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T: Fachverband Teilchenphysik

T 59: Elektroschwache Wechselwirkung I

T 59.5: Vortrag

Mittwoch, 21. März 2018, 17:35–17:50, Z6 - SR 1.005

Reconstruction of the ττ system for Higgs and Z boson property measurements — David Brunner, Jordy Degens, Peter Fackeldey, Olena Hlushchenko, Wolfgang Lohmann, •Johannes Merz, Thomas Müller, Alexander Nehrkorn, Claudia Pistone, Dennis Roy, Hale Sert, Achim Stahl, and Dominik Wolfschläger — III. Physikalisches Institut B, RWTH Aachen University

When reconstructing characteristics of particles decaying into a pair of two τ leptons, the four-momenta need to be accessed. These quantities need to be reconstructed, which poses challenges because of undetectable neutrinos. The currently used algorithm in CMS for the reconstruction of these quantities in H → ττ and Z → ττ events is updated with a new version, where improvements were implemented, e.g. a constraint on the boson mass, which will lead to an improvement in resolution. Comparison studies were performed to evaluate the performance gain and will be presented in this talk. A small outlook on further developments of the algorithm is presented additionally.
Polarisation of τ leptons is a particularly interesting measurement, as it allows to access the weak mixing angle sinθ_W. This requires access to the spin information of the τ leptons, which in turn depends on the ability to reconstruct angular quantities of the τ leptons, which will be provided by the algorithm described above and will make great use of the implemented improvements. The knowledge gained in such a polarisation measurement might also prove fruitfull in a H → τ τ CP analyses.