Bulletin of the American Physical Society
APS April Meeting 2013
Volume 58, Number 4
Saturday–Tuesday, April 13–16, 2013; Denver, Colorado
Session X12: Neutrino Detector Development |
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Sponsoring Units: DPF DNP Chair: Bob Bernstein, Fermi National Accelerator Laboratory Room: Plaza Court 1 |
Tuesday, April 16, 2013 10:45AM - 10:57AM |
X12.00001: Future Neutrino Oscillation Sensitivities for Long-Baseline Experiments Matthew Bass, Daniel Cherdack, Robert Wilson Long-baseline neutrino experiments have the ability to measure the parameters of the mixing matrix that describes neutrino oscillations. Projecting the sensitivity of current and future experiments to these parameters plays a critical role in planning the next generation of experiments. After a brief introduction to neutrino oscillations preliminary, future sensitivity projections from a combined analysis for the Tokai to Kamioka (T2K), NuMI Off-Axis Electron-neutrino Appearance (NO$\nu$A), and Long-Baseline Neutrino (LBNE) experiments will be presented with particular emphasis on the methods used and the ability of these experiments to constrain the oscillation parameters. [Preview Abstract] |
Tuesday, April 16, 2013 10:57AM - 11:09AM |
X12.00002: Comparison of $\nu_{\mu}\rightarrow\nu_{e}$ Oscillation calculations with matter effects Michael Gordon, Walter Toki An introduction to neutrino oscillations in vacuum is presented, followed by a survey of various techniques for obtaining either exact or approximate expressions for $\nu_{\mu}\rightarrow\nu_{e}$ oscillations in matter. The method devised by Mann, Kafka, Schneps, and Altinok produces an exact expression for the oscillation by determining explicitely the evolution operator. The method used by Freund yields an approximate oscillation probability by diagonalizing the Hamiltonian, finding the eigenvalues and eigenvectors, and then using those to find modified mixing angles with the matter effect taken into account. The method developed by Arafune, Koike, and Sato uses an alternate method to find an approximation of the evolution operator. These methods are compared to each other using parameters from both the T2K and LBNE experiments. [Preview Abstract] |
Tuesday, April 16, 2013 11:09AM - 11:21AM |
X12.00003: Muon Detectors at the Near Site of Long-Baseline Neutrino Experiment Daniel Poulson The Long-Baseline Neutrino Experiment (LBNE) is designed to make precision measurement of $\nu_{\mathrm{\mu }} \quad \to \quad \nu_{\mathrm{e}}$ oscillations and increase understanding of CP violation. Critical to this experiment is detection of the initial neutrino flux at the near site facility at Fermilab. By understanding the flux, energy, and composition of the tertiary muon beam the characteristics of the initial neutrino beam can be extrapolated. There are three detectors at the near site for muon measurement: muon ionization counter, muon Cherenkov detectors, and stopped muon detectors. The muon ionization provides a basic flux profile. The muon Cherenkov detectors provide information on the energy distribution of the muon beam. The stopped muon detectors are small Cherenkov detectors that provide information about the spectrum and normalization of the muon beam. The focus of this talk will be on the design and expected performance of each of these muon detectors. [Preview Abstract] |
Tuesday, April 16, 2013 11:21AM - 11:33AM |
X12.00004: A Fast MC for LBNE Daniel Cherdack, Bob Wilson, Matt Bass The Long Baseline Neutrino Experiment (LBNE) science collaboration seeks to build a large ($\mathcal{O}$~10~$kt$) Liquid Argon Time Projection Chamber (LAr TPC) neutrino detector $1300~km$ downstream of a wide band neutrino beam originating at Fermi National Accelerator Lab. Optimization of the beam and detector design to maximize sensitivity to the neutrino mass hierarchy (MH), and the CP violating phase, $\delta_{CP}$, requires a full Monte Carlo (MC) simulation. Since much of the full MC simulation is still under development, a Fast MC simulation has been implemented. The Fast MC utailizes the more mature and less CPU intensive components of the full MC chain, namely the beam simulation and physics interaction models, while replacing the detector response and event reconstruction with parameterizations. In addition, a rudimentary event selection algorithm is used to isolate analysis samples. Combined with a modified version of GLoBES, the Fast MC can propagate systematic uncertainties and the effects of design changes to sensitivity calculations. Preliminary estimates of analysis sample event rates and systematic uncertainties generated using the Fast MC, and the resulting predictions for sensitivity to MH and CP violation will be presented. [Preview Abstract] |
Tuesday, April 16, 2013 11:33AM - 11:45AM |
