Work

Consistent excesses in the LHC electroweak SUSY searches: GUT-based Singlino/Higgsino interpretation in the NMSSM

Year: 2026

Type: article

Abstract: The search for signatures of supersymmetric models remains one of the main item on the BSM search program at the LHC, with EW SUSY partners still allowed with masses as low as a few hundred GeV. Over the last years, searches for the “golden channel”, $$pp \rightarrow \tilde{\chi }_{2}^0 \tilde{\chi }_{1}^\pm \rightarrow \tilde{\chi }_{1}^0 Z^{(*)} \, \tilde{\chi }_{1}^0 W^{\pm (*)}$$ p p → χ ~ 2 0 χ ~ 1 ± → χ ~ 1 0 Z ( ∗ ) χ ~ 1 0 W ± ( ∗ ) show consistent excesses between ATLAS and CMS in the 2 soft-lepton and 3 soft-lepton plus $$E_T\hspace{-4.5mm}/$$ E T / searches, assuming "Equation missing" and $$\Delta m_{21}{:=} m_{\tilde{\chi }_{2}^0} - m_{\tilde{\chi }_{1}^0} \approx 20 \,\, \textrm{GeV}$$ Δ m 21 : = m χ ~ 2 0 - m χ ~ 1 0 ≈ 20 GeV . We interpret these excesses in the framework of the Next-to-Minimal Supersymmetric Standard Model (NMSSM). We assume a singlino dominated lightest neutralino, $$\tilde{\chi }_{1}^0$$ χ ~ 1 0 , as a Dark Matter (DM) candidate. The second and third lightest neutralinos, $$\tilde{\chi }_{2,3}^0$$ χ ~ 2 , 3 0 are higgsino like, with the higgsino mixing parameter $$\mu $$ μ being smaller than the soft SUSY-breaking bino and wino masses, $$M_1$$

Source: The European Physical Journal C

DOI: 10.1140/epjc/s10052-026-15987-4

Authors: Emanuele Bagnaschi, Manimala Chakraborti, Sven Heinemeyer, Ipsita Saha

Institutions: Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati, University of Southampton, Universidad Autónoma de Madrid, Indian Institute of Technology Madras

Language: English

Topic: Particle physics theoretical and experimental studies

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: diamond