Bulletin of the American Physical Society
APS April Meeting 2014
Volume 59, Number 5
Saturday–Tuesday, April 5–8, 2014; Savannah, Georgia
Session E12: Neutrinos: New Results |
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Sponsoring Units: DPF Chair: Howard Haber, University of Califronia, Santa Cruz Room: 100 |
Saturday, April 5, 2014 3:30PM - 3:42PM |
E12.00001: Three flavour analysis of neutrino oscillations with MINOS, and sterile neutrinos in MINOS+ Ashley Timmons MINOS is a two-detector on-axis experiment based at Fermilab. The NuMI beam encounters the MINOS Near Detector 1 km downstream before travelling 734 km through the Earth's crust until the beam reaches the Far Detector located at the Soudan Underground Laboratory in Northern Minnesota. MINOS has analysed muon neutrino and antineutrino data from the NuMI beam looking at $\nu_{\mu}$ disappearance and $\nu_{\mu} \rightarrow \nu_{e}$ appearance. This complete set of MINOS data is combined with 37.88 kton years of atmospheric neutrino data. I will present results of this analysis, in a three-flavour framework, that makes the world's most precise measurement of $\Delta m^{2}_{23}$ and places new constraints on $\delta_{cp}$, the $\theta_{23}$ octant degeneracy and the mass hierarchy. I will also report on MINOS+: the recent energy and intensity upgrade of the NuMI beam and the plans to study it with the MINOS detectors. By looking at both charged current and neutral current interactions in this region of L/E MINOS+ will look for beyond the Standard Model physics such as sterile neutrinos. [Preview Abstract] |
Saturday, April 5, 2014 3:42PM - 3:54PM |
E12.00002: Selection of neutral current antineutrino events at the MINOS Near Detector to search for sterile neutrinos Navaneeth Poonthottathil The MINOS experiment measures neutrino oscillation phenomena using two detectors separated by 734 km and a neutrino beam produced by the Fermilab Main Injector. MINOS has previously searched for active to sterile neutrino mixing $(\nu_{\mu} \rightarrow \nu_{s})$ using muon neutrinos and has set limit on this process. We are now conducting a search for the muon anti-neutrino to sterile neutrino transition using the NuMI beam optimized for $\overline{\nu}_{\mu}$ production.Since the rates of neutral current interactions on both detectors are unchanged by standard oscillations , any depletion of the Far Detector neutral current event rate can be a signature of active to sterile neutrino transition. The precise measurement of the anti-neutrino neutral current rate at the Near Detector is important for this study. In this talk I will discuss how MINOS identifies neutral current events and rejects charged current events, and the technique of reducing the number of poorly reconstructed events at the lower energy range. [Preview Abstract] |
Saturday, April 5, 2014 3:54PM - 4:06PM |
E12.00003: Constraining Large Extra Dimensions with MINOS/MINOS+ Junting Huang We present the sensitivity of MINOS/MINOS+ to large extra dimensions using muon neutrino disappearance in the NuMI beam. Employing a model in which sterile neutrinos can propagate in a large compactified extra dimension while standard model left-handed neutrinos are confined to a 4-dimensional brane, we constrain the size of large extra dimensions as a function of the lightest neutrino mass. Mixing between active and sterile neutrinos occurring in the MINOS/MINOS+ baseline are treated as perturbations to the standard oscillation scenario. [Preview Abstract] |
Saturday, April 5, 2014 4:06PM - 4:18PM |
E12.00004: Low-$\nu$ Flux and Total Charged-current Cross Sections in MINERvA Lu Ren The MINER$\nu$A experiment measures neutrino and antineutrino interaction cross sections on carbon and other nuclei. Cross section measurements require accurate knowledge of the incident neutrino flux. The ``low-$\nu$'' flux technique uses a standard-candle cross section for events with low energy transfer to to the hadronic system to determine the incident flux. MINER$\nu$A will use low-$\nu$ fluxes for neutrinos and antineutrinos to tune production models used in beam simulations and to extract total cross sections as a function of energy. We present the low-$\nu$ flux technique adapted for the MINER$\nu$A data samples and preliminary results for the extracted low-$\nu$ fluxes in MINER$\nu$A. MINER$\nu$A will extend the range of antineutino charged-current cross section measurements to lower energies which are of interest to future accelerator oscillation experiments. [Preview Abstract] |
Saturday, April 5, 2014 4:18PM - 4:30PM |