X12.00005: Outer Detector Events at T2K Taritree Wongjirad In the long-baseline neutrino oscillation experiment, T2K, the Super-Kamiokande (Super-K) detector is used to detect neutrino interactions from a beam 295 km away. Super-K is a 40 kTon water Cerenkov detector that is divided into two segments: a cylindrical inner volume, the Inner Detector (ID), nested inside a cylindrical outer volume, the Outer Detector (OD). Typically, the OD's role is to act as a cosmic ray veto for the ID. However, in T2K, events that involve signals in the OD can be kept for use in neutrino analyses. This is because the background event rate is highly suppressed when events are accepted within the small time window coincident with the arrival of beam neutrinos at Super-K. In this talk, I will describe the techniques used to select neutrino events involving the OD and possible future analyses that use these events. [Preview Abstract] |
Tuesday, April 16, 2013 11:45AM - 11:57AM |
X12.00006: Incorporating Multi-Nucleon Effects in T2K's Neutrino Interaction Simulation Software. Jaclyn Schwehr The interaction of neutrinos with heavy nuclei is a field of study that has grown rapidly as more experiments are built with heavier targets. Neutrinos interacting with these targets are thought to interact with not just single nucleons, but also with correlated groups of nucleons. A number of different theories exist that describe these multi-nucleon interactions, but to be able to compare these theories with one another or to data requires a way to work them into the neutrino interaction simulation software. The T2K experiment uses NEUT (the neutrino interaction simulation program at Super-K) in the study of neutrino cross sections. In the interest of simulating neutrino interactions more accurately, new interaction models need to be incorporated into this simulation package. This talk will discuss the discrepancies between measurements done with neutrinos interacting on light verses heavy nuclei, a few of the models describing these discrepancies, and finally how these models are being incorporated into NEUT.? [Preview Abstract] |
Tuesday, April 16, 2013 11:57AM - 12:09PM |
X12.00007: Measurement of High Energy $\nu_{e}$ in the T2K beam using ND280 P0D Jay Hyun Jo, Jeanine Adam The T2K experiment is a long baseline neutrino experiment designed to directly measure $\nu_{\mu } \longrightarrow \nu_{e}$ oscillation, thereby provide a measurement of the neutrino mixing angle $\theta _{\mathrm{13}}$. A firm understanding of the $\nu_{e}$ intrinsic to T2K's predominantly $\nu_{\mu }$ beam is vital for an accurate $\nu _{e}$ appearance measurement. To this end, the $\pi^{\mathrm{0}}$ detector (P0D) in T2K off-axis near detector (ND280) measured the high energy part ($\ge $1.5 GeV) of the $\nu_{e}$ contamination, which is predominantly from Kaon decays during beam production, and compared this to the prediction used for T2K's latest oscillation results. We present the details of this analysis, including the selection criteria and systematic errors considered, as well as the use of this measurement to confirm the $\nu_{e}$ flux prediction. In addition, we will discuss about preliminary on-water analysis of $\nu_{e}~$interactions, using P0D. [Preview Abstract] |
Tuesday, April 16, 2013 12:09PM - 12:21PM |
X12.00008: Introduction to the \(\pi^{0}\) Detector (P0D) of the Tokai to Kamioka (T2K) Experiment Near Detector and the Alignment of the P0D Alex Clifton An introduction to the off-axis P0D of the T2K experiment is presented as well as a physical and computational alignment method for the P0D. ND280 is located 280 m downstream from the T2K graphite target and is off axis by 2.5\(^{\circ}\) with respect to the neutrino beam line. ND280 is a composite detector consisting of a Side Muon Range Detector (SMRD), Electric Calorimeters (ECALs), the P0D, and the Tracker which consists of several Time Projection Chambers (TPCs) and Fine Grain Detectors (FGDs). A repeatable survey method was implemented utilizing a laser leveler, plumb-bob, plumb-line, and detachable hooks in order to check the alignment of the P0D. In addition to this method, cosmic ray data and software tools are used as a means to check the alignment results produced by the survey method. Alignment results are important for particle track matching between the Tracker and the P0D for a \(\nu_{\mu}\) Charged Current Inclusive analysis. [Preview Abstract] |
Tuesday, April 16, 2013 12:21PM - 12:33PM |
X12.00009: Neutrino-induced neutral-current elastic (NCE) scattering in the P0D in the T2K experiment Daniel Ruterbories The T2K experiment is a second generation long baseline neutrino oscillation experiment designed to search for the appearance of an electron type neutron oscillating from a muon type neutrino. The PiZero sub-detector (P0D) of the T2K off-axis near detector ND280 is used to characterize the neutrino beam and to measure neutrino cross-sections. The T2K neutrino narrow band beam peaks at $\sim$700MeV, where experimental knowledge of these cross-sections is limited. The NCE measurement provides a probe into the fundamental structure of the target nucleons, an understanding of final state interactions in the target nucleus, as well as a way to compare models to data in comparisons between NCE and the dominant charge-current analog to this process. I will give an overview of the NCE interaction in this energy region and present the current status of the ongoing data analysis. [Preview Abstract] |
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