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T: Fachverband Teilchenphysik
T 124: BSM Higgs 5 (charged Higgs bosons)
T 124.3: Talk
Friday, March 8, 2024, 09:30–09:45, Geb. 30.41: HS 3
Search for a charged Higgs boson decaying to cs in the low mass region with the ATLAS detector at √s=13 TeV — Jochen Dingfelder, Tatjana Lenz, and •Christian Nass — Physikalisches Institut, Universität Bonn, Deutschland
In the Standard Model (SM) electroweak symmetry breaking (EWSB) is introduced by a single complex scalar field. The consequence is the prediction of a scalar, neutrally charged particle, the Higgs boson, which was discovered in 2012 at the LHC. A simple extension of the SM is to introduce EWSB through two complex scalar fields. Such two-Higgs doublet models (2HDM) are attractive because they offer the opportunity to include additional CP violation to the SM, which is needed for explaining baryogenesis. 2HDMs feature 3 neutral and 2 charged Higgs bosons. An observation of such a charged scalar particle would be a striking signal of physics beyond the SM.
In the low mass region, mH± < mt, the dominant production mode is by a tt pair with one t-quark decaying to H± b and the search for H± → cs decays is suggested in several theory papers. This talk presents the search of H± → cs decays in the full Run-2 ATLAS pp-collision dataset. That includes background estimation, signal extraction, and expected as well as observed sensitivities.
Keywords: New Physics; BSM; Charged Higgs; H+