E12.00005: Neutrino Charged Current Quasi-Elastic Analysis at MINERvA Kenyi Hurtado Anampa, Jyotsna Osta MINERvA is a few GeV neutrino-nucleus scattering experiment designed to study low energy neutrino interactions both in support of neutrino oscillation experiments and as a pure weak probe of the nuclear medium. The experiment uses a fine-grained, high resolution detector. The active region is composed of plastic scintillator with additional targets of helium, carbon, iron, lead and water placed upstream of the active region. We present kinematic distributions from the double differential cross section analysis that aims to study quasi-elastic scattering of neutrinos in the active region as a function of the muon and proton observables. This analysis will use the low energy neutrino dataset recorded from November 2009 to April 2012. [Preview Abstract] |
Saturday, April 5, 2014 4:30PM - 4:42PM |
E12.00006: Analysis Techniques to Measure Charged Current Inclusive Water Cross Section and to Constrain Neutrino Oscillation Parameters using the Near Detector (ND280) of the T2K Experiment Rajarshi Das The Tokai to Kamioka (T2K) Experiment is a long-baseline neutrino oscillation experiment located in Japan with the primary goal to precisely measure multiple neutrino flavor oscillation parameters. An off-axis muon neutrino beam with an energy that peaks at 600 MeV is generated at the JPARC facility and directed towards the kiloton Super-Kamiokande (SK) water Cherenkov detector located 295 km away. The rates of electron neutrino and muon neutrino interactions are measured at SK and compared with expected model values. This yields a measurement of the neutrino oscillation parameters sinq and sinq. Measurements from a Near Detector that is 280 m downstream of the neutrino beam target are used to constrain uncertainties in the beam flux prediction and neutrino interaction rates. We present a measurement of inclusive charged current neutrino interactions on water. We used several sub-detectors in the ND280 complex, including a Pi-Zero detector (P0D) that has alternating planes of plastic scintillator and water bag layers, a time projection chamber (TPC) and fine-grained detector (FGD) to detect and reconstruct muons from neutrino charged current events. Finally, we describe a ``forward-fitting'' technique that is used to constrain the beam flux and cross section as an input for the neutrino oscillation analysis and also to extract a flux-averaged inclusive charged current cross section on water. [Preview Abstract] |
Saturday, April 5, 2014 4:42PM - 4:54PM |
E12.00007: ABSTRACT WITHDRAWN |
Saturday, April 5, 2014 4:54PM - 5:06PM |
E12.00008: QE and Non-QE muon neutrino events in the NO$\nu$A prototype detector Enrique Arrieta Diaz The NO$\nu$A long$-$baseline neutrino experiment will search for oscillations of muon neutrinos to electron neutrinos. In order to test the various systems of the experiment, the collaboration built a prototype Near Detector On the Surface (NDOS), at Fermilab, $6^{\circ}$ off the NuMI beam axis. NDOS collected data that are being analyzed in order to get a better understanding on the production of muon neutrinos coming from Kaon decays, by studying the charged current interaction events. As part of this analysis two sets of events where identified: QE and Non$-$QE events. I will present the selection criteria for these sets, as well as sample events for each set, in order to show the detection capabilities of the detector for charged current interactions. [Preview Abstract] |
Saturday, April 5, 2014 5:06PM - 5:18PM |
E12.00009: Search for sterile neutrino mixing at Daya Bay Yasuhiro Nakajima The Daya Bay Reactor Neutrino Experiment is designed to measure the neutrino mixing angle $\theta_{13}$ with unprecedented precision. The experiment detects antineutrinos from Daya Bay reactor complex with eight functionally identical Antineutrino Detectors, which are distributed among three experimental halls. We started data taking in December 2011, and have collected more than one million reactor antineutrino interactions. This high-statistics of data allow us not only to make precise measurement of oscillation parameters, but also to search for new physical phenomena beyond the standard model such as sterile neutrino mixing. We have made the most precise measurements of $\sin^22\theta_{13}$ and the first direct measurement of the effective mass splitting, $\Delta m^2_{ee}$, from relative comparisons of antineutrino rate and spectra. A signature of sterile neutrino mixing would appear as an additional spectral distortion of a different frequency. In this talk, I will report the current status of our sterile neutrino search as well as oscillation parameter measurements. [Preview Abstract] |
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