Bulletin of the American Physical Society
APS April Meeting 2011
Volume 56, Number 4
Saturday–Tuesday, April 30–May 3 2011; Anaheim, California
Session R7: Neutrinos I |
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Sponsoring Units: DNP Chair: Jelena Maricic, Drexel University Room: Grand E |
Monday, May 2, 2011 1:30PM - 1:42PM |
R7.00001: Measuring Nuclear Effects with MINERvA G. Arturo Fiorentini MINER$\nu$A (Main INjector Experiment for $\nu$-A) is a neutrino scattering experiment in the 1-10 GeV energy range in the NuMI high-intensity neutrino beam at the Fermi National Accelerator Laboratory. MINER$\nu$A is now taking data and it was designed to measure neutrino-nucleus cross sections on a variety of different materials (C, Fe, Pb, He, H2O) allowing the study of nuclear effects and the A- dependence in neutrino interactions. This talk will present the current status in the analysis of inclusive charge current events in the iron, lead, and plastic targets. [Preview Abstract] |
Monday, May 2, 2011 1:42PM - 1:54PM |
R7.00002: A three-flavor oscillation analysis of a new KamLAND data set Thomas O'Donnell KamLAND is a one kilo-ton liquid scintillator anti-neutrino detector which studies reactor-$\bar{\nu}_{e}s$ with an average baseline of $\sim 180\,\rm{km}$. The experiment was the first to report reactor-$\bar{\nu}_{e}$ disappearance and distortion of the $\bar{\nu}_{e}$ spectrum -- the fingerprint of mass-driven flavor oscillation -- and is uniquely sensitive to the mixing parameter $\Delta m^{2}_{21}$ . I will present the results of a three-flavor oscillation analysis based on the most recent data set which amounts to a total exposure of $3.49 \times 10^{32}$ proton-years and includes data collected with more favorable background conditions achieved by a detector radio-purity upgrade. Finally the results of a global analysis including reactor, solar, atmospheric and long-baseline accelerator oscillation data and the emerging weak constraints on $\theta_{13}$ will be presented. [Preview Abstract] |
Monday, May 2, 2011 1:54PM - 2:06PM |
R7.00003: Study of ${\Lambda}^{0}$ polarization in $ {\nu}_{\mu} N \longrightarrow {\Lambda}^{0}{\mu}^{-}X$ at Low Energies M. Cristiana Zarazua, Julian Felix In MINERvA Experiment (FNAL e938), we study ${\Lambda}^{0}$ polarization in neutrino-nucleon reactions ${\nu}_{\mu} N \longrightarrow {\Lambda}^{0}{\mu}^{-}X$ produced at low energies (1 -4.5 GeV). We present in this work the criteria to identify and select possible ${\Lambda}^{0}$ events, the methodology to study ${\Lambda}^{0}$ polarization, and some preliminary results. [Preview Abstract] |
Monday, May 2, 2011 2:06PM - 2:18PM |
R7.00004: Weak Pion and Photon Production from Nuclei in a Chiral Effective Field Theory (Update) Xilin Zhang, Brian D. Serot Neutrino-induced pion and photon production from nucleons and nuclei are important for the interpretation of neutrino-oscillation experiments. [A. A. Aquilar-Arevalo \textit{et al.} (MiniBooNE Collaboration), Phys.\ Rev.\ Lett.\ {\bf 100}, 032301 (2008)]. We have been working on these problems in a Lorentz-covariant effective field theory (known as QHD EFT), which contains nucleons, pions, Deltas ($\Delta$), isoscalar scalar ($\sigma$) and vector ($\omega$) fields, and isovector vector ($\rho$) fields and has nonlinear chiral symmetry built in. Here we update our results on weak pion and photon production from nuclei, including both incoherent and coherent scattering. Connections between our results and the background analysis from MiniBooNE will be presented. In particular, coherent production of photons will be emphasized, and the possible relevance to the low-energy excess events at MiniBooNE will be explored. To justify our approximation scheme, we compare our results with data for inclusive electron scattering off nuclei up to the $\Delta$ peak and with coherent photoproduction of pions. Finally, we focus on the approximation scheme used and discuss the important $\Delta$ dynamics in the medium. An interesting mechanism to generate the $\Delta$'s spin-orbit coupling in the nucleus will be introduced, together with its possible consequences. [Preview Abstract] |
