A direct search for new heavy neutral Higgs bosons A and H in the ttZ channel is presented, targeting the process pp->H->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 ttbar system is targeted. The analysis uses proton-proton collision data collected at the CERN LHC with the CMS experiment at sqrt(s)=13 TeV, which correspond 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 t(t)over-barZ channel in proton-proton collisions at 13 TeV
Tornago, M.;Cappati, A.;Amapane, N.;Argiro, S.;Bellan, R.;Bellora, A.;Borca, C.;Costa, M.;Covarelli, R.;Grippo, M.;Kiani, B.;Luongo, F.;Markovic, L.;Mecca, A.;Menzio, L.;Meridiani, P.;Migliore, E.;Mulargia, R.;Obertino, M. M.;Pacher, L.;Siviero, F.;Sola, V.;Solano, A.;Tarricone, C.;Umoret, G.;Salvatico, R.;Shchelina, K.;Rumerio, P.;Ravera, F.;Vagnerini, A.;
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->H->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 ttbar system is targeted. The analysis uses proton-proton collision data collected at the CERN LHC with the CMS experiment at sqrt(s)=13 TeV, which correspond 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.| File | Dimensione | Formato | |
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