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T: Fachverband Teilchenphysik
T 83: Search for new particles IV
T 83.9: Vortrag
Donnerstag, 2. April 2020, 18:30–18:45, L-2.017
Search for high-mass resonances decaying to τν in pp-colisions at √s=13 TeV with the ATLAS detector — •Christos Vergis and Jochen Christian Dingfelder for the ATLAS collaboration — Physikalisches Institut, Bonn, Germany
Many models beyond the Standard Model predict the existence of new heavy charged gauge bosons (W′). In case of leptonic W′ decays, the signature in the detector is a high-pT lepton and large missing energy from the undetected neutrino. Although searches for W′→ (e/µ)ν are more sensitive than W′→τν for universal coupling to leptons, decays to tau lepton are well suited for models in which the W′ couples preferentially to the third-generation of fermions.
This talk will cover the search for heavy resonances decaying to a tau and a neutrino, in events where the tau lepton decays hadronically, using data collected during the 2015-2018 pp-collisions at √s=13 TeV by the ATLAS detector at the LHC. Recent updates to the background estimation and analysis strategy will be discussed. Preliminary expected exclusion limits to the W′ masses in the Sequential Standard Model (as benchmark model) and models with preferential couplings to the third generation of fermions will be shown. Following the increase in luminosity as well as upgrades in the tau reconstruction algorithms and analysis strategy, the reach of the search is significantly improved compared to the first ATLAS results.