Search for a charged Higgs boson decaying into top and bottom quarks in events with electrons or muons in proton-proton
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Springer
Received: August 24, 2019 Accepted: December 5, 2019 Published: January 16, 2020
The CMS collaboration E-mail: [email protected] Abstract: A search is presented for a charged Higgs boson heavier than the top quark, produced in association with a top quark, or with a top and a bottom quark, and decaying into a top-bottom quark-antiquark pair. The search is performed using proton-proton collision data collected by the CMS experiment at the LHC at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 35.9 fb−1 . Events are selected by the presence of a single isolated charged lepton (electron or muon) or an opposite-sign dilepton (electron or muon) pair, categorized according to the jet multiplicity and the number of jets identified as originating from b quarks. Multivariate analysis techniques are used to enhance the discrimination between signal and background in each category. The data are compatible with the standard model, and 95% confidence level upper limits of 9.6–0.01 pb are set on the charged Higgs boson production cross section times branching fraction to a top-bottom quark-antiquark pair, for charged Higgs boson mass hypotheses ranging from 200 GeV to 3 TeV. The upper limits are interpreted in different minimal supersymmetric extensions of the standard model. Keywords: Hadron-Hadron scattering (experiments), Higgs physics, Supersymmetry ArXiv ePrint: 1908.09206
Open Access, Copyright CERN, for the benefit of the CMS Collaboration. 3 Article funded by SCOAP .
https://doi.org/10.1007/JHEP01(2020)096
JHEP01(2020)096
Search for a charged Higgs boson decaying into top and bottom quarks in events with electrons or muons √ in proton-proton collisions at s = 13 TeV
Contents 1
2 The CMS detector
3
3 Event simulation
4
4 Event reconstruction
5
5 Event selection and classification
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6 Background estimation and systematic uncertainties
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7 Results
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8 Summary
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The CMS collaboration
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1
Introduction
Since the discovery of a Higgs boson [1–3] with a mass of 125 GeV [4, 5], the ATLAS and CMS collaborations have actively searched for additional neutral and charged Higgs bosons. Most theories beyond the standard model (SM) of particle physics enrich the SM Higgs sector; a simple extension is the assumption of the existence of two Higgs doublets [6–9]. Such models are collectively labeled as two-Higgs-doublet models (2HDM), and are further classified into four categories according to the couplings of the doublets to fermions. In Type-I models, only one doublet couples to fermions, while in Type-II models one doublet couples to the up-type quarks and the other to the down-type quarks and the charged leptons. In lepton-specific models one doublet couples only to the leptonic sector and the other couples to quarks, while in flipped models the first doublet couples specifically to the down-type quarks and the second one to the up-type quarks and charged leptons. The two-doublet structure of the 2HDM Higgs sector gives rise to five physical
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