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1. Overview of the High-Level Trigger Electron and Photon Selection for the ATLAS Experiment at the LHC

Author

Mello, A Gesualdi, dos Anjos, A, Armstrong, S, Baines, JTM, Bee, CP, Biglictti, M, Bogaerts, JA, Bosman, M, Caron, B, Casado, P, Cataldi, G, Cavalli, D, Comune, G, Muiño, P Conde, Crone, G, Damazio, D, De Santo, A, Gomez, M Diaz, Di Mattia, A, Ellis, N, Emelivanov, D, Epp, B, Falciano, S, Garitaonandia, H, George, S, Ghete, V, Goncalo, R, Haller, J, Kabana, S, Khomich, A, Kilvington, G, Kirkc, J, Konstantinidis, N, Kootz, A, Lankford, AJ, Lowe, A, Luminari, L, Maeno, T, Masik, J, Meessen, C, Moore, R, Morettini, P, Negri, A, Nikitin, N, Nisati, A, Osuna, C, Padilla, C, Panikashvili, N, Parodi, F, Pasqualucci, E, Reale, V Perez, Pinfold, JL, Pinto, P, Oian, Z, Resconi, S, Rosati, S, Sanchez, C, Santamarina, C, Scannicchio, DA, Schiavi, C, Segura, E, de Seixas, JM, Sivoklokov, S, Sobreira, A, Soluk, R, Stefanidis, E, Sushkov, S, Sutton, M, Tapprogge, S, Tarem, S, Thomas, E, Touchard, F, Usaib, G, Pintoc, B Venda, Wickens, FJ, Wiedenmann, W, Ventura, A, Vercesi, V, Wengler, T, Werner, P, Wheeler, SJ, Wielers, M, and Zobernig, G

Abstract

The ATLAS experiment at the Large Hadron Collider (LHC) will face the challenge of efficiently selecting interesting candidate events in pp collisions at 14 TeV center-of-mass energy, whilst rejecting the enormous number of background events. The High-Level Trigger (HLT = second level trigger and Event Filter), which is a software based trigger will need to reduce the level-1 output rate of ≈ 75 kHz to ≈ 200 Hz written out to mass storage. In this talk an overview of the current physics and system performance of the HLT selection for electrons and photons is given. The performance has been evaluated using Monte Carlo simulations and has been partly demonstrated in the ATLAS testbeam in 2004. The efficiency for the signal channels, the rate expected for the selection, the global data preparation and execution times will be highlighted. Furthermore, some physics examples will be discussed to demonstrate that the triggers are well adapted for the physics programme envisaged at the LHC. © 2005 IEEE.

Published
2005

2. Muon Identification with the Event Filter of the ATLAS Experiment at CERN LHC's

Author

Cataldi, Gabriella, dos Anjos, A, Armstrong, S, Baines, JTM, Bee, CP, Biglietti, M, Bozaerts, JA, Bosman, M, Carlino, G, Caron, B, Casado, P, Cataldi, G, Cavalli, D, Comune, G, Conde, P, Conventi, F, Crone, G, Damazio, D, De Santo, A, Gomez, M Diaz, Di Mattia, A, Ellis, N, Emeliyanov, D, Eon, B, Falciano, S, Garitaonandia, H, George, S, Ghete, V, Goncalo, R, Gorini, E, Haller, J, Kabana, S, Khomich, A, Kilvinaton, G, Kirk, N, Konstantinidis, N, Kootz, A, Lankford, AJ, Lowe, A, Luminari, L, Maeno, T, Masik, T, Meessen, C, Mello, AG, Moore, R, Morettini, P, Negri, A, Nikitin, N, Nisati, A, Osuna, C, Padilla, C, Panikashvili, N, Parodi, F, Reale, V Perez, Pinfold, JL, Pinto, P, Primavera, M, Oian, Z, Resconi, S, Rosati, S, Sanchez, C, Santamarina, C, Scannicchio, DA, Schiavi, C, Segura, E, de Seixas, JM, Sivoklokov, S, Soluk, R, Spagnolo, S, Stefanidis, E, Sushkov, S, Sutton, M, Tannroaae, S, Tarem, S, Thomas, E, Touchard, F, Usai, G, Pinto, B Venda, Ventura, A, Vercesi, V, Wengler, T, Werner, P, Wheeler, SJ, Wickens, FJ, Wiedenmann, W, Wielers, M, and Zobernia, G

Abstract

The Large Hadron Collider at CERN offers unprecedented challenges to the design and construction of detectors and trigger/data acquisition systems. For ATLAS, a three level trigger system has been developed to extract interesting physics signatures with a 106 rate reduction. To accomplish this, components of physics analysis traditionally deferred to offline physics analysis must be embedded within the online trigger system. For the Muon trigger, the specific off-line algorithms MOORE (Muon Object Oriented REconstruction) and MuId (Muon Iden tification) have been adopted so far for the on-line use, imposing an operation in a Bayesian-like environment where only specific hypotheses must be validated. After a short review of the ATLAS trigger, the paper shows the general strategy of the Muon Identification and Selection accessing the full event data, or being seeded from results derived at a previous stage of the trigger chain. © 2005 IEEE.

Published
2005

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