Search for bottom-squark pair production with the ATLAS detector in final states containing Higgs bosons, $b$-jets and missing transverse momentum

Abstract

The result of a search for the pair production of the lightest supersymmetric partner of the bottom quark (${\tilde{b}}_1$) using 139 fb${}^{-1}$ of proton-proton data collected at $\sqrt{s}=13$ TeV by the ATLAS detector is reported. In the supersymmetric scenarios considered both of the bottom-squarks decay into a $b$-quark and the second-lightest neutralino, ${\tilde{b}}_1\to b+{\tilde{\chi }}_2^0$. Each ${\tilde{\chi }}_2^0$ is assumed to subsequently decay with 100% branching ratio into a Higgs boson ($h$) like the one in the Standard Model and the lightest neutralino: ${\tilde{\chi }}_2^0\to h+{\tilde{\chi }}_1^0$. The ${\tilde{\chi }}_1^0$ is assumed to be the lightest supersymmetric particle (LSP) and is stable. Two signal mass configurations are targeted: the first has a constant LSP mass of 60 GeV; and the second has a constant mass difference between the ${\tilde{\chi }}_2^0$ and ${\tilde{\chi }}_1^0$ of 130 GeV. The final states considered contain no charged leptons, three or more $b$-jets, and large missing transverse momentum. No significant excess of events over the Standard Model background expectation is observed in any of the signal regions considered. Limits at the 95% confidence level are placed in the supersymmetric models considered, and bottom-squarks with mass up to 1.5 TeV are excluded.

arXiv comment48 pages in total, author list starting page 32, 8 figures, 7 tables, published in JHEP, JHEP 12 (2019) 060. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/SUSY-2018-31/

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