258 research outputs found
Solar neutrino measurements in Super-Kamiokande-I
The details of Super--Kamiokande--I's solar neutrino analysis are given.
Solar neutrino measurement in Super--Kamiokande is a high statistics collection
of B solar neutrinos via neutrino-electron scattering. The analysis method
and results of the 1496 day data sample are presented. The final oscillation
results for the data are also presented.Comment: 32pages, 57figures, submitted to Physical Review
Three flavor neutrino oscillation analysis of atmospheric neutrinos in Super-Kamiokande
We report on the results of a three-flavor oscillation analysis using
Super-Kamiokande~I atmospheric neutrino data, with the assumption of one mass
scale dominance (0). No significant flux change due to
matter effect, which occurs when neutrinos propagate inside the Earth for
0, has been seen either in a multi-GeV -rich sample
or in a -rich sample. Both normal and inverted mass hierarchy
hypotheses are tested and both are consistent with observation. Using
Super-Kamiokande data only, 2-dimensional 90 % confidence allowed regions are
obtained: mixing angles are constrained to and for the normal mass hierarchy. Weaker constraints,
and , are obtained
for the inverted mass hierarchy case.Comment: 7 figures, 3 table
Search for Astrophysical Neutrino Point Sources at Super-Kamiokande
It has been hypothesized that large fluxes of neutrinos may be created in
astrophysical "cosmic accelerators." The primary background for a search for
astrophysical neutrinos comes from atmospheric neutrinos, which do not exhibit
the pointlike directional clustering that characterizes a distant astrophysical
signal. We perform a search for neutrino point sources using the upward-going
muon data from three phases of operation (SK-I, SK-II, and SK-III) spanning
2623 days of live time taken from April 1, 1996 to August 11, 2007. The search
looks for signals from suspected galactic and extragalactic sources, transient
sources, and unexpected sources. We find interesting signatures from two
objects--RX J1713.7-3946 (97.5% CL) and GRB 991004D (95.3% CL)--but the
signatures lack compelling statistical significance given trial factors. We set
limits on the flux and fluence of neutrino point sources above energies of 1.6
GeV
Study of Non-Standard Neutrino Interactions with Atmospheric Neutrino Data in Super-Kamiokande I and II
In this paper we study non-standard neutrino interactions as an example of
physics beyond the standard model using atmospheric neutrino data collected
during the Super-Kamiokande I(1996-2001) and II(2003-2005) periods. We focus on
flavor-changing-neutral-currents (FCNC), which allow neutrino flavor
transitions via neutral current interactions, and effects which violate lepton
non-universality (NU) and give rise to different neutral-current
interaction-amplitudes for different neutrino flavors. We obtain a limit on the
FCNC coupling parameter, varepsilon_{mu tau}, |varepsilon_{mu tau}|<1.1 x
10^{-2} at 90%C.L. and various constraints on other FCNC parameters as a
function of the NU coupling, varepsilon_{e e}. We find no evidence of
non-standard neutrino interactions in the Super-Kamiokande atmospheric data.Comment: 12 Pages, 14 figures. To be submitted to Phys. Rev.
Search for Matter-Dependent Atmospheric Neutrino Oscillations in Super-Kamiokande
We consider muon neutrino to tau neutrino oscillations in the context of the
Mass Varying Neutrino (MaVaN) model, where the neutrino mass can vary depending
on the electron density along the flight path of the neutrino. Our analysis
assumes a mechanism with dependence only upon the electron density, hence
ordinary matter density, of the medium through which the neutrino travels.
Fully-contained, partially-contained and upward-going muon atmospheric neutrino
data from the Super--Kamiokande detector, taken from the entire SK--I period of
1489 live days, are compared to MaVaN model predictions. We find that, for the
case of 2-flavor oscillations, and for the specific models tested, oscillation
independent of electron density is favored over density dependence. Assuming
maximal mixing, the best-fit case and the density-independent case do not
differ significantly.Comment: 6 pages, 1 figur
Inter-Destination Multimedia Synchronization; Schemes, Use Cases and Standardization
Traditionally, the media consumption model
has been a passive and isolated activity. However, the
advent of media streaming technologies, interactive social
applications, and synchronous communications, as well as
the convergence between these three developments, point
to an evolution towards dynamic shared media experiences.
