Bulletin of the American Physical Society
APS April Meeting 2017
Volume 62, Number 1
Saturday–Tuesday, January 28–31, 2017; Washington, DC
Session M11: Neutrino III |
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Sponsoring Units: DPF Chair: Kate Scholberg, Duke University Room: Roosevelt 3 |
Sunday, January 29, 2017 3:30PM - 3:42PM |
M11.00001: Recent CCQE results from MINERvA Anushree Ghosh The MINER$\nu$A detector situated in Fermilab, is designed to make precision cross section measurements for neutrino scattering processes on various nuclei. I will present the two most recent results from the MINER$\nu$A charged current quasi-elastic (CCQE) studies. The event sample for both analyses are the CCQE-like final state topology and contain contributions from quasi-elastic and inelastic processes where pions are absorbed in the nucleus. One of the analyses is the MINER$\nu$A experiment's first double-differential scattering cross sections for antineutrinos on the hydrocarbon target in the few-GeV range relevant to experiments such as DUNE and NOvA. We compare to models produced by different model generators, and are able to draw first conclusions about the predictions of these models. Another analysis, is the CCQE-like analysis for neutrinos on the nuclear targets of carbon, iron and lead. The ratio of differential cross sections on these targets to the differential cross section on the hydrocarbon target are examined to study nuclear effects. [Preview Abstract] |
Sunday, January 29, 2017 3:42PM - 3:54PM |
M11.00002: Sensitivity of IceCube-Gen2 Phase I to tau neutrino appearance Joao Pedro A. M. de Andre Looking towards the future of IceCube we are planning both high-energy and low-energy (PINGU) extensions. The first step towards these upgrade, "IceCube-Gen2 Phase I", consists of 7 additional strings inserted in the denser region DeepCore of the IceCube Neutrino Observatory. These additional photo-multipliers will more than double the number of sensors in the DeepCore region and with that significantly improve our ability to reconstruct low-energy events. This will lead to a significant improvement in the sensitivity to measure nutau appearance thanks to improved precision in reconstruction of nutau events. Also along with the additional photo-multipliers, new calibration devices will also be deployed with IceCube-Gen2 Phase I. These new devices will also further improve our understanding of the surrounding ice, and with that reduce the impact of some of our dominant systematics. The reduction of these systematics will also improve the sensitivity of IceCube to high-energy neutrinos through the re-analysis of the archival data with the improved detector systemtatics. We will present status of the tau neutrino appearance analysis using IceCube-Gen2 Phase I, both from thanks to the additional photomultiplier tubes deployed and from the extended calibration capabilities. [Preview Abstract] |
Sunday, January 29, 2017 3:54PM - 4:06PM |
M11.00003: Muon Neutrino Disappearance Measurement at MINOS+ Thomas Carroll The MINOS experiment ran from 2003 until 2012 and produced some of the best precision measurements of the atmospheric neutrino oscillation parameters $\Delta m^2_{32}$ and $\theta_{23}$ using muon neutrino disappearance of beam and atmospheric neutrinos and electron neutrino appearance of beam neutrinos. The MINOS+ experiment succeeded MINOS in September 2013. For almost three years MINOS+ collected data from the Medium Energy NuMI neutrino beam at Fermilab. Results of the muon neutrino disappearance analysis from the first two years of MINOS+ data will be presented. These results will be compared to and combined with the MINOS measurement. [Preview Abstract] |
Sunday, January 29, 2017 4:06PM - 4:18PM |
M11.00004: Search for Neutrino Emission from Fast Radio Bursts with IceCube Donglian Xu, Justin Vandenbroucke, Samuel Fahey, Ali Kheirandish Fast radio bursts (FRBs) typically last a few milliseconds, and are thought to be of extragalactic origin due to their large dispersion measures. Since the discovery of FRBs in 2007 by the Parkes radio telescope, a multitude of radio telescopes have observed a total of ~30 FRBs to date. Though there are various emerging models to explain such phenomena, the physics origin of FRBs is still a mystery. It is predicted that soft gamma-ray repeater (SGR) hyperflares could produce non-thermal millisecond radio outbursts from the relativistic magnetized explosions in the magnetospheres. With the volatility of strong magnetic fields, SGRs are also expected to be cosmic ray accelerators, which could produce TeV photons and neutrinos under the hadronic processes. We will present recent searches for coincident neutrinos with FRBs from IceCube. [Preview Abstract] |
