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Search for pair-produced higgsinos decaying via Higgs or Z bosons to final states containing a pair of photons and a pair of b-jets with the ATLAS detector

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A search is presented for the pair production of higgsinos χ in gauge-mediated supersymmetry models, where the lightest neutralinos χ0 1 decay into a light gravitino G in association with either a Higgs ℎ or a 𝑍 boson.The search is performed with the ATLAS detector at the Large Hadron Collider using 139 fb -1 of proton-proton collisions at a centre-of-mass energy of √ 𝑠 = 13 TeV.It targets final states in which a Higgs boson decays into a photon pair, while the other Higgs or 𝑍 boson decays into a 𝑏 b pair, with missing transverse momentum associated with the two gravitinos.Search regions dependent on the amount of missing transverse momentum are defined by the requirements that the diphoton mass should be consistent with the mass of the Higgs boson, and the 𝑏 b mass with the mass of the Higgs or 𝑍 boson.The main backgrounds are estimated with data-driven methods using the sidebands of the diphoton mass distribution.No excesses beyond Standard Model expectations are observed and higgsinos with masses up to 320 GeV are excluded, assuming a branching fraction of 100% for χ0 1 → ℎ G.This analysis excludes higgsinos with masses of 130 GeV for branching fractions to ℎ G as low as 36%, thus providing complementarity to previous ATLAS searches in final states with multiple leptons or multiple 𝑏-jets, targeting different decays of the electroweak bosons.In the Minimal Supersymmetric Standard Model [1,2] two neutral higgsinos, the proposed spin-half supersymmetric (SUSY) [3] partners of Higgs bosons, mix together with the spin-half partners of the neutral SU(2) 𝐿 and U(1) 𝑌 gauge bosons, forming four neutralino states χ0 1,2,3,4 , while the charged higgsino mixes with the spin-half partners of the 𝑊 ± to form two pairs of chargino states χ± 1,2 , where indices are ordered in increasing mass.When the mass terms for the spin-half partners of the gauge bosons are large, the most accessible electroweak states at colliders are the lightest, higgsino-dominated, neutralinos χ0 1 , χ0 2 and charginos χ± 1 .These particles are expected to have a mass around the electroweak scale following naturalness arguments [4,5], with mass splittings of 1 GeV or less.Such mass spectra are predicted, for example, in general gauge mediation (GGM) models [6-10] or in gauge-mediated supersymmetry breaking (GMSB) models [6-8] in which the lightest neutralino χ0 1 is higgsino dominated and decays into a light gravitino ( G) [11], the proposed spin-3 2 partner of the graviton, in association with a Higgs boson ℎ or 𝑍 boson.The heavier χ0 2 and χ± 1 decay into the lighter χ0The subsequent decay products of the ℎ and the 𝑍 can be detected in a variety of different decay modes.Decays of the lightest neutralino into photons are also possible, but result in significantly different final states, which are considered in other searches, e.g.Ref. [12].This paper presents a search that targets final states in which a Higgs boson decays into a photon pair, while the other Higgs boson decays into a 𝑏 b pair, with missing transverse momentum associated with the two gravitinos.This final state also has sensitivity to mixed decays in which one neutralino decays into ℎ and one into 𝑍 where the 𝑍 decays into a pair of 𝑏-quarks, as shown in Fig. 1.The ATLAS Collaboration has previously performed searches using events with at least three 𝑏-jets [13], in ℎ → 𝛾𝛾 events without requiring the 𝑏-jet decay mode of the other boson [14], events with four or more leptons [15], events containing two

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DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.

Titre Crossref
Search for pair-produced higgsinos decaying via Higgs or Z bosons to final states containing a pair of photons and a pair of b-jets with the ATLAS detector
Date Crossref
01/09/2024
Éditeur
Elsevier BV
Type
journal-article

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Sujets associés

Particle physics theoretical and experimental studiesCosmology and Gravitation TheoriesParticle Detector Development and Performance

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