1,602 research outputs found
Simulation of Cherenkov Contamination for Cosmic-Ray Showers Observed with the Auger Fluorescence Telescopes
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Observation of a J^PC = 1⁺⁻ Exotic Signal in the π°π°π° System Diffractively Produced at COMPASS and Comparison to the Charged Decay Mode
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COMPASS Calorimetry in view of future plans
No full textThe COMPASS experiment at the CERN SPS is dedicated to hadron physics with a broad research programme, including the study of the nucleon spin structure using muons as a probe and a variety of issues in meson spectroscopy using hadron beams. The two stage fixed target spectrometer with electromagnetic (em) and hadronic calorimetry in both stages provides photon detection in a wide angular range. As discussed in this paper, the COMPASS em calorimetry plays a crucial r\^{o}le for the Hadron programme started in 2008 as well as for the planned COMPASS future programme of measuring GPDs via exclusive DVCS photons. We present the photon detection coverage foreseen, and first, preliminary results characterising the present performances of both existing COMPASS electromagnetic calorimeters, based on test beam data taken at CERN T9 facility end of 2007.The COMPASS experiment at the CERN SPS is dedicated to hadron physics with a broad research programme, including the study of the nucleon spin structure using muons as a probe and a variety of issues in meson spectroscopy using hadron beams. The two stage fixed target spectrometer with electromagnetic (em) and hadronic calorimetry in both stages provides photon detection in a wide angular range. As discussed in this paper, the COMPASS em calorimetry plays a crucial r\^{o}le for the Hadron programme started in 2008 as well as for the planned COMPASS future programme of measuring GPDs via exclusive DVCS photons. We present the photon detection coverage foreseen, and first, preliminary results characterising the present performances of both existing COMPASS electromagnetic calorimeters, based on test beam data taken at CERN T9 facility end of 2007
On the disputed resonance and observation of a new iso-vector resonance
No full textThe COMPASS experiment at CERN delivers new results on the search for exotic mesons. A spin-exotic resonance, the , was reported by several experiments in the past. Those observations are, however, still to date highly disputed in the community. Especially the decay channel allows for simultaneous observation of well established and less known resonances in different decay modes. The results from amplitude analysis of diffractively produced final states show consistently a spin-exotic signal, that appears in agreement with previous observations of the . The high-statistics 2008 data sample allows and demands for an extended amplitude analysis method that further disentangles resonant and non-resonant particle production. The present status of analysis of COMPASS data and the observation of a new iso-vector meson is discussed.The COMPASS experiment at CERN delivers new results on the search for exotic mesons. A spin-exotic resonance, the , was reported by several experiments in the past. Those observations are, however, still to date highly disputed in the community. Especially the decay channel allows for simultaneous observation of well established and less known resonances in different decay modes. The results from amplitude analysis of diffractively produced final states show consistently a spin-exotic signal, that appears in agreement with previous observations of the . The high-statistics 2008 data sample allows and demands for an extended amplitude analysis method that further disentangles resonant and non-resonant particle production. The present status of analysis of COMPASS data and the observation of a new iso-vector meson is discussed
ASPECTS OF THE RECONSTRUCTION CHAIN FOR THE FLUORESCENCE TELESCOPES OF THE PIERRE AUGER OBSERVATORY
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