Heidelberg 2022 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 62: Higgs Boson: Extended Models 2
T 62.3: Vortrag
Mittwoch, 23. März 2022, 16:45–17:00, T-H21
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 at the LHC 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 in the SM, which is needed for explaining baryogenesis. 2HDMs feature 3 neutral and 2 charged Higgs bosons. Observation of such a charged scalar would be a striking signal for physics beyond the SM.
In the low mass region, i.e. mH± < mt, the dominant production mode is by a tt pair with one t-quark decaying to H± b. At low masses, the search for H± → cs decays is promising, as suggested in several theory papers. This talk will present background estimates, data-driven MC corrections and usage of c-tagging to define signal enriched and depleted regions as well as the first estimate of the expected sensitivity for the H± → cs search with the full Run-2 ATLAS dataset recorded at a center-of-mass energy of 13 TeV.