Search for charged Higgs bosons decaying into top and bottom quarks in lepton+jets final states in proton-proton collisions at $$ sqrt{s}=13 $$ TeV
Journal Article
Overview
abstract
; A; bstract; ; ; A search is presented for charged Higgs bosons (H; ; ±; ; ) in proton-proton (pp) collision events via the pp → (b)H; ; ±; ; processes, with H; ; ±; ; decaying into top (t) and bottom (b) quarks. The search targets final states with one lepton, missing transverse momentum, and two or more b jets. The analysis is based on data collected at a center-of-mass energy of 13 TeV with the CMS detector at the CERN LHC, corresponding to an integrated luminosity of 138 fb; ; −; 1; ; . We search for charged Higgs bosons in the 200 GeV to 1 TeV mass range. The results are interpreted within the generalized two-Higgs-doublet model (g2HDM). This model predicts additional Yukawa couplings of the Higgs bosons to the top quark; ρ; tt; , the top and charm quark; ρ; tc; , and the top and up quark; ρ; tu; . This search focuses on the real components of; ρ; tt; and; ρ; tc; , which are probed up to values of unity. An excess is observed with respect to the standard model expectation with a local significance of 2.4 standard deviations for a signal with an H; ; ±; ; boson mass (; ; ; $$ {m}_{{mathrm{H}}^{pm }} $$; ; ; m; ; H; ±; ; ; ; ; ; ) of 600 GeV. Limits are derived on the product of the cross section; σ; (pp; →; (b)H; ; ±; ; ) and branching fraction ℬ(H; ; ±; ; →; tb; ,; t; →; b; ℓν; ), where; ℓ; = e; , μ; . The values of; ρ; tc; ≳ 0.11–0.38 are excluded at 95% confidence level, depending on the; ; ; $$ {m}_{{mathrm{H}}^{pm }} $$; ; ; m; ; H; ±; ; ; ; ; ; and; ρ; tt; assumptions. The results represent the first search for charged Higgs bosons within the g2HDM framework in the single-lepton final states and complement the existing results on additional neutral Higgs bosons perfomed in the same-sign top quark pair, three top quark, or four top quark final states, constraining extra Yukawa couplings for the neutral Higgs bosons below the TeV scale.;
