Bulletin of the American Physical Society
APS April Meeting 2013
Volume 58, Number 4
Saturday–Tuesday, April 13–16, 2013; Denver, Colorado
Session L12: Neutrino Physics |
Hide Abstracts |
Sponsoring Units: DPF Chair: Bob Bernstein, Fermi National Accelerator Laboratory Room: Plaza Court 1 |
Sunday, April 14, 2013 3:30PM - 3:42PM |
L12.00001: Measurement of the Neutrino Velocity in MINOS Ioana Maria Anghel The MINOS experiment uses two neutrino detectors separated by 734km between Fermilab and the Soudan Underground Laboratory. Two measurements of the neutrino time of flight were conducted between the two detectors. The first analysis extended the initial MINOS measurement based on one year of data published in 2007. This analysis benefited from the statistics accumulated during 6 years of data taking. The second analysis was done using the data collected during 2012 making use of a new system of clocks which provided a more precise measurement of time at the primary proton target, the Near and the Far detectors. Using the resulting neutrino time of flight between the MINOS detectors we present an improved neutrino velocity measurement. [Preview Abstract] |
Sunday, April 14, 2013 3:42PM - 3:54PM |
L12.00002: Neutrino and Superluminal Limiting Velocity Josip Soln From the relativistic kinematics one derives the relativistic bicubic equation for the particle limiting velocity in the arbitrary reference frame. The three solutions, in quadratic forms, depending on the particle mass, m, energy, E, and the ordinary velocity, v, are all given in exact forms. In a frame where mv$^2$/E is very small, the solutions are given as Taylor series from which one recognizes just one solution as physically acceptable and denoting it as C. For a massless particle, m=o, C=v, the particle velocity,while for a photon C becomes luminal, C=c, with c the light velocity. In the OPERA experiment [1], one measures the muon neutrino velocity with E=17GeV at a distance of 730 km. The mass of the neutrino pushes the C values upward from c which, however is neutralized by a large value of E and could be neglected. Restricting ourselves to the OPERA results for which v $>$,=c,and for the sake of completeness, assuming m=0.05eV, the solution for C turns out to be slightly larger than c, C $>$,=c, with the largest value C=1.000002c.\\[4pt] [1] T. Adam et al., arXiv:1212.1276 [Preview Abstract] |
Sunday, April 14, 2013 3:54PM - 4:06PM |
L12.00003: Cosmic Neutrino Flavor Ratios with Broken $\nu_\mu$--$\nu_\tau$ Symmetry Lingjun Fu, Chiu Man Ho, Thomas Weiler Reactor experiments have very recently measured the neutrino mixing angle $\theta_{13}$, the final angle in the trilogy. Reactor neutrino experiments have now observed a nonzero value for $\theta_{13}$ at $\,5\sigma$, and global fits to data imply a nonzero value above $\,10\sigma$. Nonzero values for $\theta_{13}$ and/or $\theta_{32}$-$\frac{\pi}{4}$ break a $\nu_\mu$-$\nu_\tau$ symmetry, which has qualitative as well as quantitative implications for the time-evolution of neutrino flavors. In particular, the large-distance flavor evolution matrix, non-invertible with $\nu_\mu$-$\nu_\tau$ symmetry, is now invertible. This means that measurements of neutrino flavor ratios at Earth can now be inverted to directly reveal the flavor ratios injected at cosmically distant sources. With the updated values of the three neutrino mixing angles, we obtain the inverted large-distance evolution matrix and use it to derive several phenomenological relations between the injection flavor ratios and the observable ratios at Earth. Taking the three popular injection models as examples, we also exhibit the shift of Earthly observed flavor ratios from the corresponding values in the case with $\nu_\mu$-$\nu_\tau$ symmetry. [Preview Abstract] |
Sunday, April 14, 2013 4:06PM - 4:18PM |
L12.00004: Searching Magnetic Monopoles With NO$\nu$A Far Detector Zukai Wang The NO$\nu$A collaboration has begun construction of a 14 kton far detector at Ash River, Minnesota. This is a totally active, well-segmented detector that will enable sensitive searches for various exotic phenomena, including magnetic monopoles. We will present the current status of this effort, as well as the sensitivity expected from a multi-year run. [Preview Abstract] |
Sunday, April 14, 2013 4:18PM - 4:30PM |
