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Global LHC constraints on electroweak-inos with SModelS v2.3

by Mohammad Mahdi Altakach, Sabine Kraml, Andre Lessa, Sahana Narasimha, Timothée Pascal, Théo Reymermier, Wolfgang Waltenberger

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Submission summary

Authors (as registered SciPost users): Sabine Kraml · Timothée Pascal · Wolfgang Waltenberger
Submission information
Preprint Link:  (pdf)
Code repository:
Data repository:
Date accepted: 2024-03-21
Date submitted: 2024-03-13 10:48
Submitted by: Pascal, Timothée
Submitted to: SciPost Physics
Ontological classification
Academic field: Physics
  • High-Energy Physics - Experiment
  • High-Energy Physics - Phenomenology
Approach: Phenomenological


Electroweak-inos, superpartners of the electroweak gauge and Higgs bosons, play a special role in supersymmetric theories. Their intricate mixing into chargino and neutralino mass eigenstates leads to a rich phenomenology, which makes it difficult to derive generic limits from LHC data. In this paper, we present a global analysis of LHC constraints for promptly decaying electroweak-inos in the context of the minimal supersymmetric standard model, exploiting the SModelS software package. Combining up to 16 ATLAS and CMS searches for which electroweak-ino efficiency maps are available in SModelS, we study which combinations maximise the sensitivity in different regions of the parameter space, how fluctuations in the data in individual analyses influence the global likelihood, and what is the resulting exclusion power of the combination compared to the analysis-by-analysis approach.

List of changes

- Title page: The “University of Vienna, Faculty of Physics, Boltzmanngasse 5, A-1090 Wien, Austria” (affiliation 5) has been added to the affiliation of the author Sahana Narasimha

- Page 3, first paragraph of section 2 (referee 3): In reaction to the referee’s remark about decays via sleptons, we added the sentence: “Throughout the paper we assume that the other SUSY particles are heavier than the EW-inos, so they do not influence the phenomenology discussed here.” (Details regarding the experimental results for EW-ino decays via sleptons are discussed in the reply to the referee.)

- Page 4 (referee 2): Following the referee’s suggestion, tan(beta)=v_2/v_1 has been changed to tan(beta)=v_u/v_d.

- Page 5 (referee 2): We added: “To guide the eye, neutralinos are indicated in blue and charginos in red.” in the caption of Figure 2.

- Pages 15-16 (referee 2): The fact that CMS-SUS-20-004 and CMS-SUS-21-002 both use the full Run-2 dataset has been made explicit in the first lines of the corresponding paragraphs.

- Page 17 (referee 2): In response to the question whether we enforced a light Higgs mass of 125 GeV, we added a clarifying remark at the end of the first paragraph of section 4.1: “[The mass spectra and decay tables were computed with SOFTSUSY 4.1.11], setting m_h=125 GeV for consistency of the decay calculations”.

- Page 21 (referee 2): We added a sentence at the end of the second paragraph of section 5 quantifying the relevance of the NLO cross sections: “Regarding the importance of using NLO cross sections, 611 points (≈ 15%) would not have been excluded by the combination had we used LO instead of NLO cross sections.”

- Page 25 (referee 3): We added a clarifying remark regarding chargino1 decays in the caption of Figure 15: “$\tilde\chi^\pm_1$ decays are not specified as the only available decay mode is into $W + \tilde\chi_1^0$”.

- Page 32 (referee 1): We added a sentence to the next-to-last paragraph in section 6 pointing out the connection to naturalness and providing a reference: “Such light higgsinos are in particular motivated by naturalness arguments, see e.g. [76] and references therein.”

- Page 32 (no referee): The Cernbox link has been changed to a Zenodo link in the “Data management” paragraph.

- Pages 36-37 (referee 2): In Figure 23, the colours of the lines for minmassgap values of 15 GeV and 20 GeV were changed to green and salmon, respectively, and the description on page 36 was modified accordingly. We hope that the colours in Figure 23 are now well distinguishable.

- References: Added reference [76] H. Baer et. al, 2024 (see the point above regarding connection to naturalness by referee 1).

Published as SciPost Phys. 16, 101 (2024)

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