Monday, May 2, 2011 2:18PM - 2:30PM |
R7.00005: The MINER$\nu$A Test Beam Study Julian Felix The MINER$\nu$A Detector (http://minerva.fnal.gov) (Main INjector ExpeRiment$\nu$A) is a high statistics experiment in a NuMI beamline at Fermilab. Its main goals are to measure the interactions neutrino (antineutrino)-Nucleus at low energies in order to improve neutrino oscillation studies and study the dynamics between neutrinos (antineutrino) and nucleons within nuclei. The detector is installed and collecting data. For calibration, the MINER$\nu$A collaboration created the MINER$\nu$A Test Beam experiment. This was designed, constructed and commissioned successfully. In Summer of 2010, it finished its first data run; analyses are in progress. This talk will report on the data that was taken and the suite of analyses that are underway. [Preview Abstract] |
Monday, May 2, 2011 2:30PM - 2:42PM |
R7.00006: Daya Bay Calibration System Raymond Hei-man Tsang $\theta_{13}$ is the last unknown mixing angle in the neutrino mixing matrix. Knowledge of $\theta_{13}$ is essential for understanding the phenomenon of neutrino oscillations and CP-violation in lepton sector. Through observing the disappearance of reactor antineutrinos, the Daya Bay Reactor Neutrino Experiment aims at probing $sin^2 2 \theta_{13}$ with a sensitivity of 0.01 at 90\% C.L. in 3 years of running. To reach such a sensitivity, we need to understand the performance of our detectors using various methods, including the use of radioactive sources and LEDs manipulated by automatic calibration units. In this talk, the calibration system will be introduced. [Preview Abstract] |
Monday, May 2, 2011 2:42PM - 2:54PM |
R7.00007: What we know about neutrino mixing angles and mass-squared differences David Ernst, Jesus Escamilla-Roa, David Latimer, Bernadette Cogswell Results of an analysis of the pertinent world's neutrino oscillation data, in the context of three neutrinos, will be presented. The analysis includes the most recent Super-K atmospheric data, all solar data sets, the long-baseline MINOS survival and oscillation data, the KamLand reactor data, the CHOOZ reactor data, and any data released in sufficient time for an analysis to be performed. Exact oscillation probabilities that include all linear and higher order terms in $\theta_{13}$ are used . We will focus on our knowledge of $\theta_{13}$ including its sign, the implications of this data for deciding the correct mass hierarchy, and any indications, if any, in the present data for CP violation. Thoughts on the significance of future but near-term experiments will be put forth. [Preview Abstract] |
Monday, May 2, 2011 2:54PM - 3:06PM |
R7.00008: Anti-Neutrino Quasi-Elastic Scattering in MINERvA Jesse Chvojka We present recent measurements of anti-neutrino quasi-elastic scattering (nubar{\_}mu+p-$>$mu+n) at energies of a few GeV which is an important interaction channel and energy range for measuring leptonic CP violation with neutrino oscillation. The interactions were observed in the NuMI beam at Fermilab by the MINERvA detector. We discuss sample selection and reconstruction techniques and show data and simulation comparisons. [Preview Abstract] |
Monday, May 2, 2011 3:06PM - 3:18PM |
R7.00009: Early Neutrino data in the NOvA Near Detector On the Surface Minerba Betancourt NO$\nu$A is a long baseline neutrino experiment using an off- axis neutrino beam produced by the NuMI neutrino beam at Fermilab. The NO$\nu$A experiment will study neutrino oscillations from $\nu_{\mu}$ flavor to $\nu_e$ flavor. A short term goal for the NO$\nu$A experiment is to develop a good understanding of the response of the detector. These studies are being carried out with the full Near Detector installed on the surface at Fermilab (NDOS). This detector is currently running and will acquire neutrino data for a year. Using beam muon neutrino data, quasi-elastic charge-current interactions will be studied. Status of the NDOS running and early data will be shown. [Preview Abstract] |
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