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Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 59: Extended Higgs models II

T 59.6: Talk

Wednesday, March 17, 2021, 17:15–17:30, Ti

A 96 GeV Higgs Boson in the 2HDMS — •Cheng Li1,2, Steven Paasch1,2, Gudrid Moortgat-Pick1,2, and Sven Heinemeyer3,4,51DESY, Notkestrasse 85, 22607 Hamburg, Germany — 2II. Institut für Theoretische Physik, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany — 3Instituto de Física Teórica (UAM/CSIC), Universidad Autónoma de Madrid, Cantoblanco, 28049, Madrid, Spain — 4Campus of International Excellence UAM+CSIC, Cantoblanco, 28049, Madrid, Spain — 5Instituto de Física de Cantabria (CSIC-UC), 39005, Santander, Spain

CMS reported a ∼3σ excess at ∼96 GeV in the ppH→γγ channel. In the same mass range a ∼2σ excess in the e+eZH, Hbb channel has been reported at LEP as well. We interpret the experimental excesses as the lightest Higgs boson in the Two-Higgs-Doublet Model with a complex singlet (2HDMS) with type II Yukawa structure. We demonstrate the the model can fit both excess simultaneously, while being in agreement with all other existing theoretical and experimental constraints. In this talk, we will present the scan of parameter space of 2HDMS and discuss the "best fit" points from the scan. Furthermore, we will also study the experimental uncertainties of specific Higgs couplings that can be obtained at the future International Linear Collider (ILC) with 250 GeV center-of-mass energy.

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