Conveners
Parallel I: Neutrino Physics
- Xerxes Tata (University of Hawaii)
Parallel I: Neutrino Physics
- Tyce DeYoung (Michigan State University)
Parallel I: Neutrino Physics
- Serguey Petcov (SISSA)
T2K (Tokai to Kamioka) is the world's first off-axis designed long-baseline experiment that was built for precision measurement of neutrino oscillations. The T2K experiment uses a high intensity, highly pure beam of muon (anti)neutrinos produced at J-PARC in Tokai, Japan. A Near Detector complex, 280 m downstream of the target, is operated to monitor and characterize the (anti)neutrino beam...
The long-baseline neutrino experiment T2K uses one of the most intense and well understood GeV-scale neutrino sources in the world, combined with excellent detection capabilities using its near and far detectors. Beyond its primary goal of studying the standard 3-neutrino mixing model, it also provides an opportunity to search for exotic physics in the neutral lepton sector.
From both...
Neutrino interaction cross-section measurements on behalf of the T2K collaboration
First we give the formalism for heavy neutrino mixing with light neutrinos where we extend the SM to include n right-handed SM singlets along with the three generation of left-handed SM SU(2) doublets. We give the calculation of the four body decay $B_{c}^{-}\rightarrow J/\psi\ell_{1}^{-}\ell_{2}^{-}\pi^{+}$ and $B_{c}\rightarrow B_{s}^{0}\ell_{1}^{-}\ell_{2}^{-}\pi^{+}$. Explicit form of...
We study the effects of D-brane instantons wrapping rigid cycles on the $Z_2 \times Z_2$ toroidal orbifold. We compute Majorana masses induced by rigid D-brane instantons and realize bimaximal mixing matrices in certain models. We can also derive more generic mass matrices in other models. The bimaximal mixing Majorana mass matrix provides a possibility for explaining observed mixing angles....
In this study, we obtain the light neutrino masses and mixings consistent with the experiments, in the democratic texture approach. The essential ansatz is that $\nu_{Ri}$ are assumed to transform as ``right-handed fields'' $\bf 2_{R} + 1_{R}$ under the $S_{3L} \times S_{3R}$ symmetry. The symmetry breaking terms are assumed to be diagonal and hierarchical. This setup only allows the normal...
SHIP is a new general purpose fixed target facility, whose Technical Proposal has been recently reviewed by the CERN SPS Committee, who recommended that the experiment proceeds further to a Comprehensive Design phase. In its initial phase, the 400GeV proton beam extracted from the SPS will be dumped on a heavy target with the aim of integrating $2\times 10^{20}$ pot in 5 years. A dedicated...
Lepton-number violating neutrinoless double-beta decay plays a major role in determining neutrino properties. If the neutrino has a Majorana nature, detection of neutrinoless double beta decay may provide insight into the neutrino mass. The MAJORANA Collaboration is constructing an ultra-low background, modular high-purity Ge detector array to search for this decay in 76Ge. Located at the...
nEXO is currently in a research and development phase of a 5 tons detector for searching neutrinoless double beta decay of enriched Xe136. The nEXO detector is based on the successfully running EXO200, which has reached a sensitivity for the half life of the decay of 1.9 x 10^25 years with an exposure of 99.8 kgyr. The nEXO experiment will reach a half life sensitivity of > 5 x 10^27 years and...
We study parameter degeneracies that can occur in long-baseline neutrino
appearance experiments due to nonstandard interactions (NSI) in neutrino propagation.
For a single off-diagonal NSI parameter, and neutrino and antineutrino measurements at a
single $L/E$, there exists a continuous four-fold degeneracy (related to the mass hierarchy and $\theta_{23}$ octant) that renders the mass...
The OPERA experiment at the Gran Sasso underground laboratory has recently established nu_mu -> nu_tau oscillations in appearance mode with a significance of 5.1 sigma thanks to the observation of five signal candidate events in a sample with a signal-to-background
ratio of about ten. Now the nu_tau data analysis will be discussed, with emphasis on the background constraints obtained by using...
NOvA is a long-baseline accelerator-based neutrino oscillation experiment that is optimized for $\nu_\mu-\nu_e$ measurements. It uses the upgraded NuMI beam from Fermilab and measures $\nu_e$ appearance and $\nu_\mu$ disappearance at its Far Detector in Ash River, Minnesota. The $\nu_e$ appearance analysis at NOvA aims to resolve the neutrino mass hierarchy problem and to constrain the...
The neutrino mass hierarchy is one of the neutrino fundamental properties yet to be determined. We introduce a method to determine neutrino mass hierarchy by comparing the interaction rate of neutral current (NC) interactions, $\nu(\overline{\nu}) + p\rightarrow\nu(\overline{\nu}) + p$, and inverse beta decays (IBD), $\bar{\nu}_e + p\rightarrow n + e^+$, of supernova neutrinos in scintillation...
The Lorentz violation effects on the flavor transitions of high energy astrophysical neutrinos are studied. We show that stringent constraints on the Lorentz violation parameters can be derived from recent IceCube flavor ratio measurement on astrophysical neutrinos with energies between 25 TeV and 2.8 PeV. We present our results with both analytical approximations and full numerical calculations.
COHERENT
Coherent, elastic neutrino-nucleus scattering (CEvNS) was first predicted in 1974 as an essential process in the standard model of electroweak interactions. Forty-two years later it is still undetected. Taking advantage of technologies that have recently come to maturity, and the availability of a world-class pulsed neutrino source, the COHERENT collaboration seeks to make the...
RENO (Reactor Experiment for Neutrino Oscillation) is designed to measure
the neutrino mixing angle theta_13 and the effective mass squared difference |dm^2_ee|
using electron anti-neutrinos from six reactors at Hanbit nuclear power plant in S. Korea.
RENO has been taking data since August 2011 using two identical detectors at near and far sites.
The unprecedented measurement of the...