Sunday, January 29, 2017 4:18PM - 4:30PM |
M11.00005: Noise Filtering and Signal Calibration in the MicroBooNE LArTPC Jyoti Joshi, Xin Qian In large liquid argon time projection chambers (LArTPCs), TPC signal processing, which recovers the number of ionized electrons arriving at anode wire planes from the raw digitized induction signals, is a crucial step towards automated event reconstruction. The first stage of signal processing is the identification and removal of any excess TPC noise with minimal impact on the true signal. In this talk, first I will describe the characterization and software filtering techniques of various TPC noise observed in the raw digital signal data in MicroBooNE. I will then describe a novel drifted-charge extraction method based on 2D deconvolution technique. These techniques significantly enhance the performance of the induction wire planes in MicroBooNE. [Preview Abstract] |
Sunday, January 29, 2017 4:30PM - 4:42PM |
M11.00006: NuMI Flux Predictions for NOvA and MINERvA Leonidas Aliaga Soplin The determination of the neutrino flux in any conventional neutrino beam presents a challenge for the current and future short and long baseline neutrino experiments. The uncertainties associated with the production and attenuation of the hadrons in the beamline materials along with those associated with the beam optics have a big effect in the knowledge of the flux. For experiments like MINERvA and NOvA, understanding the flux is crucial since it enters directly into every neutrino-nucleus cross-section measurement. The majority of this work involves predicting the neutrino flux using dedicated hadron production measurements from hadron-nucleus collisions. The predictions at the MINERvA and NOvA near detectors are presented as well as the results of incorporating in-situ MINERvA data that can provide additional constraints. These results have been fully implemented in MINERvA and they are currently use for its cross-section analysis. The implementation for NoVA is underway. The procedure and conclusions of this work will have a big impact on future hadron production experiments and on determining the flux for the upcoming DUNE experiment. [Preview Abstract] |
Sunday, January 29, 2017 4:42PM - 4:54PM |
M11.00007: Precise Measurements of Oscillation Parameters and Search for a Light Sterile Neutrino at Daya Bay Hin Lok Henoch Wong The Daya Bay Reactor Neutrino Experiment is designed to precisely measure the neutrino oscillation parameter $\theta_{13}$, via the relative comparison of antineutrino rates and energy spectra at different baselines. The experiment's unique configuration of multiple baselines from six 2.9 GW$_{th}$ nuclear reactors serving as intense ${\bar\nu}_{e}$ sources to eight functionally identical detectors deployed in two near (effective baselines $\sim$500 m and $\sim$600 m) and one far ($\sim$1600 m) underground experimental halls also makes it possible to look for oscillations with a fourth (sterile) neutrino in the $10^{-3} eV^{2}<|\Delta m^{2}_{41}|<0.3 eV^{2}$ range. In this talk, I will present Daya Bay's latest results. A three-flavor oscillation model analysis based on 1230 days of data has yielded the most precise determination of the flavour-mixing angle $sin^{2}2\theta_{13}$ and the neutrino mass-squared difference $\Delta m^{2}_{32}$. In addition, the search for a light sterile neutrino using 621 days of data did not show a significant preference towards a four-flavor oscillation model. The resulting limits on $sin^{2}2\theta_{14}$ constitute the world's best in most of the sub-eV mass region. [Preview Abstract] |
Sunday, January 29, 2017 4:54PM - 5:06PM |
M11.00008: The next generation neutrinoless double-beta decay experiment nEXO Ryan MacLellan The nEXO Collaboration is actively engaged in R\&D towards a very large detector for neutrinoless double beta decay of $^{136}$Xe. The nEXO detector is rooted in the current EXO-200 program, which has reached a sensitivity for the half-life of the decay of $1.9\times10^{25}$y with an exposure of 99.8 kg-y. The baseline nEXO design assumes 5 tonnes of liquid xenon, enriched in the mass 136 isotope, within a large monolithic time projection chamber. The initial goal for nEXO is a neutrinoless double-beta decay half-life sensitivity of $1\times10^{28}$y, covering the inverted neutrino mass hierarchy with 5 years of data. We present the conceptual nEXO detector design, the current status of R\&D efforts, and the physics case for the experiment. [Preview Abstract] |
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