L12.00005: A Large Water-based Liquid Scintillation Detector in Search for Proton Decay $p \to K^{+} \bar\nu$ and Other Physics Chao Zhang Water-based liquid scintillator (WbLS) is a novel particle detection medium that is mass-producible, cost-effective with high optical performance. It opens the possibility to low energy phenomena that are inaccessible to water Cherenkov detectors. In this talk, we will present the Geant4 based Monte Carlo simulation results of proton decay in the decay channel $p \to K^{+} \bar\nu$ in a 20 kilo-ton WbLS detector. From the simulations an efficiency of 88\% for the detection of a proton decay has been determined. The potential backgrounds in the detection energy window have been examined. Within 10 years of measuring time a lower limit of proton lifetime, concerning the decay channel investigated, of $\tau > 2 \times 10^{34}$ y (at 90\% C.L.) could be reached. In addition to proton decay, the application of WbLS in other physics, such as in neutrino-less double beta decay and reactor neutrino monitoring will be discussed. [Preview Abstract] |
Sunday, April 14, 2013 4:30PM - 4:42PM |
L12.00006: Kaon decay-at-rest as a probe of the sterile neutrino Joshua Spitz A number of observed anomalies in neutrino oscillation experiments can be explained by the existence of a new fundamental particle called the sterile neutrino. A definitive experiment is needed in order to determine if such a particle exists or not. A detector placed $\sim$100 m from an intense source of $>$3 GeV protons can be used to search for electron neutrino appearance with the monoenergetic 235.5 MeV muon neutrino flux from charged kaon decay-at-rest. Such an observation would be consistent with the existence of at least one sterile neutrino. The detector can also be used to concurrently search for the appearance and disappearance of neutrinos and antineutrinos from pion/muon decay-at-rest as well. The combination of these measurements would be a definitive probe of the sterile neutrino with neutrinos and antineutrinos and in both appearance and disappearance channels. I will present the kaon decay-at-rest sterile neutrino search idea and the possibility of experimentally pursuing it in the near future. [Preview Abstract] |
Sunday, April 14, 2013 4:42PM - 4:54PM |
L12.00007: A search for non-standard neutrino interactions in MINOS Zeynep Isvan MINOS searches for neutrino and antineutrino oscillations using the disappearance of muon neutrinos from the NuMI beam between two detectors, over a baseline of 735 km. We have previously reported measurements of oscillations from separate and combined muon neutrino and antineutrino samples. We use the apparent difference in neutrino and antineutrino disappearance to search for non-standard interactions (NSI) with matter which could occur during propagation through the Earth's crust to the Far Detector, and present new constraints obtained by analyzing a combined set of $\nu_{\mu}$ and $\overline{\nu}_\mu$ data. Finally, we discuss potential significant improvements to these constraints during MINOS+ running. [Preview Abstract] |
Sunday, April 14, 2013 4:54PM - 5:06PM |
L12.00008: IsoDAR - A Definitive Search for Sterile Neutrinos William Barletta The steady development of high power cyclotrons, mostly in industry, is making possible a definitive, highly cost effective approach to the search for sterile neutrinos. In the proposed IsoDAR experiment a 600 kW beam of protons from a 60 MeV, H2+ cyclotron will impinge on a lithium target to generate copious Li-8. The Li-8 then decays at rest to yield a powerful source of anti-neutrinos that can be located $\sim$20 m from a hydrogenous detector. In particular our collaboration has been designing the accelerator / target system to be consistent with installation in the Kamioka mine to use the Kamland detector to record inverse beta decay events. We show that this source / detector combination can reveal or exclude the global-fit allowed region at 5 sigma in four months and differentiate between 1 and 2 sterile neutrinos with a few years of continued running. Our studies also show that high power cyclotrons will provide the most cost effective source for such an experiment. In addition, the 60 MeV IsoDAR cyclotron would be an ideal injector for DAEdALUS, our approach to measuring CP violation in the neutrino sector with decay-at-rest experiment. [Preview Abstract] |
Sunday, April 14, 2013 5:06PM - 5:18PM |
L12.00009: Tau neutrino as a probe of nonstandard interactions via charged Higgs and W' contribution Ahmed Rashed, Murugeswaran Duraisamy, Alakabha Datta We consider charged Higgs and W' gauge boson contributions to the quasielastic, $\Delta$-resonance, and deep inelastic processes in the tau-neutrino nucleon scattering $\nu_{\tau}+ N \rightarrow \tau^- + X$ and $\bar{\nu}_{\tau}+ N \rightarrow \tau^+ + X$. These effects modify the standard model cross section for these processes and thus impact the extraction of the neutrino mixing angles $\theta_{23}$ and $\theta_{13}$. We include form factor effects in our calculations and find the deviation of the actual mixing angle from the measured one, assuming the standard model cross section, can be significant and can depend on the energy of the neutrino. [Preview Abstract] |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700