A5006072457- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Dark Matter and Cosmic Phenomena
- Astrophysics and Cosmic Phenomena
- Neutrino Physics Research
- Particle Detector Development and Performance
- Cosmology and Gravitation Theories
- Computational Physics and Python Applications
- Black Holes and Theoretical Physics
- Gamma-ray bursts and supernovae
- Particle Accelerators and Free-Electron Lasers
- Medical Imaging Techniques and Applications
- International Science and Diplomacy
- Radio Astronomy Observations and Technology
- Atomic and Subatomic Physics Research
- Solar and Space Plasma Dynamics
- Radiation Detection and Scintillator Technologies
- Particle accelerators and beam dynamics
- Radiation Therapy and Dosimetry
- Superconducting Materials and Applications
- Pulsars and Gravitational Waves Research
- Relativity and Gravitational Theory
- Galaxies: Formation, Evolution, Phenomena
- Geophysics and Gravity Measurements
Vanderbilt University
2013-2024
Karlsruhe Institute of Technology
2010-2021
Institute of High Energy Physics
2011-2019
Max Planck Institute for Nuclear Physics
2011-2019
RWTH Aachen University
2016-2018
TU Wien
2013-2018
The Graduate Center, CUNY
2017
Lehman College
2017
City University of New York
2017
American Museum of Natural History
2017
The Belle detector at the KEKB electron-positron collider has collected almost 1 billion Y(4S) events in its decade of operation. Super-KEKB, an upgrade is under construction, to increase luminosity by two orders magnitude during a three-year shutdown, with ultimate goal 8E35 /cm^2 /s luminosity. To exploit increased luminosity, been proposed. A new international collaboration Belle-II, being formed. Technical Design Report presents physics motivation, basic methods accelerator upgrade, as...
Within the framework of standard big-bang cosmology and electroweak model, it is shown that $\ensuremath{\nu}\overline{\ensuremath{\nu}}$ annihilation on $Z$ resonance only cosmic-ray process sensitive to relic neutrinos. For massive (${m}_{\ensuremath{\nu}}\ensuremath{\gtrsim}{10}^{\ensuremath{-}3}$ eV) neutrinos originating from a $z\ensuremath{\sim}3$ red-shifted source, 15% 50% absorption dip predicted at ${E}_{\ensuremath{\nu}}\ensuremath{\sim}{10}^{11}$ GeV.
We discuss the prospects for next generation neutrino telescopes, such as IceCube, to measure flavor ratios of high-energy astrophysical neutrinos. The expected at sources are ${\ensuremath{\varphi}}_{{\ensuremath{\nu}}_{e}}:{\ensuremath{\varphi}}_{{\ensuremath{\nu}}_{\ensuremath{\mu}}}:{\ensuremath{\varphi}}_{{\ensuremath{\nu}}_{\ensuremath{\tau}}}=1:2:0,$ and oscillations quickly transform these $1:1:1.$ can be deduced from relative rates showers $({\ensuremath{\nu}}_{e}$ charged current,...
Existing limits on the nonradiative decay of one neutrino to another plus a massless particle (e.g., singlet Majoron) are very weak. The best lifetime mass ratio come from solar observations and tau/m greater, similar 10(-4) s/eV for relevant eigenstate(s). For lifetimes even several orders magnitude longer, high-energy neutrinos distant astrophysical sources would decay. This strongly alter flavor ratios phi(nu(e)):phi(nu(mu)):phi(nu(tau))=1:1:1 expected oscillations alone should be readily...
Dark matter direct detection experiments have limited sensitivity to light dark (below a few GeV), due the challenges of lowering energy thresholds for nuclear recoil below $\mathcal{O}(\mathrm{keV})$. While impressive progress has been made on this front, remains least constrained region dark-matter parameter space. It shown that both ionization and excitation Migdal effect coherently emitted photon bremsstrahlung from recoiling atom can provide observable channels would otherwise missed...
We show that the observed zenith angle dependence of atmospheric neutrinos can be accounted for by neutrino decay. Furthermore, it is possible to account all anomalies with just three flavors. A decay model Majorana appears consistent big-bang nucleosynthesis and supernova constraints. The testable in near future.
