Bulletin of the American Physical Society
2007 APS April Meeting
Volume 52, Number 3
Saturday–Tuesday, April 14–17, 2007; Jacksonville, Florida
Session U13: Neutrino II |
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Sponsoring Units: DPF Chair: Stuart Freedman, Lawrence Berkeley National Laboratory Room: Hyatt Regency Jacksonville Riverfront City Terrace 9 |
Monday, April 16, 2007 3:30PM - 3:54PM |
U13.00001: Summary of the US long Baseline Neutrino Experiment Study Milind Diwan In this paper we will discuss the effort of the US long baseline neutrino experiment study, which was a joint effort from FNAL and BNL over the past year. This study focussed on evolving an ambitious US national program to study CP violation in neutrino physics using very large detectors and conventional neutrino beams. The two possibilities discussed in this effort were 1) placing a very large detector at a new Deep Underground Science and Engineering Laboratory with a new super neutrino beam from FNAL, or 2) placing very large detectors on the surface in the existing NuMI beamline at FNAL. The cost and feasiblity of the detectors, the event rates, and possible scenarios of accelerator and beam upgrades were part of the study. The large body of information including sensitivity to oscillation parameters is summarized in a draft report from this study group. [Preview Abstract] |
Monday, April 16, 2007 3:54PM - 4:06PM |
U13.00002: Electroweak radiative corrections to neutrino scattering at NuTeV Kwangwoo Park, Ulrich Baur, Doreen Wackeroth The $W$ boson mass extracted by the NuTeV collaboration from the ratios of neutral and charged-current neutrino and anti-neutrino cross sections differs from direct measurements performed at LEP2 and the Fermilab Tevatron by about $3 \sigma$. Several possible sources for the observed difference have been discussed in the literature, including new physics beyond the Standard Model (SM). However, in order to be able to pin down the cause of this discrepancy and to interpret this result as a deviation to the SM, it is important to include the complete electroweak one-loop corrections when extracting the $W$ boson mass from neutrino scattering cross sections. We will present results of a Monte Carlo program for $\nu N$ ($\bar \nu N$) scattering including the complete electroweak ${\cal O}(\alpha)$ corrections, which will be used to study the effects of these corrections on the extracted values for the electroweak parameters. We will briefly introduce some of the newly developed computational tools for generating Feynman diagrams and corresponding analytic expressions for one-loop matrix elements. [Preview Abstract] |
Monday, April 16, 2007 4:06PM - 4:18PM |
U13.00003: ABSTRACT WITHDRAWN |
Monday, April 16, 2007 4:18PM - 4:30PM |
U13.00004: Analysis of a Proposed Long Baseline Neutrino Oscillation Experiment Christine Lewis The Long Baseline Neutrino Experiment Study aims to find the best configuration for a second generation, accelerator-based neutrino experiment. One possible arrangement would use a baseline of 1300km, running from FNAL to the Homestake mine. Using a large water Cherenkov detector and a powerful beam, it will contribute to improved measurements of the neutrino oscillation parameters. This talk will focus on the experiment's sensitivity to the currently unknown mixing angle, $\theta_{13}$, and CP violation phase, $\delta_{CP}$, calculated using the GLoBES software. [Preview Abstract] |
Monday, April 16, 2007 4:30PM - 4:42PM |
U13.00005: The Daya Bay Reactor Neutrino Experiment Mary Bishai The 3x3 PMNS leptonic mixing matrix relates the mass and flavor eigenstates of the 3 known neutrinos. The $\theta_{13}$ mixing angle is the last unknown mixing angle in the PMNS matrix, the parameters of which must be determined experimentally. The goal of the Daya Bay experiment is to measure $\theta_{13}$ with a sensitivity in $\sin^2 (2\theta_{13})$ of 0.01. The Daya Bay experiment will search for the `disappearance' of reactor electron anti-neutrinos from the Daya Bay and Ling Ao Nuclear Power Plants located in Daya Bay, Guangdong, China using multiple identical detectors at different baselines. The status and prospects of the experiment will be presented. [Preview Abstract] |
Monday, April 16, 2007 4:42PM - 4:54PM |
U13.00006: Electromagnetic Content of Neutral versus Charged Current Neutrino Interactions Matt Seaton, Sanjib Mishra, Andrew Godley Asymmetric high energy photon conversion, where the electron carries most of the energy, in the hadronic shower of NC events will constitute the main background to the $\nu_e$ signal in theta-13 mixing experiments such as NO$\nu$A. The fine resolution NOMAD data can address this issue precisely. Measurements of the ratios of photon and $\pi^0$ to total visible energy, in hadronic $P_T$ bins, for NC and CC will be presented along with the method for obtaining them. These can be used to calibrate current Monte Carlo to accurately predict backgrounds for NO$\nu$A, and MINOS. [Preview Abstract] |
Monday, April 16, 2007 4:54PM - 5:06PM |
U13.00007: Measuring Active-Sterile Neutrino Oscillations with a Stopped Pion Neutrino Source Richard Van de Water, Bill Louis, Geoff Mills The question of the existence of light sterile neutrinos is of great interest in many areas of particle physics, astrophysics, and cosmology. Furthermore, should the MiniBooNE experiment at Fermilab confirm the LSND oscillation signal, then new measurements are required to identify the mechanism responsible for these oscillations. Possibilities include sterile neutrinos, CP or CPT violation, variable mass neutrinos, and Lorentz violation. Here we consider an experiment at a stopped pion neutrino source (the Spallation Neutron Source at ORNL) to determine if active-sterile neutrino oscillations with $\Delta m ^2$ greater than 0.1 eV$^2$ can account for the signal. By exploiting stopped $\pi^+$ decay to produce a monoenergetic $\nu_\mu$ source, and measuring the rate of the neutral current reaction $\nu_x \hspace{0.05in} ^{12}C \rightarrow \nu_x \hspace{0.05in} ^{12}C^{*}(15.11)$ as a function of distance from the source, we show that a convincing test for active-sterile neutrino oscillations can be performed. [Preview Abstract] |
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