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Search for third-generation scalar leptoquarks and heavy right-handed neutrinos in final states with two tau leptons and two jets in proton-proton collisions at √s=13 TeV

By A.M. Sirunyan, Hugues Brun, Barbara Clerbaux, Gilles De Lentdecker, Hugo Delannoy, Giuseppe Fasanella, Laurent Favart, Reza Goldouzian, Anastasia Grebenyuk, Georgia Karapostoli, Thomas Lenzi, Alexandre Leonard, Jelena Luetic, Thierry Maerschalk, Audrey Marinov, Aidan Sean Randle-Conde, Tomislav Seva, Catherine Vander Velde, Pascal Vanlaer, David Vannerom, Ryo Yonamine, Florian Zenoni and Fengwangdong Zhang

Abstract

A search is performed for third-generation scalar leptoquarks and heavy right-handed neutrinos in events containing one electron or muon, one hadronically decaying τ lepton, and at least two jets, using a s=13 TeV pp collision data sample corresponding to an integrated luminosity of 12.9 fb-1 collected with the CMS detector at the LHC in 2016. The number of observed events is found to be in agreement with the standard model prediction. A limit is set at 95% confidence level on the product of the leptoquark pair production cross section and β2, where β is the branching fraction of leptoquark decay to a τ lepton and a bottom quark. Assuming β = 1, third-generation leptoquarks with masses below 850 GeV are excluded at 95% confidence level. An additional search based on the same event topology involves heavy right-handed neutrinos, NR, and right-handed W bosons, WR, arising in a left-right symmetric extension of the standard model. In this search, WR bosons are assumed to decay to a tau lepton and NR followed by the decay of the NR to a tau lepton and an off-shell WR boson. Assuming the mass of the right-handed neutrino to be half of the mass of the right-handed W boson, WR boson masses below 2.9 TeV are excluded at 95% confidence level. These results improve on the limits from previous searches for third-generation leptoquarks and heavy right-handed neutrinos with τ leptons in the final state.0info:eu-repo/semantics/publishe

Topics: Physique des particules élémentaires
Publisher: 'Springer Science and Business Media LLC'
Year: 2017
DOI identifier: 10.1007/JHEP07(2017)121
OAI identifier: oai:dipot.ulb.ac.be:2013/268627
Provided by: DI-fusion
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