In this new model, geographically distributed groups of
consumers, independently of their location and the nature
of their end-devices, can be immersed in a common virtual
networked environment in which they can share multimedia
services, interact and collaborate in real-time within
the context of simultaneous media content consumption. In
most of these multimedia services and applications, apart
from the well-known intra and inter-stream synchronization
techniques that are important inside the consumers
playout devices, also the synchronization of the playout
processes between several distributed receivers, known as
multipoint, group or Inter-destination multimedia synchronization
(IDMS), becomes essential. Due to the
increasing popularity of social networking, this type of
multimedia synchronization has gained in popularity in
recent years. Although Social TV is perhaps the most
prominent use case in which IDMS is useful, in this paper
we present up to 19 use cases for IDMS, each one having
its own synchronization requirements. Different approaches
used in the (recent) past by researchers to achieve
IDMS are described and compared. As further proof of the
significance of IDMS nowadays, relevant organizations
(such as ETSI TISPAN and IETF AVTCORE Group)
efforts on IDMS standardization (in which authors have
been and are participating actively), defining architectures
and protocols, are summarized.This work has been financed, partially, by Universitat Politecnica de Valencia (UPV), under its R&D Support Program in PAID-05-11-002-331 Project and in PAID-01-10, and by TNO, under its Future Internet Use Research & Innovation Program. The authors also want to thank Kevin Gross for providing some of the use cases included in Sect. 1.2.Montagud, M.; Boronat Segui, F.; Stokking, H.; Van Brandenburg, R. (2012). Inter-Destination Multimedia Synchronization; Schemes, Use Cases and Standardization. Multimedia Systems. 18(6):459-482. https://doi.org/10.1007/s00530-012-0278-9S459482186Kernchen, R., Meissner, S., Moessner, K., Cesar, P., Vaishnavi, I., Boussard, M., Hesselman, C.: Intelligent multimedia presentation in ubiquitous multidevice scenarios. 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Search for Nucleon Decay into Charged Anti-lepton plus Meson in Super-Kamiokande I and II
Searches for a nucleon decay into a charged anti-lepton (e^+ or {\mu}^+) plus
a light meson ({\pi}^0, {\pi}^-, {\eta}, {\rho}^0, {\rho}^-, {\omega}) were
performed using the Super-Kamiokande I and II data. Twelve nucleon decay modes
were searched for. The total exposure is 140.9 kiloton \cdot years, which
includes a 91.7 kiloton \cdot year exposure (1489.2 live days) of
Super-Kamiokande-I and a 49.2 kiloton \cdot year exposure (798.6 live days) of
Super-Kamiokande-II. The number of candidate events in the data was consistent
with the atmospheric neutrino background expectation. No significant evidence
for a nucleon decay was observed in the data. Thus, lower limits on the nucleon
partial lifetime at 90% confidence level were obtained. The limits range from
3.6 \times 10^31 to 8.2 \times 10^33 years, depending on the decay modes.Comment: 25 pages, 18 figure
A Measurement of Atmospheric Neutrino Flux Consistent with Tau Neutrino Appearance
A search for the appearance of tau neutrinos from \mutau oscillations in the
atmospheric neutrinos has been performed using 1489.2 days of atmospheric
neutrino data from the Super-Kamiokande-I experiment. A best fit tau neutrino
appearance signal of 138 48 (stat.) (sys.) events is
obtained with an expectation of 78 26 (sys.). The hypothesis of no tau
neutrino appearance is disfavored by 2.4 sigma.Comment: 5 pages, 3 figures, 3 tables, submitted to PR
Evidence for the Appearance of Atmospheric Tau Neutrinos in Super-Kamiokande
Super-Kamiokande atmospheric neutrino data were fit with an unbinned maximum
likelihood method to search for the appearance of tau leptons resulting from
the interactions of oscillation-generated tau neutrinos in the detector.
Relative to the expectation of unity, the tau normalization is found to be
1.42 \pm 0.35 \ (stat) {\}^{+0.14}_{-0.12}\ (syst) excluding the
no-tau-appearance hypothesis, for which the normalization would be zero, at the
3.8 level. We estimate that 180.1 \pm 44.3\ (stat)
{\}^{+17.8}_{-15.2}\ (syst) tau leptons were produced in the 22.5 kton
fiducial volume of the detector by tau neutrinos during the 2806 day running
period. In future analyses, this large sample of selected tau events will allow
the study of charged current tau neutrino interaction physics with oscillation
produced tau neutrinos.Comment: 7 pages, 4 figures. This is the version as published in Physical
Review Letters including the supplemental figure. A typographical error in
the description of figure 3 is also correcte
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