970 research outputs found
Detector Depth Dependence of the High Energy Atmospheric Neutrino Flux
We note that detector depth can influence the decay path length available for
the primary and secondary particles that are the source of atmospheric
neutrinos. As a consequence there is a location dependent modulation to the
neutrino flux, which could be as large as 5-10% in some directions
History of "Anomalous" Atmospheric Neutrino Events: A First Person Account
The modern picture of the neutrino as a multiple mass highly mixed neutral
particle has emerged over 40 years of study. Best known of the issues leading
to this picture was the apparent loss of neutrinos coming from the sun. This
article describes another piece of evidence that supports the picture; the
substantial reduction of high energy muon type neutrinos observed in nature.
For much of the 40 year period, before the modern picture emerged this
observation was known as the "atmospheric neutrino anomaly", since as will be
seen, these neutrinos originate in the Earth's atmosphere.
This paper describes the discovery of the atmospheric neutrino anomaly. We
explore the scientific context and motivations in the late 1970's from which
this work emerged. The gradual awareness that the observations of atmospheric
neutrinos were not as expected took place in the 1983-1986 period.Comment: 46 pages, 24 figures. To be published in Physics in Perspective
Version 2 has a table of contents, a table of figures and the DOI added The
final publication is available at Springer via
http://dx.doi.org/10.1007/s00016-016-0185-
Inconsistencies in Interpreting the Atmospheric Neutrino Anomaly
We note a discrepancy between the value of R expected on the basis of the
muon neutrino angular distribution and the value actually observed. The energy
independence of leads to a fine tuning problem. This may be indicative of
some unaccounted for new physics.Comment: 3 pages, 5 figure
Studies of Radiative Penguin B Decays at BaBar
We summarize results on a number of observations of penguin dominated
radiative decays of the B meson. Such decays are forbidden at tree level and
proceed via electroweak loops. As such they may be sensitive to physics beyond
the standard model. The observations have been made at the BaBar experiment at
PEP-II, the asymmetric B factory at SLAC.Comment: 3 pages, 5 figure
Searching for Mass Concentrations with Precision Pulsar Timing
This papers searches for evidence of mass concentrations along the path of
radio pulses in the PPTA2 survey data release. Radio pulse travel times are
influenced via gravitational fields along the path from the source to the
observer. Transient time delays in transit are a useful measure of the matter
distribution along the path. Many pulsars have very well understood timing
solutions with predicable arrival times and can be used to sample the mass
variation. Changes in the source, observer and mass concentration positions
produce changes in arrival times which can be significant for precision pulsar
times. Twelve candidates are reported from this search.Comment: 8 pages, 15 figure
Gauge Singlet Scalars as Cold Dark Matter
In light of recent interest in minimal extensions of the Standard Model and
gauge singlet scalar cold dark matter, we provide an arXiv preprint of the
paper, published as Phys.Rev. D50 (1994) 3637, which presented the first
detailed analysis of gauge singlet scalar cold dark matter.Comment: 37 pages, 11 figures, LaTe
Experimental limits on nucleon decay and ΔB=2 processes
Results from the IMB collabration to detect possible proton decay in a salt mine near Cleveland, Ohio are presented. Detection apparatus is described.(AIP)Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/87900/2/1_1.pd
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