Bulletin of the American Physical Society
APS April Meeting 2015
Volume 60, Number 4
Saturday–Tuesday, April 11–14, 2015; Baltimore, Maryland
Session B7: Neutrino Oscillations |
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Sponsoring Units: DPF DNP Chair: Ke Han, Yale University Room: Key 3 |
Saturday, April 11, 2015 10:45AM - 10:57AM |
B7.00001: The NOvA Electron Neutrino Appearance Analysis Evan Niner NOvA is a long-baseline neutrino oscillation experiment that uses two functionally identical detectors 810 kilometers apart and located 14 milliradians off-axis from the NuMI beamline at Fermilab. The experiment studies oscillations of the muon neutrino and anti-neutrino beam that is produced. Both detectors completed commissioning in the summer of 2014 and are collecting data. One of the primary physics goals of the experiment is to study the appearance of electron neutrinos and anti-neutrinos after oscillations of the beam which will lead to measurements of $\sin^{2}2\theta_{13}$, $\delta$ and the mass hierarchy. This talk will present the cosmic ray background rejection, show latest near detector data, and discuss the analysis strategies and techniques developed for the electron neutrino analysis. [Preview Abstract] |
Saturday, April 11, 2015 10:57AM - 11:09AM |
B7.00002: Status of the NO$\nu$A Near Detector and its role in $\nu_{\mu}$ Analysis Jose Sepulveda-Quiro NO$\nu$A is a second generation long-baseline (810 km) neutrino oscillation experiment, currently taking data, designed to address the important open questions in the neutrino sector through precision measurements of $\nu_{e}/ \overline{\nu}_{e}$ appearance and $\nu_{\mu}/ \overline{\nu}_{\mu}$ disappearance. It uses an upgraded neutrino beam from Fermilab and two highly active, segmented, liquid scintillator off-axis detectors that offer a remarkable capability in event identification. One of the main purposes of the 293 ton Near Detector at Fermilab is to investigate the unoscillated beam composition by measuring the neutrino event rate, which can be used to predict the neutrino energy spectrum at the 14 kton Far Detector at Ash River, MN. In this talk, a review of the Near Detector commissioning effort and its performance focused on the $\nu_{\mu}$ disappearance measurement will be discussed. [Preview Abstract] |
Saturday, April 11, 2015 11:09AM - 11:21AM |
B7.00003: Status and Future Sensitivities from the $\nu_{\mu}$ Disappearance Analysis in the NOvA Experiment Michael Baird The NOvA experiment is a long-baseline neutrino oscillation experiment based out of Fermilab. It uses the newly upgraded NuMI beam line with two liquid scintillator detectors, one at Fermilab and a second 14 kton detector in northern Minnesota. The $\nu_{\mu}$ disappearance analysis can significantly improve the world's best measurement of $sin^{2}(2\theta_{23})$. Presented here is the status of this analysis as well as future sensitivities. [Preview Abstract] |
Saturday, April 11, 2015 11:21AM - 11:33AM |
B7.00004: Measurement of Muon Neutrino Disappearance with IceCube/DeepCore Matt Dunkman New event reconstruction techniques have resulted in a high statistics atmospheric neutrino sample from the first three years of data from the complete IceCube Neutrino Observatory. The more densely instrumented DeepCore sub-array, with an energy threshold around 10 GeV, is very sensitive to the first atmospheric oscillation minima. I will present the current constraints on oscillation parameters $\theta_{23}$ and $\Delta m_{32}$ from IceCube. [Preview Abstract] |
Saturday, April 11, 2015 11:33AM - 11:45AM |
B7.00005: Muon Neutrino Disappearance Measurements at MINOS+ Will Flanagan Starting in September 2013, the MINOS+ collaboration has been collecting data from the Medium Energy NuMI neutrino beam at Fermilab. MINOS+ is currently scheduled to operate for three years, and will improve upon the world-leading measurements of neutrino oscillations using muon neutrino disappearance made by the MINOS experiment, yielding precision measurements of the oscillation parameters $\sin^2\theta_{23}$ and $\Delta m^2_{32}$. This talk will present results from MINOS+ based on the first year of data. An overview of the analysis, a comparison to previous MINOS results, and future sensitivities using the projected MINOS+ dataset will be presented. [Preview Abstract] |
Saturday, April 11, 2015 11:45AM - 11:57AM |
