Abstract
A search is performed for W′ bosons decaying to a top and a bottom quark in the all-hadronic final state, in proton-proton collisions at a center-of-mass energy of 13TeV. The analyzed data were collected by the CMS experiment between 2016 and 2018 and correspond to an integrated luminosity of 137fb−1. Deep neural network algorithms are used to identify the jet initiated by the bottom quark and the jet containing the decay products of the top quark when the W boson from the top quark decays hadronically. No excess above the estimated standard model background is observed. Upper limits on the production cross sections of W′ bosons decaying to a top and a bottom quark are set. Both left- and right-handed W′ bosons with masses below 3.4TeV are excluded at 95% confidence level, and the most stringent limits to date on W′ bosons decaying to a top and a bottom quark in the all-hadronic final state are obtained.
Highlights
The CERN LHC has strengthened the validity of the standard model (SM) of particle physics by providing a large volume of data to be compared with theoretical predictions
Where σW is the production cross section of the W boson, B is the branching fraction of a W boson decaying to a top and a bottom quark, followed by the hadronic decay of the W boson in the top quark decay chain, L denotes the integrated luminosity of the data used, and and A are the signal detection efficiency and the geometric and kinematic acceptance, respectively
A search has been performed for heavy W bosons decaying to a top and a bottom quark in the hadronic final state using data corresponding to an integrated luminosity of 137 fb−1 collected by the CMS experiment during the data taking period from 2016 to 2018
Summary
The CERN LHC has strengthened the validity of the standard model (SM) of particle physics by providing a large volume of data to be compared with theoretical predictions. The search performed by the CMS experiment on a similar data set, considering only leptonic final states from the t → bW → blν decay chain, excluded right- (left-)handed W bosons of masses roughly below 3.6 (3.4) TeV at 95% CL [16]. Most of the top quarks in decays of W bosons with masses greater than 1 TeV have large transverse momentum (pT), and their subsequent decay products are clustered into a single jet of particles This requires the use of techniques based on jet substructure [17,18] and machine learning [19] algorithms for the identification of the jets due to top quark decay (t tagging) that significantly reduce the background from multijet production in QCD in the case of an all-hadronic final state. Tabulated results are provided in HEPDATA [22]
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