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| CMS-PAS-NPS-25-002 | ||
| Search for pair production of additional neutral scalars within the Inert Doublet Model in a final state with two electrons or two muons | ||
| CMS Collaboration | ||
| 2026-03-14 | ||
| Abstract: A search for pair production of new scalars predicted by the Inert Doublet Model is performed using proton-proton collisions collected with the CMS detector at the CERN LHC at $ \sqrt{s}= $13 and 13.6 TeV, corresponding to integrated luminosities of 138 and 35 fb$ ^{-1} $, respectively. Within this model, four additional scalar bosons (H, A, H$ ^{+} $, H$ ^{-} $) are predicted, and because of an additional discrete symmetry, the lightest new scalar, H, is stable, rendering it a viable dark matter candidate. The target final state consists of exactly two opposite-charge same-flavour leptons (electrons or muons), with very little hadronic activity, and missing transverse momentum due to the stable neutral scalars. A parameterised neural network is used to separate the signal from the standard model background. No significant excess of events is observed. Exclusion limits at 95% confidence level are set on the production cross section of the two new neutral scalars, H and A, expressed in terms of their masses, $ m_{\mathrm{H}} $ and $ m_{\mathrm{A}} $, in the $ m_{\mathrm{H}} $ vs. $ m_{\mathrm{A}}-m_\mathrm{H} $ plane. The observed (expected) exclusion region reaches $ m_{\mathrm{H}}=108 (106) $ GeV for $ m_{\mathrm{A}}-m_\mathrm{H}=78 (76) $ GeV and at $ m_{\mathrm{H}}= $ 60 GeV, covers the range of $ m_{\mathrm{A}}-m_\mathrm{H}= $35--90 (32--90) GeV. | ||
| Links: CDS record (PDF) ; CADI line (restricted) ; | ||
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Compact Muon Solenoid LHC, CERN |
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