B7.00006: T2K far detector event reduction, reconstruction and selection Xiaoyue Li T2K is a long baseline neutrino experiment designed for observation of neutrino oscillations and measurement of cross sections. An intense muon neutrino beam generated at the J-PARC facility is directed to the far detector Super-Kamiokande (Super-K) 295 km away. T2K beam events detected in Super-K can be separated from Super-K non-beam events using precision timing. Further data reduction procedures guarantee the high quality of T2K data and classify events into different categories. Super-K is a 50 kiloton water Cherenkov detector. Events at Super-K are reconstructed based on the PMT charge and timing information from observed Cherenkov radiation generated by relativistic charged particles. In particular, electron-like and muon-like events have different patterns, which allows for particle identification. Event selections are applied to obtain electron-like and muon-like subsamples for T2K oscillation analyses. This talk will review the event reduction, reconstruction and selection of T2K far detector. [Preview Abstract] |
Saturday, April 11, 2015 11:57AM - 12:09PM |
B7.00007: Inelastic Single Pion Signal Study in T2K $\nu_e$ Appearance using Modified Decay Electron Cut Konosuke Iwamoto The T2K long-baseline neutrino experiment uses sophisticated selection criteria to identify the neutrino oscillation signals among the events reconstructed in the Super-Kamiokande (SK) detector for $\nu_e$ and $\nu_\mu$ appearance and disappearance analyses. In current analyses, charged-current quasi-elastic (CCQE) events are used as the signal reaction in the SK detector because the energy can be precisely reconstructed. This talk presents an approach to increase the statistics of the oscillation analysis by including non-CCQE events with one Michel electron and reconstruct them as the inelastic single pion productions. The increase in statistics, backgrounds to this new process and energy reconstruction implications will be presented with this increased event sample. [Preview Abstract] |
Saturday, April 11, 2015 12:09PM - 12:21PM |
B7.00008: CHIPS Neutrino Detector Research and Development Ramon Salazar, Patricia Vahle The CHIPS R\&D project is an effort to develop affordable megaton-scale neutrino detectors. The CHIPS strategy calls for submerging water Cherenkov detectors deep under water. The surrounding water acts as structural support, minimizing large initial investments in costly infrastructure, and serves as an overburden, shielding the detector from cosmic rays and eliminating the need for expensive underground construction. Additional cost savings will be achieved through photodetector development and optimization of readout geometry. In summer 2014 a small prototype of the CHIPS detector was deployed in the flooded Wentworth Mine Pit in Northern Minnesota. The detector has been recording data underwater throughout the fall and winter. In this talk, we will discuss lessons learned from the prototyping experience and the plans for submerging much larger detectors in future years. [Preview Abstract] |
Saturday, April 11, 2015 12:21PM - 12:33PM |
B7.00009: An Experimental Program in Neutrinos, Nucleon Decay and Astroparticle Physics Enabled by the Fermilab Long-Baseline Neutrino Facility Milind Diwan A Letter of Intent has been submitted by a new International Team to pursue an accelerator-based long-baseline neutrino experiment, as well as neutrino astrophysics and nucleon decay, with an approximately 40-kt (fiducial) modular liquid argon TPC (LAr-TPC) detector located deep underground and a high-resolution near detector. Several independent worldwide efforts, developed through years of detailed studies, are converging around the opportunity provided by the megawatt neutrino beam facility planned at Fermilab and by the new significant expansion with improved access at the Sanford Underground Research Facility in South Dakota, 1,300 km from Fermilab. The principle goals of this experiment are: a comprehensive investigation of neutrino oscillations to test CP violation in the lepton sector, determine the ordering of the neutrino masses, and test the three-neutrino paradigm; to perform a broad set of neutrino scattering measurements with the near detector; and to exploit the large, high-resolution, underground far detector for non-accelerator physics topics including atmospheric neutrino measurements, searches for nucleon decay, and measurement of astrophysical neutrinos especially those from a core-collapse supernova. [Preview Abstract] |
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