--- UserCode/Friis/TancNote/note/abstract.tex 2010/03/17 20:01:25 1.1 +++ UserCode/Friis/TancNote/note/abstract.tex 2010/03/31 01:22:23 1.2 @@ -1,11 +1,23 @@ -Due to the low signal rates for many new physics scenarios and large QCD -backgrounds, efficiently identifying tau leptons while maintaining an extremely -low mis-tag rate will be an important part of the CMS physics program. The CMS -particle flow algorithm combines all sub-detectors to provide a global -reconstruction of a collision event and potentially improves spatial and energy -resolution. Using the reconstructed objects from particle flow, an algorithm -using an ensemble of neural nets corresponding to different tau decay -resonances has been developed. This algorithm provides a large performance -improvement with respect to previous CMS tau identification strategies and can -potentially increase the reach of many CMS searches for physics beyond the -Standard Model. Preliminary results are presented in this summary. +%Due to the low signal rates for many new physics scenarios and large QCD +%backgrounds, efficiently identifying tau leptons while maintaining an extremely +%low mis-tag rate will be an important part of the CMS physics program. The CMS +%particle flow algorithm combines all sub-detectors to provide a global +%reconstruction of a collision event and potentially improves spatial and energy +%resolution. A new algorithm for identifying hadronic tau decays, the Tau Neural +%Classifier (TaNC) is presented in this paper. Using the reconstructed objects +%from particle flow, the algorithm reconstructs the hadronic decay of the tau +%lepton and uses an ensemble of neural nets to discriminate against common +%background. This strategy provides a large performance improvement with respect +%to previous CMS tau identification strategies and can potentially increase the +%reach of many CMS searches for physics beyond the Standard Model. A technical +%description of the algorithm and measurements of performance are included. + +The Tau Neural Classifier (TaNC) is a novel algorithm for identification of +hadronic tau decays. The algorithm includes two components, the reconstruction +of tau lepton hadronic decay modes and discrimination of tau lepton hadronic +decays from quark and gluon jets. The reconstruction of decay modes is based +on the reconstruction of individual charged hadrons and photons by the +particle--flow algorithm and is utilized in the discrimination to train a set +of neural networks using input variables that are sensitive to particular decay +modes. We observe a significant improvement in identification performance in +comparison to previous algorithms.