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Würzburg 2018 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 51: Suche nach Physik jenseits des Standardmodels III

T 51.10: Vortrag

Mittwoch, 21. März 2018, 18:50–19:05, Philo-HS4

A search for high-mass resonances decay to τν in pp-collisions at s=13 TeV with the ATLAS detector — •Christos Vergis, Will Davey, and Jochen Dingfelder — Physikalisches Institut, Universität Bonn, Germany

Many models beyond the Standard Model predict the existence of new heavy charged (W) gauge bosons. In case of leptonic W decays, the signature is a high-pT lepton and large missing energy from the emitted neutrino. Although searches for We/µ 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 third-generation fermions.

The search for heavy resonances decaying to a tau lepton and a neutrino is performed in events where the tau lepton decays hadronically, using 36.1 fb−1 of pp-collision data at √s=13 TeV recorded by the ATLAS detector at the LHC. This is the first search for W bosons in this decay channel from ATLAS. No significant excess of events over the Standard Model expectation was found and 95% CL upper limits are set on the visible τν production cross section, σ(pp→τν+X) · B· A · є. W bosons with masses below 3.74 TeV (SSM) and 2.1-3.76 TeV (non-universal models) are excluded, significantly improving the limits set by other searches for new gauge bosons with non-universal couplings.

In this talk, an overview of the W′→τν analysis and the current results will be given.

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