with rich possibilities for neutrino physics and astrophysics.This award continues support for the IceCube analysis group at the University of Alabama (UA) to explore cascade-based neutrino searches in the tau neutrino channel. At high energies, the tau channel is free of atmospheric neutrino background, making tau neutrino detection a "smoking gun" for an astrophysical source. The UA group will focus on combining the superior energy resolution of cascades with the unique waveforms and improved direction resolution of tau neutrinos. DeepCore will enhance the search for astrophysical tau neutrinos at energies down to 100 TeV where fluxes are expected to be higher and neutrinos can be observed from both hemispheres of the sky. At low energies around 25 GeV, where the tau neutrino appearance probability from atmospheric neutrino oscillation is maximal, the UA group will improve the directional and energy resolution of cascade reconstruction algorithms in order to search for the appearance of tau neutrino cascades in DeepCore.Broader Impact: The University of Alabama is located in the diverse community of Tuscaloosa, and the university has a strong commitment to undergraduate and interdisciplinary research. The PI has developed an activity for high school students based on diffusion cloud chambers and has presented this activity to local physics and chemistry high school teachers through the UA Science in Motion Program. The PIs will continue to work with ASIM to bring high energy physics activities to the high school classroom. The UA Department of Physics and Astronomy has a strong public outreach program, and the PIs will continue public outreach activities at the UA campuses in Tuscaloosa and Birmingham.