Bulletin of the American Physical Society
APS April Meeting 2010
Volume 55, Number 1
Saturday–Tuesday, February 13–16, 2010; Washington, DC
Session H13: High Energy Neutrino Detection and Properties |
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Sponsoring Units: DAP Chair: Kara Hoffman, University of Maryland Room: Washington 6 |
Sunday, February 14, 2010 10:45AM - 10:57AM |
H13.00001: Observation of UHE Cosmic Rays from a Balloon-borne Neutrino Telescope Stephen Hoover The ANtarctic Impulsive Transient Antenna (ANITA) is a balloon-borne array of radio antennas designed to detect coherent radio Cherenkov radiation from ultra-high energy (UHE) neutrino-induced particle showers in the Antarctic ice sheet. The first flight of ANITA has produced limits on the UHE neutrino flux, and analysis of data from the second flight is underway. I will describe the neutrino search in ANITA-1 data and concurrent observations of geosynchrotron radio emissions from UHE cosmic ray extensive air showers. [Preview Abstract] |
Sunday, February 14, 2010 10:57AM - 11:09AM |
H13.00002: The Nature of Horizontally Polarized Events in ANITA 1: MC Simulations Eric Grashorn The ANITA (ANtarctic Impulsive Transient Antenna) experiment is a balloon-borne, broadband antenna array flown over the Antarctic continent. It is designed to detect radio Cherenkov emission from UHE astrophysical neutrinos (E $>10^{18}$) interactions in the ice below. ANITA 1 completed a 35 day flight during the Austral summer of 2006-2007, observing a number of horizontally polarized events, which could be caused by radio emission from downward going cosmic rays reflecting off the ice. A detailed simulation was written to calculate ANITA's sensitivity to reflected cosmic ray radio signals. [Preview Abstract] |
Sunday, February 14, 2010 11:09AM - 11:21AM |
H13.00003: The Search for Ultra High-Energy Neutrinos With The ANITA Experiment Abigail Goodhue Vieregg The ANITA (ANtarctic Impulsive Transient Antenna) experiment is an innovative balloon-borne radio telescope, designed to detect coherent Cherenkov emission from cosmogenic ultra high-energy neutrinos with energy greater than $10^{18}$ eV. The second flight of the ANITA experiment launched on 21 December 2008, and collected data for 30 days. This large data set allows for the most sensitive investigation into the exciting GZK (Greisin-Zatsepin-Kuzmin) neutrino flux regime to date. I will present the status of the first pass analysis of the ANITA-II data set including calibration, analysis methods, and background rejection techniques. [Preview Abstract] |
Sunday, February 14, 2010 11:21AM - 11:33AM |
H13.00004: The Sensitivity of the ANITA Experiment to Magnetic Monopoles Miles Detrixhe The ANITA (Antarctic Impulsive Transient Antenna) experiment is a balloon-borne antenna array designed to detect Cherenkov radiation produced by ultra-high energy neutrino interactions with the Antarctic ice. Magnetic monopoles are hypothetical particles that also produce Cherenkov radiation in the radio regime. The first ANITA flight in 2006-07 illustrated the extreme sensitivity of ANITA to relativistic magnetic monopoles. The second flight (2008-09) flew with much more live time. I will discuss the potential ANITA's second flight has for detecting ultra-relativistic magnetic monopoles and a method for doing so. [Preview Abstract] |
Sunday, February 14, 2010 11:33AM - 11:45AM |
H13.00005: Upper limit on the diffuse flux of UHE tau neutrinos Claudia Fracchiolla The Pierre Auger Observatory is a cosmic ray hybrid detector located in the province of Mendoza in Argentina. Due to its design characteristics it allows us to study fundamental particle interactions at energies well beyond those available at colliders. The Auger Observatory is not only sensitive to high energy cosmic rays, but also to ultra-high energy neutrinos with energies above 10$^{18}$ eV (1EeV). Neutrinos are the perfect messengers from out of space, neutrally charged and interact only weakly, they can travel long distances without interacting. Therefore they can provide us information that other particles, especially charged particles, are not able to. In this talk I will present the evaluation of the sensitivity of Auger to the so-called ``Earth-skimming" events, the procedure to discrimine them from background, and the upper limit on the diffuse flux of tau neutrinos obtained at EeV energies from Auger data. [Preview Abstract] |
Sunday, February 14, 2010 11:45AM - 11:57AM |
H13.00006: The Extreme Universe Space Observatory on the Japanese Experiment Module (JEM-EUSO) Yoshiyuki Takahashi, Mark Christl The JEM-ESUO mission will explore the nature and physical processes of the highest energy particles. This international mission will be carried out aboard the ISS looking down on Earth's dark sky to observe the extensive air showers produced through the interaction of extreme high energy particles in the atmosphere. The science program and technical advances in the instrument design continue to evolve. An update of the mission status will be presented. [Preview Abstract] |
Sunday, February 14, 2010 11:57AM - 12:09PM |
H13.00007: Probing Dark Matter with Neutrinos Ina Sarcevic We evaluate the neutrino and muon flux from annihilation of the dark matter in the core of the Sun, in the core of the Earth, from the Galactic Center and from cosmic diffuse neutrinos produced in dark matter annihilation in the halos. We consider model-independent direct neutrino production and secondary neutrino production from the decay of taus produced in the annihilation of dark matter.We illustrate how muon energy distribution from dark matter annihilation has a very different shape than muon flux from atmospheric neutrinos.We consider both the upward muon flux, when muons are created in the rock below the detector, and the contained flux when muons are created in the (ice) detector. We comment on neutrino flavor dependence and their detection. [Preview Abstract] |
Sunday, February 14, 2010 12:09PM - 12:21PM |
H13.00008: Neutrinos in Hot and Dense Media Samina Masood We reinvestigate the modifications in the properties of neutrinos in hot and dense media. The change in properties depends on the type of neutrinos. Massless neutrinos of the standard model acquire Dirac type of temperature and density dependent selfmass in hot and dense media. Dirac neutrinos exhibit the refractive energy and higher value of the magnetic moment in hot and dense media. The transition magnetic moment of Majorana neutrino is modified differently in hot and dense media. We compare all these changes in detail. [Preview Abstract] |
Sunday, February 14, 2010 12:21PM - 12:33PM |
H13.00009: Search Capability for $\eta \to \nu_{e,{\tau}}\bar\nu_{e,{\tau}}$ Decays in Cubic Kilometer Neutrino Detectors Ali Fazely, Rathnayaka Gunasingha, Richard Imlay, Samvel Ter-Antonyan, Xianwu Xu We investigate the discovery potential of cubic kilometer neutrino observatories such as IceCube to set stringent limits on the forbidden decays $\eta \to \nu_e\bar\nu_e$ and $\eta \to \nu_{\tau}\bar\nu_{\tau}$. The signatures for these decays are cascade events resulting from the charged-current reactions of $\nu_e, \nu_{\tau}$, $\bar\nu_e$ and $\bar\nu_{\tau}$ on nuclei in such detectors. Background cascade events are mainly due to $\nu_e$'s from atmospheric $\mu$, $K^+$, and $K^{0}_S$ decays and to a lesser extent from atmospheric $\nu_{\mu}$ neutral current interactions with nuclei. A direct upper limit for the branching ratio $\eta \to \nu_{e,\tau} \bar\nu_{e,\tau}$ of $5.0 \times10^{-4}$ at 90\% CL can be achieved. [Preview Abstract] |
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