15 research outputs found

    Accurate Estimation of the Trilinear Gauge Couplings Using Optimal Observables Including Detector Effects

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    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

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    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

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    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 â„“Îœjj\ell \nu jj four-fermion final state topologies. Emphasis is given in the determination of the expected sensitivities in estimating the Î»Îłâˆ’Î”g1z\lambda_{\gamma} - \Delta g_{1}^{z} and Δkγ−Δg1z\Delta k_{\gamma} - \Delta g_{1}^{z} pair of couplings with data from the 183 GeV LEPII run.Comment: (17 pages, 8 figures

    Multidimensional Binning Techniques for a Two Parameter Trilinear Gauge Coupling Estimation at LEP II

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    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

    Calibration Procedures for Accurate Timing and Directional Reconstruction of EAS Particle-fronts with Astroneu Stations

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    International audienceThe Astroneu array consists of three autonomous Extensive Air Shower (EAS) detection stations installed and operated at the Hellenic Open University campus. Each station (Astroneu station) combines two different detection technologies. Three charged particle detectors arranged in a triangle and an RF antenna in the middle. Before installation several calibration procedures were performed both to the individual detectors of the array as well as to each integrated Astroneu station. In this paper we present the development of simulation methods, data analysis techniques and experimental procedures, which have been used to calibrate and optimize the operating parameters of the Astroneu particle detectors, to process the experimental signals and extract timing and amplitude information, to correct for systematic biases and estimate precisely the particle-front arrival time on each individual detector resulting to accurate reconstruction of the detected EAS direction. Furthermore, the performance of the Astroneu telescope in detecting and reconstructing EAS is demonstrated with special inter-calibration runs, where pairs of stations are detecting simultaneously the same air shower, as well as with comparisons against the predictions of a detailed simulation description of the detectors

    Detection of high energy showers by the Astroneu extensive air shower array

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    International audience‱ Detailed simulation of the response of scintillator detectors to extensive air showers. ‱ Measurement of the zenith and azimuth distribution of EAS at ground level combining two distant Astroneu stations. ‱ Performance of the Astroneu array

    The Astroneu Extensive Air Shower array

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    International audienceAstroneu is an array of autonomous stations to detect Extensive Air Showers, which is deployed at the Hellenic Open University campus on the outskirts of Patras in western Greece. Currently 9 scintillators detectors and 3 Radio Frequency (RF) antennas have been installed and operated at the site. The detector units are arranged in three autonomous stations each consisting of three scintillator detectors and one RF antenna. We present the hardware components of the array, the online software for the remote control, monitor and Data Acquisition, as well as the offline simulation and reconstruction software. We report also briefly on the performance of the array demonstrating its potential to detect Extensive Air Showers

    Deployment and calibration procedures for accurate timing and directional reconstruction of EAS particle-fronts with HELYCON stations

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    High energy cosmic rays, with energies thousands of times higher than those encountered in particle accelerators, offer scientists the means of investigating the elementary properties of matter. In order to detect high energy cosmic rays, new detection hardware and experimental methods are being developed. In this work, we describe the network of HELYCON (HEllenic LYceum Cosmic Observatories Network) autonomous stations for the detection and directional reconstruction of Extended Atmospheric Showers (EAS) particle-fronts. HELYCON stations are hybrid stations consisting of three large plastic scintillators plus a CODALEMA antenna for the RF detection of EAS particle-fronts. We present the installation, operation and calibration of three HELYCON stations and the electronic components for the remote control, monitor and Data Acquisition. We report on the software package developed for the detailed simulation of the detectors' response and for the stations' operation. The simulation parameters have been fine tuned in order to accurately describe each individual detector's characteristics and the operation of each HELYCON station. Finally, the evaluation of the stations' performance in reconstructing the direction of the EAS particle-front is being presented

    The Hellenic Open University Cosmic Ray Telescope: Research and Educational Activities

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    The Hellenic Open University Cosmic Ray Telescope consists of three autonomous stations installed at the University Campus in the city of Patras. Each station comprises three large (≈ 1 m2) plastic scintillators and one or more Codalema type RF antennas detecting Extensive Air Showers (EAS), originating from primary particles with energy greater than 10 TeV. The operation and the performance of the Telescope is presented briefly, emphasising the educational activities foreseen in the framework of the HEllenic LYceum Cosmic Observatories Network (HELYCON)

    The use of the Micromegas technology for a new imaging system

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    The Micromegas (Micromesh Gaseous) detector technology was developed by I. Giomataris and G. Charpak, in the mid 90s, for applications in the field of experimental Particle Physics. The most recent development is a novel Micromegas detector designed to detect photons of energies 1-10keV (X-ray range), for a discovery experiment of the hypothetical particles called axions, installed and currently taking data at CERN (the European Laboratory for Particle Research in Geneva). This detector has an X-Y readout capability of resolution less than 100ÎŒm, an energy resolution down to 14%, for this energy range, and an overall efficiency of 70%. With planned modifications, similar performances can be achieved for operation in the energy regime of the technetium gammas. This could lead to a novel Îł-ray imaging device with spatial resolution in the submillimeter range. Initial results are presented obtained using the current detector with a parallel hole collimator to image thin capillary phantoms filled with a 99mTc water solution. © 2004 Elsevier B.V. All rights reserved
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