A direct search for new heavy neutral Higgs bosons A and H in the ttZ channel is presented, targeting the process pp → A → ZH with H → tt. For the first time, the channel with decays of the Z boson to muons or electrons in association with all- hadronic decays of the tt system is targeted. The analysis uses proton-proton collision data collected at the CERN LHC with the CMS experiment at √s = 13 TeV, which cor- respond to an integrated luminosity of 138 fb−1. No signal is observed. Upper limits on the product of the cross section and branching fractions are derived for narrow resonances A and H with masses up to 2100 and 2000 GeV, respectively, assuming A boson production through gluon fusion. The results are also interpreted within two- Higgs-doublet models, where A and H are CP-odd and CP-even states, respectively, complementing and substantially extending the reach of previous searches
Search for heavy neutral Higgs bosons A and H in the ttZ channel in proton-proton collisions at 13 TeV
Cavallo, N.;Fabozzi, F.;
2025-01-01
Abstract
A direct search for new heavy neutral Higgs bosons A and H in the ttZ channel is presented, targeting the process pp → A → ZH with H → tt. For the first time, the channel with decays of the Z boson to muons or electrons in association with all- hadronic decays of the tt system is targeted. The analysis uses proton-proton collision data collected at the CERN LHC with the CMS experiment at √s = 13 TeV, which cor- respond to an integrated luminosity of 138 fb−1. No signal is observed. Upper limits on the product of the cross section and branching fractions are derived for narrow resonances A and H with masses up to 2100 and 2000 GeV, respectively, assuming A boson production through gluon fusion. The results are also interpreted within two- Higgs-doublet models, where A and H are CP-odd and CP-even states, respectively, complementing and substantially extending the reach of previous searchesI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.


