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Implementation And Performance of the ATLAS Second Level Jet Trigger

Description: ATLAS is one of the four major LHC experiments, designed to cover a wide range of physics topics. In order to cope with a rate of 40MHz and 25 interactions per bunch crossing, the ATLAS trigger system is divided in three different levels. The jet selection starts at first level with dedicated processors that search for high E{sub T} hadronic energy depositions. At the LVL2, the jet signatures are verified with the execution of a dedicated, fast jet reconstruction algorithm, followed by a calibr… more
Date: November 9, 2011
Creator: Conde Muino, Patricia; Aracena, I.; Brelier, B.; Cranmer, K.; Delsart, P. A.; Dufour, M. A. et al.
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Partner: UNT Libraries Government Documents Department
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Fast Shower Simulation in the ATLAS Calorimeter

Description: The time to simulate pp collisions in the ATLAS detector is largely dominated by the showering of electromagnetic particles in the heavy parts of the detector, especially the electromagnetic barrel and endcap calorimeters. Two procedures have been developed to accelerate the processing time of electromagnetic particles in these regions: (1) a fast shower parameterisation and (2) a frozen shower library. Both work by generating the response of the calorimeter to electrons and positrons with Gean… more
Date: November 8, 2011
Creator: Barberio, E.; Boudreau, J.; Butler, B.; Cheung, S. L.; Dell'Acqua, A.; Di Simone, A. et al.
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Partner: UNT Libraries Government Documents Department
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Fast Simulation of Electromagnetic Showers in the ATLAS Calorimeter: Frozen Showers

Description: One of the most time consuming process simulating pp interactions in the ATLAS detector at LHC is the simulation of electromagnetic showers in the calorimeter. In order to speed up the event simulation several parametrisation methods are available in ATLAS. In this paper we present a short description of a frozen shower technique, together with some recent benchmarks and comparison with full simulation. An expected high rate of proton-proton collisions in ATLAS detector at LHC requires large sa… more
Date: November 29, 2011
Creator: Barberio, E.; Boudreau, J.; Butler, B.; Cheung, S. L.; Dell'Acqua, A.; Di Simone, A. et al.
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Partner: UNT Libraries Government Documents Department
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A Barrel IFR Instrumented With Limited Streamer Tubes for BABAR Experiment

Description: The new barrel Instrumented Flux Return (IFR) of BABAR detector will be reported here. Limited Streamer Tubes (LSTs) have been chosen to replace the existing RPCs as active elements of the barrel IFR. The layout of the new detector will be discussed: in particular, a cell bigger than the standard one has been used to improve efficiency and reliability. The extruded profile is coated with a resistive layer of graphite having a typical surface resistivity between 0.2 and 0.4 MOhm/square. The tube… more
Date: November 15, 2006
Creator: Andreotti, M.
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Partner: UNT Libraries Government Documents Department
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Implementation and Performance of the Tau Trigger in the ATLAS Experiment

Description: Triggering on hadronic taus at the LHC is a difficult task due to the high rate and occupancy of the events. On the other hand, the tau trigger increases the discovery potential of ATLAS in many physics channels, among others the Standard Model or SuperSymmetric Higgs (charged or neutrals) production. In order to cope with the rate and optimize the efficiency on important physics channels, the results of the current simulation studies indicate that the ATLAS tau trigger should be used either wi… more
Date: November 15, 2011
Creator: Bosman, M.; Casado, P.; /Barcelona, IFAE; Dam, M.; U., /Copenhagen; Demers, S. et al.
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Partner: UNT Libraries Government Documents Department
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Detector Noise Susceptibility Issues for the Future Generation of High Energy Physics Experiments

Description: The front-end electronics (FEE) noise characterization to electromagnetic interference and the compatibility of the different subsystems are important topics to consider for the LHC calorimeter upgrades. A new power distribution scheme based on switching power converters is under study and will define a noticeable noise source very close to the detector's FEE. Knowledge and experience with both FFE noise and electromagnetic compatibility (EMC) issues from previous detectors are important condit… more
Date: November 22, 2011
Creator: Arteche, F.; Esteban, C.; Iglesias, M.; Rivetta, C. & Arcega, F. J.
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Partner: UNT Libraries Government Documents Department
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Isolated Attosecond Pulses using a Detuned Second-harmonic Field

Description: Calculations are presented for the generation of an isolated attosecond pulse in a multicycle two-color strong-field regime. We show that the recollision of the electron wave packet can be confined to half an optical cycle using pulses of up to 40 fs in duration. The scheme is proven to be efficient using two intense beams, one producing a strong field at {omega} and the other a strong field detuned from 2{omega}. The slight detuning {delta}{omega} of the second harmonic is used to break the sy… more
Date: November 7, 2007
Creator: Merdji, Hamed; /Saclay /SLAC, PULSE; Auguste, Thierry; Boutu, Willem; Caumes, J.-Pascal; Carre, Bertrand et al.
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Partner: UNT Libraries Government Documents Department
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Experience With the Resistive Plate Chamber in the BaBar Experiment

Description: The BABAR detector has operated nearly 200 Resistive Plate Chambers (RPCs), constructed as part of an upgrade of the forward endcap muon detector, for the past two years. The RPCs experience widely different background and luminosity-driven singles rates (0.01-10 Hz/cm{sup 2}) depending on position within the endcap. Some regions have integrated over 0.3 C/cm{sup 2}. RPC efficiency measured with cosmic rays and beam is high and stable. However, a few of the highest rate RPCs have suffered effic… more
Date: November 15, 2006
Creator: Bellini, F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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