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- W4385208541 abstract "A search for a new heavy scalar particle $X$ decaying into a Standard Model (SM) Higgs boson and a new singlet scalar particle $S$ is presented. The search uses a proton-proton ($pp$) collision data sample with an integrated luminosity of 140 fb$^{-1}$ recorded at a centre-of-mass energy of $sqrt{s} = 13$ TeV with the ATLAS detector at the Large Hadron Collider. The most sensitive mass parameter space is explored in $X$ mass ranging from 500 to 1500 GeV, with the corresponding $S$ mass in the range 200-500 GeV. The search selects events with two hadronically decaying $tau$-lepton candidates from $Hto tau^+tau^-$ decays and one or two light leptons ($ell=e,,mu$) from $Sto VV$ ($V = W,,Z$) decays while the remaining $V$ boson decays hadronically or to neutrinos. A multivariate discriminant based on event kinematics is used to separate the signal from the background. No excess is observed beyond the expected SM background and 95% confidence level upper limits between 72 fb and 542 fb are derived on the cross-section $sigma(ppto Xto SH)$ assuming the same SM-Higgs boson-like decay branching ratios for the $Sto VV$ decay. Upper limits on the visible cross-sections $sigma(ppto Xto SH to WWtautau)$ and $sigma(ppto Xto SH to ZZtautau)$ are also set in the ranges 3-26 fb and 6-33 fb, respectively." @default.
- W4385208541 created "2023-07-25" @default.
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