A first dedicated search for pair production of new scalars predicted by the Inert Doublet Model is performed using proton-proton collisions. Data were collected with the CMS detector at the CERN LHC at √s = 13 TeV and 13.6 TeV, corresponding to integrated luminosities of 138 fb⁻1 and 35 fb⁻1, respectively. Within this model, four additional scalar bosons (H, A, H⁺, and H⁻) are predicted. Through an additional discrete symmetry, the lightest new scalar, H, is stable, rendering it a viable dark matter candidate. These candidates can originate from quark-antiquark annihilation producing an offshell Z boson that decays to a pair of the new scalars. The target final state consists of exactly two opposite-charge same-flavour leptons (electrons or muons), with missing transverse momentum due to the stable neutral scalars, and very little hadronic activity. 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, mH and mA, in the mH vs. mA - mH plane. The observed (expected) exclusion region reaches mH = 108 (106) GeV for mA - mH = 78 (76) GeV and at mH = 70 GeV, covers the range of mA - mH = 40-90 (35-90) GeV.

Search for pair production of additional neutral scalars within the Inert Doublet Model in a final state with two electrons or two muons in proton-proton collisions at √s = 13 TeV and 13.6 TeV

Abbrescia, M.;Barbieri, M.;Buonsante, M.;Colaleo, A.;De Palma, M.;Elmetenawee, W.;Generoso, L.;Louka, M.;Mastrapasqua, V.;My, S.;Nenna, F.;Nuzzo, S.;Pellecchia, A.;Pompili, A.;Radogna, R.;Stamerra, A.;Troiano, D.;Venditti, R.;Zaza, A.;D'Anzi, B.;
2026-01-01

Abstract

A first dedicated search for pair production of new scalars predicted by the Inert Doublet Model is performed using proton-proton collisions. Data were collected with the CMS detector at the CERN LHC at √s = 13 TeV and 13.6 TeV, corresponding to integrated luminosities of 138 fb⁻1 and 35 fb⁻1, respectively. Within this model, four additional scalar bosons (H, A, H⁺, and H⁻) are predicted. Through an additional discrete symmetry, the lightest new scalar, H, is stable, rendering it a viable dark matter candidate. These candidates can originate from quark-antiquark annihilation producing an offshell Z boson that decays to a pair of the new scalars. The target final state consists of exactly two opposite-charge same-flavour leptons (electrons or muons), with missing transverse momentum due to the stable neutral scalars, and very little hadronic activity. 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, mH and mA, in the mH vs. mA - mH plane. The observed (expected) exclusion region reaches mH = 108 (106) GeV for mA - mH = 78 (76) GeV and at mH = 70 GeV, covers the range of mA - mH = 40-90 (35-90) GeV.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11586/601847
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