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T: Fachverband Teilchenphysik

T 81: BSM Suchen V (Leptoquarks und exotische top-Quarks)

T 81.7: Vortrag

Mittwoch, 2. März 2016, 18:15–18:30, VMP9 SR 28

Search for tb resonances with the ATLAS detector at the LHC — •Geoffrey Gilles for the ATLAS Pixel collaboration — Bergische Universität Wuppertal, Wuppertal, Germany

Despite the success of the Standard Model (SM) all along the last fifty years, conceptual limitations do not allow it to answer to some theoretical questions or justify certain experimental observations. These elements let us think that the SM would be only an approximation at low energy of a more fundamental theory. The challenge of particle physics is to search for new phenomena at high-energy not included in the SM. The unique properties of the top quark make it an outstanding tool to probe new dynamics beyond the SM, where it should play a key role, especially by coupling to new heavy resonances.

This presentation will report on searches for new heavy charged vector or scalar bosons, usually called W′ and H⁺, decaying into a top and a bottom quark through effective coupling approaches, in lepton plus jets final states. These searches are performed with 20.3 fb⁻¹ of proton collision data, produced by the LHC at Run I, at a center-of-mass energy of 8 TeV and collected by the ATLAS detector in 2012. This talk intends to present the analysis strategy using multivariate techniques based on boosted decision trees to search for an excess of W′ or H⁺ signal processes in the recorded data, and the statistical analysis performed to extract exclusion limits on the mass, the production cross section or the effective couplings of these particles. It will finally conclude on the perspectives of these searches at the LHC Run II.