Neutrinos may be pseudo-Dirac states, such that each generation is actually composed of two maximally mixed Majorana neutrinos separated by a tiny mass difference. The usual active neutrino oscillation phenomenology would unaltered if the splittings are $\ensuremath{\delta}{m}^{2}\ensuremath{\lesssim}{10}^{\ensuremath{-}12}\text{ }{\mathrm{e}\mathrm{V}}^{2}$; in addition, neutrinoless double beta decay highly suppressed. However, it possible to distinguish from Dirac using high-energy...
We investigate a mono-$Z$ process as potential dark matter search strategy at the LHC. In this channel single $Z$ boson recoils against missing transverse momentum, attributed to particles, $\ensuremath{\chi}$, which escape detector. This is related and complementary monojet monophoton searches. For illustrative purposes we consider $q\overline{q}\ensuremath{\rightarrow}\ensuremath{\chi}\ensuremath{\chi}Z$ in toy model, where emitted from either initial state quarks or internal propagator....
The CERN Large Hadron Collider (LHC) is designed to collide proton beams of unprecedented energy, in order extend the frontiers high-energy particle physics. During first very successful running period 2010--2013, LHC was routinely storing protons at 3.5--4 TeV with a total beam energy up 146 MJ, and even higher stored energies are foreseen future. This puts extraordinary demands on control losses. An un-controlled loss tiny fraction could cause superconducting magnet undergo transition into...
Very recently the IceCube Collaboration has reported an observation of 28 neutrino candidates with energies between 50 TeV and 2 PeV, constituting a 4.1$\sigma$ excess compared to atmospheric background. In this article we investigate compatibility data hypothesized unbroken power-law spectrum for various values spectral index \Gamma >= 2. We show that ~ 2.3 is consistent at 1.5$\sigma$ level observed events up PeV null higher energies. then assume sources are Galactic, deduce (i)...
Cosmological parameters deduced from the Planck measurements of anisotropies in cosmic microwave background are at some tension with direct astronomical various low redshifts. Very recently, it has been conjectured that this discrepancy can be reconciled if a certain fraction dark matter is unstable and decays between recombination present epoch. Herein we show superheavy relics have branching into neutrinos...
We consider the consequences for future neutrino factory experiments of small CPT-odd interactions in oscillations. The nu(&mgr;)-->nu(&mgr;) and nu;(&mgr;)-->nu;(&mgr;) survival probabilities at a baseline L = 732 km can test contributions orders magnitude better sensitivity than present sector limits. Interference between CPT-violating interaction CPT-even mass terms Lagrangian lead to resonant enhancement oscillation amplitude. For oscillations matter, simultaneous both antineutrino...
High energy cosmic ray experiments have identified an excess from the region of Galactic Plane in a limited range around $10^{18}$ eV (EeV). This is very suggestive neutrons as candidate primaries, because directional signal requires relatively-stable neutral and time-dilated can reach Earth typical distances when neutron exceeds EeV. We here point out that if messengers are neutrons, then those with energies below EeV will decay flight, providing flux antineutrinos above TeV which {\it...
We discuss a possible new resonance in active-sterile neutrino oscillations arising theories with large extra dimensions. Fluctuations the brane effectively increase path-length of active neutrinos relative to sterile through extra-dimensional bulk. Well below resonance, standard oscillation formulas apply. above are suppressed. show that energy range 30--400 MeV allows an explanation all data, including LSND consistent four-neutrino model. A high implies enhanced signal MiniBooNE. low...
Neutrino oscillations can be affected by decoherence induced e.g. Planck scale suppressed interactions with the space-time foam predicted in some approaches to quantum gravity. We study prospects for observing such effects at IceCube, using likely flux of TeV antineutrinos from Cygnus spiral arm. formulate statistical analysis evaluating sensitivity presence background atmospheric neutrinos, as well plausible cosmic neutrino sources. demonstrate that IceCube will improve...
view Abstract Citations (87) References (17) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Big bang cosmology, relic neutrinos, and absorption of neutrino cosmic rays Weiler, T. The proposal to search for neutrinos through their effect on the cosmic-ray flux is carefully examined. Resonant at E(v) about 10 21st eV-squared/m(1+z), where m mass z cosmological redshift source, has been previously predicted. However, it shown that detection in region requires...
Current experimental data on neutrino mixing are very well described by tribimaximal mixing. Accordingly, any phenomenological parametrization of the Maki-Nakagawa-Sakata-Pontecorvo matrix must build upon We propose one particularly natural parametrization, which we call ``triminimal.'' The three small deviations Particle Data Group angles from their values, and PDG phase, parametrize triminimal matrix. As an important example utility this new present simple resulting expressions for...