3,281 research outputs found

    Higgs at the LHC

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    We review the Higgs physics prospects of the ATLAS and CMS experiments at the LH

    Power mezzanine PDB-LTM: Status of the boards production

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    A second problem is due to errors in \u201c populating\u201d the board. Some components, labelled as \uabDNP (Do Not Mount) were mounted by the assembler Please note that the manufacturer is the same of all previous versions! \u2026\u2026 he did not read instruction?? We had to remove all not-wanted components. Almost Solved! Only one problem is still present on the boards

    PDB issues and Production Plan

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    8 PDB pre\u2010production boards (version 3) received in Milano end of February Differences between version 3 and previous version (version 2): 1. Different values of some resistors in order to optimize a few output voltages as requested by Hao after some tests of PDB v2 in the LTDB 2. Some geometrical changes implemented in the frame Of the 8 pre\u2010production PDBS: \u2022 4 boards were not useable because of a mistake made by the manufacturer (problem understood \u2013 see March Lar week presentation https://indico.cern.ch/event/800559/contributions/3339352/attachments/1806520/2948521/PDB\u2010LTM_2019\u201003\u201005.pdf ) \u2022 4 boards were successfully tested in Milano and 3 of them were sent to BNL During the tests in BNL, a start up sequence not correct in some situation was observed. The problem could not be reproduced in Milano with the other v3 board. Moreover the problem was not observed with v2 boards (neither in Milano nor in BNL) Investigation on this issue started and the problem was traced to dependencies on the LVPS used in the tests. Milano had used always the same LVPS in the tests, BNL used not only the Wiener LVPS but also other devices (Vicor and Keysight). Moreover the input capacitors of the LTDB were changed to be compatible with 48 V input voltage for Phase II: \u2013 to be compatible with the footprint in the LTDB layout the capacitance was slightly reduced

    Position resolution and particle identification with the ATLAS EM calorimeter

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    In the years between 2000 and 2002 several pre-series and series modules of the ATLAS EM barrel and end-cap calorimeter were exposed to electron, photon and pion beams. The performance of the calorimeter with respect to its finely segmented first sampling has been studied. The polar angle resolution has been found to be in the range 50-60 mrad/sqrt(E (GeV)). The neutral pion rejection has been measured to be about 3.5 for 90% photon selection efficiency at pT=50 GeV/c. Electron-pion separation studies have indicated that a pion fake rate of (0.07-0.5)% can be achieved while maintaining 90% electron identification efficiency for energies up to 40 GeV.Comment: 32 pages, 22 figures, to be published in NIM
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