Abstract
A search is presented for narrow heavy resonances decaying to a top quark and a bottom quark using data collected by the CMS experiment at s=13TeV in 2016. The data set analyzed corresponds to an integrated luminosity of 35.9fb−1 . Final states that include a single lepton (e, μ), multiple jets, and missing transverse momentum are analyzed. No evidence is found for the production of a W′ boson, and the production of right-handed W′ bosons is excluded at 95% confidence level for masses up to 3.6TeV depending on the scenario considered. Exclusion limits for W′ bosons are also presented as a function of their coupling strength to left- and right-handed fermions. These limits on a W′ boson decaying via a top and a bottom quark are the most stringent published to date.
Highlights
Despite the broad success of the standard model (SM), the absence of answers to the hierarchy problem, among other shortcomings, has led to the development of many theories for new physics that lies beyond the SM
To estimate the uncertainty arising from the choice of parton distribution function (PDF), we evaluate the root-mean-square of the distribution of 100 NNPDF 3.0 replicas as the ±1 s.d. uncertainties according to the guidelines in Ref. [50]
A search for a narrow heavy W boson resonance decaying to a top quark and a bottom quark has √been performed in lepton+jets final states using data collected at s = 13 TeV by the CMS detector in 2016, corresponding to an integrated luminosity of 35.9 fb−1
Summary
Despite the broad success of the standard model (SM), the absence of answers to the hierarchy problem, among other shortcomings, has led to the development of many theories for new physics that lies beyond the SM. In scenarios where the W boson is sufficiently heavy, the decay W → tb has several features that make it an appealing search channel Searches in this channel directly probe the W boson coupling to third generation quarks, which, in some models [6,7], can be enhanced with respect to the coupling to lighter quarks. Events with exactly one electron or muon, significant missing transverse momentum, and multiple jets in the final state are selected This search focuses on W bosons with widths that are narrow compared to their masses. In addition to searching for W bosons with purely rightor left-handed couplings, we search for W bosons with varying combinations of these couplings This analysis is sensitive to W bosons with masses between 1 and 4 TeV
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