2,972 research outputs found
A reconstruction method for neutrino induced muon tracks taking into account the apriori knowledge of the neutrino source
Gamma ray earthbound and satellite experiments have discovered, over the last
years, many galactic and extra-galactic gamma ray sources. The detection of
astrophysical neutrinos emitted by the same sources would imply that these
astrophysical objects are charged cosmic ray accelerators and help to resolve
the enigma of the origin of cosmic rays. A very large volume neutrino telescope
might be able to detect these potential neutrino emitters. The apriori known
direction of the neutrino source can be used to effectively suppress the
optical background and increase significantly the tracking efficiency
through causality filters. We report on advancing filtering and prefit
techniques using the known neutrino source direction and first results are
presented.Comment: 10 pages, 4 figures, to be published in Nucl. Inst. and Meth. A v2:
minor changes, 1 page adde
Accurate Estimation of the Trilinear Gauge Couplings Using Optimal Observables Including Detector Effects
This paper describes the definition of maximum likelihood equivalent
estimators of the Trilinear Gauge Couplings which include detector effects. The
asymptotic properties of these estimators as well as their unbiasedness and
efficiency when dealing with finite statistical samples are demonstrated by
Monte Carlo experimentation, using simulated events corresponding to the
production of q qbar lepton neutrino in e+ e- collisions at 172 GeV. Emphasis
is given to the determination of the expected efficiencies in extracting the
aWphi, aW and aBphi couplings from LEPII data, which in this particular case
found to be close to the maximum possible.Comment: 32 pages, 12 figures, Late
A Method to include Detector Effects in Estimators sensitive to the Trilinear Gauge Couplings
This paper describes the use of weighted Monte Carlo events to accurately
approximate integrals of functions of the experimentally measured kinematical
vectors and their dependence on physical parameters. This technique is
demonstrated in estimating the evolution of cross sections, efficiencies,
measured kinematical distributions and mean values as functions of the
Trilinear Gauge Couplings.Comment: 20 pages, 10 figures, Late
Extended Modified Observable Technique for a Multi-Parametric Trilinear Gauge Coupling Estimation at LEP II
This paper describes the extension of the Modified Observables technique in
estimating simultaneously more than one Trilinear Gauge Couplings. The optimal
properties, unbiasedness and consistent error estimation of this method are
demonstrated by Monte Carlo experimentation using four-fermion
final state topologies. Emphasis is given in the determination of the expected
sensitivities in estimating the and
pair of couplings with data from the 183
GeV LEPII run.Comment: (17 pages, 8 figures
Evaluation of the discovery potential of an underwater Mediterranean neutrino telescope taking into account the estimated directional resolution and energy of the reconstructed tracks
We report on the development of search methods for point-like and extended
neutrino sources, utilizing the tracking and energy estimation capabilities of
an underwater, Very Large Volume Neutrino Telescope (VLVnT). We demonstrate
that the developed techniques offer a significant improvement on the
telescope's discovery potential. We also present results on the potential of
the Mediterranean KM3NeT to discover galactic neutrino sources.Comment: 12 pages, 1 figure, to be published in Nucl. Inst. and Meth. A v2:
minor changes, 1 page adde
Multidimensional Binning Techniques for a Two Parameter Trilinear Gauge Coupling Estimation at LEP II
This paper describes two generalization schemes of the Optimal Variables
technique in estimating simultaneously two Trilinear Gauge Couplings. The first
is an iterative procedure to perform a 2-dimensional fit using the linear terms
of the expansion of the probability density function with respect to the
corresponding couplings, whilst the second is a clustering method of
probability distribution representation in five dimensions. The pair production
of W's at 183 GeV center of mass energy, where one W decays leptonically and
the other hadronically, was used to demonstrate the optimal properties of the
proposed estimation techniques.Comment: (25 pages, 11 figures
ANIS: High Energy Neutrino Generator for Neutrino Telescopes
We present the high-energy neutrino Monte Carlo event generator ANIS (All
Neutrino Interaction Simulation). The program provides a detailed and flexible
neutrino event simulation for high-energy neutrino detectors, such as AMANDA,
ANTARES or ICECUBE. It generates neutrinos of any flavor according to a
specified flux and propagates them through the Earth. In a final step neutrino
interactions are simulated within a specified volume. All relevant standard
model processes are implemented. We discuss strengths and limitations of the
program.Comment: 15 pages, 4 figure
- …