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T: Fachverband Teilchenphysik
T 31: Elektroschwache Wechselwirkung 1
T 31.6: Vortrag
Montag, 9. März 2009, 18:20–18:35, A017
Study of the Missing Energy in the ATLAS detector — •Giovanni Siragusa — Institut für Physik - Johannes Gutenberg Universität. Staudingerweg 7, 55099 - Mainz
A very good measurement of the Missing Transverse Energy (ETmiss) is a crucial requirement for the study of many physics channels at the LHC, for example the Standard Model W or top-quark production, the Higgs bosons decaying to taus or SUSY events. The Missing Energy is, in fact, a very clean signature of new Physics and can be used to trigger efficiently events of interest.
The most important contribution to the ETmiss measurement in the ATLAS detector comes from the calorimeters, which provide near hermetic energy reconstruction. Given the huge number of electronic channels involved, the calorimeter noise suppression is of crucial importance and can be achieved using a simple noise cut or more sophisticated topological criteria (TopoCluster). A refined calibration improves the ETmiss measurement and can be obtained using the calorimeter signal shapes and/or identified particle and jet signals. The measurement includes the contribution from muons and the energy deposit in dead materials and in the calorimeter cryostat.
In this work we present a detailed study of the Missing Energy performance using a data-driven approach based on the study of the W/Z boson decay in the electron channel. In particular, it is possible to use Z→e+e− events with one of the two electrons removed to predict ETmiss in W→eν events. The study has been performed using fully simulated ATLAS data and includes different level of hadronic activity.