1655743
A distributed, Grid-based analysis system for the MAGIC telescope
The observation of high-energetic γ-rays with ground based air cerenkov telescopes is one of the most exciting areas in modern astro particle physics giving insight into active galactic nuclei (AGN), pulsars, supernova remnants, unidentified EGRET sources, γ-ray bursts and cosmology. The MAGIC telescope started operation at the end of 2003. The low energy threshold for γ-rays together with different background sources leads to a considerable amount of data. The data analysis will be done in different institutes spread across Europe. The production of Monte Carlo events including the simulation of Cerenkov light in the atmosphere is very computing intensive and another challenge for a collaboration like MAGIC. The current Grid technology widely deployed over 80 sites by LCG has recently proven to be mature and well adapted to set up a distributed computational and data intensive analysis system meeting the requirements of experiments like MAGIC. The basic architecture of such a distributed, Europe wide Grid system will be presented. First implementation results will be shown. This Grid might be the starting point for a wider distributed astro particle Grid in Europe.
118178926
GRID SERVICES FOR THE MAGIC EXPERIMENT
Exploring signals from the outer space has become an observational science under fast expansion. On the basis of its advanced technology the MAGIC telescope is the natural building block for the first large scale ground based high energy gamma-ray observatory. The low energy threshold for gamma-rays together with different background sources leads to a considerable amount of data. The analysis will be done in different institutes spread over Europe. Therefore MAGIC offers the opportunity to use the Grid technology to setup a distributed computational and data intensive analysis system with the nowadays available technology. Benefits of Grid computing for the MAGIC telescope are presented.
122811596
A High Resolution Search for the Tensor Glueball Candidate ξ(2230)
Abstract We report results of a high resolution search for the tensor glueball candidate ξ (2230) in a p p formation experiment. π 0 π 0 and ηη decay channels were measured in a scan of the mass region 2220 MeV to 2240 MeV. No evidence for the existence of ξ (2230) was found. 95% confidence upper limits for the possible existence of ξ are presented.
122322573
New states as observed by the Crystal Barrel experiment
Abstract The Crystal Barrel Detector has been in operation since October 1989. Results on the analysis of the annihilation of protonium at rest into three pseudoscalars is presented. The π 0 π 0 π 0 final state confirms the existence of ƒ 2 (1520)→π 0 π 0 . In the ηη system of the π 0 ηη final state an isoscalar J PC = 0 ++ resonance with a mass of 1560 MeV/c 2 and a width of 245 MeV/c 2 is observed. The identification with ƒ 0 (1590) is doubtful since the ηη' decay is not observed with the corresponding strength. Our analysis yields an upper limit for the relative branching ratio BR(ƒ 0 (1560)→ηη') BR(ƒ 0 (1560)→ηη) .
123370608
Computing technology and environment for physics research
Over the past year a remarkable progress in computing technology and environment for physics research has been achieved. This article tries to summarize the contributions to the field as presented in the course of the ACAT2003 conference.
53706779
Spectroscopy of Light Quark Systems
Thi s article i s part of a proposal for the construction of a high intensity proto~ accelerator in Europe (EHF, Proposal for a European Hadron Facility, edited by J.F.Crawford (SIN), supported by BMFT (Germany) and INFN (Italy)). Experiments concerning the spectroscopy of light Quark systems are discussed, which can be performed wi th Kaon beams of high intensi ty and high purity at EHF. After abrief review of the status of Mesonand Baryonspectroscopy an optimized detection system is presented, and two specific experiments (Glue-Ball production with Kbeams; radiative decays of the A(1405)-resonance) are discussed in detail. A Monte-Carlo-simulation shows, that clear signals for these processes can be obtained in short measuring times. These examples demonstrate, that wi th high quali ty Kbeams new and important information on Hadron-spectroscopy can be obtained, which is important for a further understanding of Quantum-Chromo-Dynamics.
53967767
Existence of Axially Symmetric Static Solutions of the Einstein-Vlasov System
We prove the existence of static, asymptotically flat non-vacuum spacetimes with axial symmetry where the matter is modeled as a collisionless gas. The axially symmetric solutions of the resulting Einstein-Vlasov system are obtained via the implicit function theorem by perturbing off a suitable spherically symmetric steady state of the Vlasov-Poisson system.
16238417
Gravitational collapse and the formation of black holes for the spherically symmetric Einstein-Vlasov system
We review results on the spherically symmetric, asymptotically flat Einstein-Vlasov system. We focus on a recent result where we found explicit conditions on the initial data which guarantee the formation of a black hole in the evolution. Among these data there are data such that the corresponding solutions exist globally in Schwarzschild coordinates. We put these results into a more general context, and we include arguments which show that the spacetimes we obtain satisfy the weak cosmic censorship conjecture and contain a black hole in the sense of suitable mathematical definitions of these concepts which are available in the literature.
6557807
Global Existence for the Spherically Symmetric Einstein–Vlasov System with Outgoing Matter
We prove a new global existence result for the asymptotically flat, spherically symmetric Einstein–Vlasov system which describes in the framework of general relativity an ensemble of particles which interact by gravity. The data are such that initially all the particles are moving radially outward and that this property can be bootstrapped. The resulting non-vacuum spacetime is future geodesically complete.
7205471
Multipole Radiation in a Collisionless Gas Coupled to Electromagnetism or Scalar Gravitation
We consider the relativistic Vlasov-Maxwell and Vlasov-Nordström systems which describe large particle ensembles interacting by either electromagnetic fields or a relativistic scalar gravity model. For both systems we derive a radiation formula analogous to the Einstein quadrupole formula in general relativity.