Bulletin of the American Physical Society
2005 APS April Meeting
Saturday–Tuesday, April 16–19, 2005; Tampa, FL
Session C1: Neutrinos II |
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Sponsoring Units: DPF DAP Chair: Hitoshi Murayama, University of California-Berkeley Room: Marriott Tampa Waterside Grand Salon E |
Saturday, April 16, 2005 1:30PM - 2:06PM |
C1.00001: Neutrino mass constraints from cosmology Invited Speaker: Growth of structure in the universe depends sensitively on whether neutrinos have mass. As a result observations of large scale structure can probe total mass of all neutrino species. A combination of current cosmic microwave background anisotropy and large scale structure measurements provides neutrino mass limits that are already comparable or tighter than direct neutrino mass measurements. These constraints will be further improved in the near future. In combination with other neutrino experiments one can address the questions of neutrino mass degeneracy and existence of a fourth massive neutrino family. \newline \newline In collaboration with SDSS. [Preview Abstract] |
Saturday, April 16, 2005 2:06PM - 2:42PM |
C1.00002: Neutrino theory Invited Speaker: |
Saturday, April 16, 2005 2:42PM - 3:18PM |
C1.00003: First Results from the ANITA Experiment Invited Speaker: We present initial results of the 18 day long-duration balloon flight of the Antarctic Impulsive Transient Antenna (ANITA) prototype payload, dubbed ANITA-lite. The goal of the ANITA experiment is to detect cosmogenic ultra-high energy neutrinos, the so-called ``guaranteed'' flux arising from the integrated interactions of EeV-to-ZeV cosmic rays throughout the universe. ANITA exploits the power of coherent radio \v Cerenkov radiation emitted from the Askaryan excess charge in a high energy cascade. The exceptional radio-frequency (RF) transparency of Antarctic ice enables an antenna array on a balloon payload to monitor more than a million cubic kilometers of ice, giving unprecedented sensitivity to neutrino interactions in the EeV energy regime. ANITA-lite flew in early 2004 with a pair of prototype dual-polarization ANITA antennas, sensitive over the 0.2-1 GHz band, and able to trigger on impulsive events such as those expected from coherent RF cascade emission. ANITA-lite has demonstrated that RF backgrounds and electromagnetic interference for an Antarctic balloon payload are extremely low, and has verified the interferometric timing capabilities of the system, which are essential to event reconstruction and neutrino direction estimation. Limits on cosmogenic neutrino fluxes from analysis of the ANITA-lite data are presented, along with constraints on large extra dimensions and ultra-high energy neutralino fluxes. [Preview Abstract] |
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