Search for heavy neutrinos or third-generation leptoquarks in final states with two hadronically decaying τ leptons and two jets in proton-proton collisions at s=13$$ \sqrt{s}=13 $$ TeV
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Khachatryan2017_Article_SearchForHeavyNeutrinosOrThird.pdf
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Author(s)
CMS Collaboration
Abercrombie, Daniel Robert
Allen, Brandon Leigh
Apyan, Aram
Barbieri, Richard Alexander
Baty, Austin Alan
Bi, Ran
Bierwagen, Katharina
Brandt, Stephanie Akemi
Busza, Wit
Date Issued
March 2017
Journal
Journal of High Energy Physics
Publisher
Springer Nature
Citation
Khachatryan, V. et al. “Search for Heavy Neutrinos or Third-Generation Leptoquarks in Final States with Two Hadronically Decaying τ Leptons and Two Jets in Proton-Proton Collisions at √s = 13 TeV.” Journal of High Energy Physics 2017, 3 (March 2017): 77 © 2017 The Author(s)
Version
Final published version
Abstract
A search for new particles has been conducted using events with two high transverse momentum (pT) τ leptons that decay hadronically, at least two high-pT jets, and missing transverse energy from the τ lepton decays. The analysis is performed using data from proton-proton collisions, collected by the CMS experiment in 2015 at √s = 13 TeV, corresponding to an integrated luminosity of 2.1 fb⁻¹. The results are interpreted in two physics models. The first model involves heavy right-handed neutrinos, Nℓ(ℓ = e, μ, τ), and right-handed charged bosons, WR, arising in a left-right symmetric extension of the standard model. Masses of the W[subscript R] boson below 2.35 (1.63) TeV are excluded at 95% confidence level, assuming the N[subscript τ]mass is 0.8 (0.2) times the mass of the W[subscript R] boson and that only the N[subscript τ]flavor contributes to the W[subscript R]decay width. In the second model, pair production of third-generation scalar leptoquarks that decay into ττbb is considered. Third-generation scalar leptoquarks with masses below 740 GeV are excluded, assuming a 100% branching fraction for the leptoquark decay to a τ lepton and a bottom quark. This is the first search at hadron colliders for the third-generation Majorana neutrino, as well as the first search for third-generation leptoquarks in the final state with a pair of hadronically decaying τ leptons and jets. Keywords: Beyond Standard Model; Hadron-Hadron scattering (experiments); protonproton scattering
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1007/JHEP03(2017)077
