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Jul 26 – 30, 2021
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A 96 GeV Higgs Boson in the 2HDMS

Jul 26, 2021, 4:45 PM


Parallel session talk Searches for New Physics T10: Searches for New Physics


Steven Paasch (FLC (FTX Fachgruppe SLB))


We discuss a ∼ 3 σ signal (local) in the light Higgs-boson search in the diphoton decay
mode at ∼ 96 GeV as reported by CMS, together with a ∼ 2 σ excess (local) in the bb̄
final state at LEP in the same mass range. We interpret this possible signal as a Higgs
boson in the 2 Higgs Doublet Model with an additional complex Higgs singlet (2HDMS).
We find that the lightest CP-even Higgs boson of the 2HDMS type II can perfectly
fit both excesses simultaneously, while the second lightest state is in full agreement
with the Higgs-boson measurements at 125 GeV, and the full Higgs-boson sector is
in agreement with all Higgs exclusion bounds from LEP, the Tevatron and the LHC
as well as other theoretical and experimental constraints. We derive bounds on the
2HDMS Higgs sector from a fit to both excesses and describe how this signal can be
further analyzed at the LHC and at future e⁺e⁻ colliders, such as the ILC. We analyze
in detail the anticipated precision of the coupling measurements of the 96 GeV Higgs
boson at the ILC.

First author Steven Paasch
Collaboration / Activity DESY

Primary authors

Cheng Li (FLC (FTX Fachgruppe SLB)) Steven Paasch (FLC (FTX Fachgruppe SLB)) Gudrid Moortgat-Pick (FLC (Technol. zukuenft. Teilchenph. Experim.)) Sven Heinemeyer (IFCA (CSIC, Santander)) Florian Lika (University of Hamburg)

Presentation materials