6 research outputs found

    Observational Search for PeV-EeV Tau Neutrino from GRB081203A

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    We report the first observational search for tau neutrinos from gamma ray bursts (GRBs) using one of the Ashra light collectors. The earth-skimming tau-neutrino technique of imaging Cherenkov tau showers was applied as a detection method. We set stringent upper limits on the tau-neutrino fluence in PeV-EeV region for 3780 s (between 2.83 and 1.78 hours before) and another 3780 s (between 21.2 and 22.2 hours after) surrounding GRB081203A triggered by the Swift satellite. This first search for PeV-EeV tau neutrino complements other experiments in energy range and methodology, and suggests the prologue of "multi-particle astronomy" with a precise determination of time and location.Comment: 13 pages, 4 figure

    Particle Physics in ASHRA

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    Abstract Here we consider detectability of high-energy ν τ whose energy is larger than 10 16 eV by All-sky Survey High Resolution Air-shower telescope project (ASHRA). Furthermore, we discuss impacts on particle physics and astrophysics to detect such high-energy neutrinos. Observation of high energy ν τ We have never observed a high-energy neutrino whose energy is larger than 10 16 eV. Detecting such high-energy neutrinos has following four important implications [1]. 1. We can explore the frontiers of particle physics, e.g., the effects by the extra dimensions. 2. We can obtain informations about the source of the high-energy cosmic rays, even if it is optically thick, and we cannot observe it. 3. Comparing the composition of high-energy cosmic rays, i.e., gamma-rays, nuclei and neutrinos, we can obtain informations about the mechanism of the acceleration
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