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
A search is presented for the pair production of higgsinos 𝜒˜ in gauge-mediated supersymmetry models, where the lightest neutralinos 𝜒˜ 0 1 decay into a light gravitino 𝐺˜ either via a Higgs ℎ or 𝑍 boson. The search is performed with the ATLAS detector at the Large Hadron Collider using 139 fb−1 of...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| 其他作者: | |
| 格式: | Journal article |
| 語言: | English |
| 出版: |
Elsevier
2024
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| 總結: | A search is presented for the pair production of higgsinos 𝜒˜ in gauge-mediated supersymmetry
models, where the lightest neutralinos 𝜒˜
0
1
decay into a light gravitino 𝐺˜ either via a Higgs ℎ or
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 𝑏𝑏¯ 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 𝑏𝑏¯ 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 𝜒˜
0
1 → ℎ𝐺˜. This analysis
excludes higgsinos with masses of 130 GeV for branching fractions to ℎ𝐺˜ 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. |
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