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Würzburg, Germany

Messi F.,Physikalisches Institute
Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment | Year: 2013

The BGO-OD experiment is intended for the systematic investigation of the photo-production of mesons off the nucleon. The experiment will use bremsstrahlung photons from an e- beam incident upon a thin radiator. The photon energy will be measured via the deflection of the electrons in the magnetic field of a photon tagger. The B-FrED is a 16 channel double-threshold discriminator and shaper board designed as Front-End Electronics for the newTagger detector of the experiment. It is a 6U-VME form factor card.The analog input stage has 1.7 GHz bandwidth. The output stage provides two LVDS signals with an expected jitter of ∼ 8 ps with respect to the input signal. The threshold settings are managed by a micro-controller which is remotely accessible through Ethernet. © 2012 Elsevier B.V.All rights reserved. Source


Busch O.,Physikalisches Institute
Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment | Year: 2013

The ALICE Transition Radiation Detector (TRD) is one of the largest TRDs ever built. The TRD Detector Controls (DCS) System was conceived to maintain safe detector conditions and allow failsafe, reliable and consistent operation of such a highly complex detector. We present the design and implementation of TRD DCS with emphasis on practical aspects of detector operation at the Large Hadron Collider. © 2012 CERN. Published by Elsevier B.V. All rights reserve. Source


Dreiner H.K.,Physikalisches Institute | Kim J.S.,University of Adelaide | Lebedev O.,German Electron Synchrotron
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2012

The ATLAS and CMS Collaborations have recently reported tantalizing hints of the existence of a 125 GeV Higgs-like particle, whose couplings appear to match well the Standard Model (SM) expectations. In this work, we study implications of this observation for the neutralino sector of supersymmetric models, assuming that the Higgs signal gets confirmed. In general, the Higgs decay into neutralinos can be one of its dominant decay channels. Since a large invisible Higgs decay branching ratio would be in conflict with the data, this possibility is now constrained. In particular, we find that most of the region μ<170 GeV, M 1<70 GeV at tanβ~10 and μ<120 GeV, M 1<70 GeV at tanβ~40 is disfavored. © 2012 Elsevier B.V. Source


Eger P.A.,Physikalisches Institute
Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment | Year: 2012

The H.E.S.S. array of Imaging Atmospheric Cherenkov Telescopes continues to observe the southern sky with unprecedented sensitivity at very-high-energy (VHE, E>100GeV) γ-rays. This leads to a steady increase in the number of detected VHE γ-ray sources as well as the discovery of sources with fluxes even below 1% of the flux of the Crab nebula. Up to now, well more than 100 VHE γ-ray sources are known, which allow to study not only individual objects, but also whole populations of source classes, such as pulsar wind nebulae (PWNe) and shell-type supernova remnants (SNRs). This paper focuses on Galactic sources, highlighting some aspects of the recent progress in this field. After discussing the general status and the future of the H.E.S.S. Galactic Plane survey, four individual sources related to recent discoveries are presented in detail in this contribution: (a) the PWNe HESS J1825-137 and HESS J1303-631 which show intriguing energy-dependent morphologies, (b) the formerly unidentified source HESS J1626-490 which is most likely associated to a molecular cloud illuminated with hadronic cosmic rays by a nearby SNR, and (c) Terzan 5 which is the first Galactic globular cluster that features a VHE γ-ray source in direct vicinity. © 2012 Elsevier B.V. Source


Jakobs K.,Physikalisches Institute
Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment | Year: 2011

Over the coming years the experiments at the Large Hadron Collider (LHC) will explore the TeV energy scale and will most likely answer fundamental questions of particle physics. In the focus of the experiments are the search for physics beyond the Standard Model and the investigation of the nature of electroweak symmetry breaking. In order to fully exploit the physics potential of the LHC facility a high luminosity upgrade with luminosities of 10 35 cm-2 s-1 is envisaged. In the present article the physics potential of the LHC is summarized. For various physics scenarios it is also discussed how an upgraded high luminosity collider, the so called super-LHC (sLHC), could extend the physics reach of the LHC. © 2010 Elsevier B.V. Source

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