142,064 research outputs found
IceCube Sterile Neutrino Searches
Anomalies in short baseline experiments have been interpreted as evidence for
additional neutrino mass states with large mass splittings from the known,
active flavors. This explanation mandates a corresponding signature in the muon
neutrino disappearance channel, which has yet to be observed. Searches for muon
neutrino disappearance at the IceCube neutrino telescope presently provide the
strongest limits in the space of mixing angles for eV-scale sterile neutrinos.
This proceeding for the Very Large Volume Neutrino Telescopes (VLVnT) Workshop
summarizes the IceCube analyses that have searched for sterile neutrinos and
describes ongoing work toward enhanced, high-statistics sterile neutrino
searches.Comment: Proceeding for the VLVNT2018 Conferenc
Dynamical Pion Collapse and the Coherence of Conventional Neutrino Beams
In this paper we consider the coherence properties of neutrinos produced by
the decays of pions in conventional neutrino beams. Using a multi-particle
density matrix formalism we derive the oscillation probability for neutrinos
emitted by a decaying pion in an arbitrary quantum state. Then, using methods
from decoherence theory we calculate the pion state which evolves through
interaction with decay-pipe gases in a typical accelerator neutrino experiment.
These two ingredients are used to obtain the distance scales for neutrino beam
coherence loss. We find that for the known neutrino mass splittings, no
non-standard oscillation effects are expected on terrestrial baselines. Heavy
sterile neutrinos may experience terrestrial loss of coherence, and we
calculate both the distance over which this occurs and the energy resolution
required to observe the effect. By treating the pion-muon-neutrino-environment
system quantum mechanically, neutrino beam coherence properties are obtained
without assuming arbitrary spatial or temporal scales at the neutrino
production vertex.Comment: 13 pages, 10 figures. v2: Minor typographical corrections v3:
Accepted for publication in Phys.Rev.
New meanings from old buildings
The three modest house projects described here are by three fellow travellers — the two authors and David Lea — interested in the Organic side of Modernism. Conversational partners who have worked together in various capacities over many years, they share a common conviction about ‘working with the given
Vibrational transfer functions for base excited systems
Computer program GD203 develops transfer functions to compute governing vibration environment for complex structures subjected to a base motion
Nature of fault planes in solid neutron star matter
The properties of tectonic earthquake sources are compared with those deduced
here for fault planes in solid neutron-star matter. The conclusion that
neutron-star matter cannot exhibit brittle fracture at any temperature or
magnetic field is significant for current theories of pulsar glitches, and of
the anomalous X-ray pulsars and soft-gamma repeaters.Comment: 5 AAS LaTeX pages 1 eps figur
- …