In 2HDM Type-I with inverted hierarchy, applying m_ll in 20-50 GeV and m_bb below 100 GeV makes A to Z* h to ll bb stand out against Drell-Yan and ttbar backgrounds.
Search for a heavy pseudoscalar boson decaying to a Z and a Higgs boson at $\sqrt{s} =$ 13 TeV
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abstract
A search is presented for a heavy pseudoscalar boson A decaying to a Z boson and a Higgs boson with mass of 125 GeV. In the final state considered, the Higgs boson decays to a bottom quark and antiquark, and the Z boson decays either into a pair of electrons, muons, or neutrinos. The analysis is performed using a data sample corresponding to an integrated luminosity of 35.9 fb$^{-1}$ collected in 2016 by the CMS experiment at the LHC from proton-proton collisions at a center-of-mass energy of 13 TeV. The data are found to be consistent with the background expectations. Exclusion limits are set in the context of two-Higgs-doublet models in the A boson mass range between 225 and 1000 GeV.
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Optimizing $pp\to A\to Z^{*}h\to \ell^+\ell^- b\bar b$ Searches at the LHC in the 2HDM Type-I with Inverted Hierarchy
In 2HDM Type-I with inverted hierarchy, applying m_ll in 20-50 GeV and m_bb below 100 GeV makes A to Z* h to ll bb stand out against Drell-Yan and ttbar backgrounds.