Bulletin of the American Physical Society
APS April Meeting 2012
Volume 57, Number 3
Saturday–Tuesday, March 31–April 3 2012; Atlanta, Georgia
Session R11: Precision Neutrino Physics and Its Interpretation |
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Sponsoring Units: DNP Chair: Jonathan Link, Virginia Polytechnic Institute and State University Room: Embassy F |
Monday, April 2, 2012 1:30PM - 1:42PM |
R11.00001: OscSNS: A Precision Short-Baseline Neutrino Oscillation Experiment William Louis Short baseline neutrino experiments are consistent with neutrino oscillations at a $\Delta m^2$ of approximately 1 eV$^2$, and world neutrino and antineutrino data fit reasonably well to a 3+2 (active+sterile) neutrino oscillation model with CP violation. The OscSNS experiment at ORNL would be able to make precision short-baseline neutrino oscillation measurements and prove that sterile neutrinos exist. The OscSNS experiment will be described and the corresponding neutrino oscillation sensitivities will be discussed. [Preview Abstract] |
Monday, April 2, 2012 1:42PM - 1:54PM |
R11.00002: Testing the Validity of an Antineutrino Anomaly with High Precision Beta Spectra Gregory Keefer, Timothy Classen In January 2011 Mueller, T.A., et al. published a new method for predicting the antineutrino spectra which is derived from a complex fit to the fission beta spectra. They take into account many more beta spectra and nuclear effects than what was originally performed independently in the early 1980s by Vogel, P. and Schreckenbach, K. As a result of the improved prediction, Mueller and colleagues then published a re-analysis of the reactor fission beta spectra and the resultant antineutrino spectrum. They found that there is an uncertainty in the flux normalization of about 3\% from the early calculations and their much more elaborate approach. This has been dubbed the ``antineutrino anomaly.'' The current work is aimed to independently cross-check the methods, assumptions, and underlying beta theory in which the new calculation from Mueller, et al. heavily rely. The normalization uncertainty in the flux could be interpreted as a large mass splitting sterile neutrino and opens the venue for a profound amount of new physics, as well as casts doubt onto many years of previous work. As such, it is very important that we have a precise and independent cross-check of the elaborate method. I will present an overview of the problem and the status of the current work. [Preview Abstract] |
Monday, April 2, 2012 1:54PM - 2:06PM |
R11.00003: Photon Events at MiniBooNE Experiment Xilin Zhang, Brian D. Serot The neutral-current production of photon at MiniBooNE experiment is analyzed, which is motivated by the low-energy excess-event puzzle in the experiment [A. A. Aquilar-Arevalo et al. (MiniBooNE Collaboration), Phys. Rev. Lett. 100, 032301 (2008); Phys. Rev. Lett. 105, 181801 (2010)]. The calculation is done in a manifestly Lorentz-covariant framework, and includes contributions from Delta resonance's radiative decay and from non-resonance diagrams. The medium-effects are considered, including the modifications of Delta's behavior and nucleon's spectrum and Pauli blocking. Different kinds of event distributions are calculated based on the experimental setup. The possibility of the photon event to be the excess event will be discussed. The model-dependence of the results will also be presented. Possible connections of this analysis to other neutrino-oscillation experiment will be mentioned. [Preview Abstract] |
Monday, April 2, 2012 2:06PM - 2:18PM |
R11.00004: Radiative corrections to anti-neutrino proton scattering Fred Myhrer, Udit Raha, Kuniharu Kubodera For the low-energy anti-neutrino reaction, $\bar{\nu}_e + p \to e^+ + n$, which is of great current interest in connection with on-going high-precision neutrino-oscillation experiments, we calculate the differential cross section in a model-independent effective field theory (EFT), taking into account radiative corrections of order $\alpha$. In our low-energy EFT, the order-$\alpha$ radiative corrections are considered to be of the same order as the nucleon recoil corrections, which include the ``weak magnetism" contribution. In EFT, the short-distance radiative corrections are subsumed into well-defined low-energy constants the values of which can in principle be determined from the available neutron beta-decay data. Furthermore, EFT allows for a systematic evaluation of higher order corrections, providing estimates of theoretical uncertainties in our results. [Preview Abstract] |
Monday, April 2, 2012 2:18PM - 2:30PM |
R11.00005: Issues in Neutrino-Nucleus Scattering ($0.3 < E_{\nu} < 3.0$ GeV) Gerry Garvey Recently published differential cross sections for $\mu_{\nu} + ^{12}$C charged current quasi-elastic scattering (CCQE) by the MiniBooNE collaboration are $\sim$40$ \%$ larger than typical impulse approximations calculations of CCQE. Some of the difference is due to poor communication between the theorists and experimentalists as to the definition of CCQE scattering. More fundamentally, the observed cross section appears to be larger than the CCQE cross section on 6 free neutrons. Some earlier work on electron quasi-elastic scattering demonstrated that short-range correlations plus two-body currents greatly enhance the nuclear transverse-vector response in agreement with experiment. Extending this approach to neutrino CCQE is necessary. A direct consequence of the approach is that the assigned incident neutrino energy is more uncertain than previously realized which can influence the interpretation of neutrino oscillation experiments. [Preview Abstract] |
Monday, April 2, 2012 2:30PM - 2:42PM |
R11.00006: Neutrino Exclusive Charged Current Quasi-Elastic Scattering in MINERvA Tammy Walton The MINERvA experiment will measure neutrino and antineutrino quasi-elastic scattering on helium, water, carbon, iron, and lead for neutrinos in the few GeV range. We will present an overview of MINERvA analysis plan for neutrino exclusive charged current quasi-elastic scattering on lead, iron, and carbon. [Preview Abstract] |
Monday, April 2, 2012 2:42PM - 2:54PM |
R11.00007: Exclusive Neutrino Charged Current Coherent Pion Production Cross Section Measurements in MINERvA A. Higuera MINERvA (Main Injector Experiment for v-A) is a neutrino scattering experiment in the 1-10 GeV energy range in the NuMI high-intensity neutrino beam at Fermi National Accelerator Laboratory. MINERvA is measuring neutrino/antineutrino scattering off a variety of different nuclear materials (C, Fe, Pb, He, H2O) and plans to measure the A-dependence of the Charged Current Coherent Pion Production cross section. We provide an outline of this measurement including the expected event rates and our methods for differentiating signal from background. [Preview Abstract] |
Monday, April 2, 2012 2:54PM - 3:06PM |
R11.00008: Study of $\nu_\mu + e$ elastic scattering in MINER$\nu$A experiment Jaewon Park $\nu_\mu + e$ elastic scattering is a theoretically well predicted leptonic process. It has a distinct final state of a single, very forward electron. Measurement of the rate of such events provides a useful constraint on the muon neutrino flux incident on the MINER$\nu$A detector. I present the status of single electron reconstruction and comparison of data and simulation. [Preview Abstract] |
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