Search for W′ → tb decays in the lepton + jets final state in pp collisions at $ \sqrt{s} $ = 8 TeV

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Nikitenko,E Ntomari,M Dittmar,R D’Alessandro,A Gude,A Benaglia,G P Heath,D Burton,K Sung,K Ozdemir,S Ganguly,A Uzunian,E Perez,V M Ghete,E Laird,A Zuranski,L Malgeri,E E Kangal,M Paganoni,F Yang,N Colino,J A Coughlan,N Wardle,M Gouzevitch,T Kolberg,J Mccartin,S Malik,F.-P Schilling,C Sander,A Volkov,I Golutvin,L Winstrom,A Holzner,D Stickland,W To,M Nguyen,A Giassi,F Hartmann,L Benussi,J Thom,B Bylsma,L Quertenmont,K Kanishchev,M Cepeda,B Bilki,C Goetzmann,A Brinkerhoff,M I Josa,M Bachtis,M Dragicevic,J Zhang,R Castello,P Vischia,A Elliott-Peisert,L Tourtchanovitch,C Vuosalo,L Scodellaro,B Lee,G Rakness,A Vartak,T Tuuva,T Cornelis,S Song,J Sturdy,M Baber,A Romero,L Pacher,S Alderweireldt,N Dupont-Sagorin,A Tsirou,K Harder,S Tosi,I Suarez,H Nogima,H A Weber,V Gavrilov,K Stenson,M Bellato,M Dobson,I Azhgirey,T Rohe,H Saka,L Favart,V Gori,N Pastrone,M A Buchmann,H Geenen,T Williams,K Maeshima,M Ruspa,W D Teo,P Giubilato,S Mukherjee,D J Karmgard,P Musella,N Cartiglia,A T Serban,W Ko,M Kirsanov,P Dauncey,P Petkov,M Rodozov,S Röcker,B Bilin,M Kadastik,M Albrow,N Tyurin,W Zou,R Wallny,J Hrubec,K Nawrocki,K Hatakeyama,N Kellams,J Keaveney,D Strom,Y Gao,R S Höing,S Belforte,D Stuart,M Goncharov,K Mazumdar,L Martini,I Bayshev,O Kaya

doi:10.1007/jhep05(2014)108

Abstract

Results are presented from a search for the production of a heavy gauge boson W' decaying into a top and a bottom quark, using a data set collected by the CMS experiment at sqrt(s) = 8 TeV and corresponding to an integrated luminosity of 19.5 inverse femtobarns. Various models of W'-boson production are studied by allowing for an arbitrary combination of left- and right-handed couplings. The analysis is based on the detection of events with a lepton (e, mu), jets, and missing transverse energy in the final state. No evidence for W'-boson production is found and 95% confidence level upper limits on the production cross section times branching fraction are obtained. For W' bosons with purely right-handed couplings, and for those with left-handed couplings assuming no interference effects, the observed 95% confidence level limit is M(W') > 2.05 TeV. For W' bosons with purely left-handed couplings, including interference effects, the observed 95% confidence level limit is M(W') > 1.84 TeV. The results presented in this paper are the most stringent limits published to date.

Highlights

Background modellingThe tt, W+jets, single-top-quark (s-channel, t-channel, and tW associated production), Z/γ∗+jets, and diboson (WW) background contributions are estimated from simulation, with corrections to the shape and normalisation derived from data.The tt, W+jets, and Z/γ∗+jets background processes are generated with MadGraph 5.1 [36]
The tt background is normalized to the next-to-next-to-leading order (NLO) (NNLO) cross section [37]
The SM single-top-quark backgrounds are estimated using samples generated with powheg [38], normalized to an approximate NNLO cross section [39]

Summary

TeV and corresponding to an integrated luminosity of

For W bosons with purely right-handed couplings, and for those with left-handed couplings assuming no interference effects, the observed 95% confidence level limit is M (W ) > 2.05 TeV. The CMS search at s = 7 TeV [24] set the best present mass limit in this channel of 1.85 TeV for W bosons with purely right-handed couplings. If the W boson has left-handed couplings, interference between W → tb and SM singletop-quark production via W → tb can contribute as much as 5–20% of the total W rate, depending on the W mass and couplings [26] This interference effect was taken into account in the CMS search. Following the approach of the earlier publication [24], we analyse events with an electron (e) or muon (μ), jets, and missing transverse energy (ETmiss) for an arbitrary combination of left- and right-handed couplings

CMS detector

Signal and background modelling

Signal modelling

Background modelling

Simulation

Object and event preselection

Data analysis

Systematic uncertainties

Results

Cross section limits

Limits on coupling strengths

Summary

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Journal: Journal of High Energy Physics	Publication Date: May 1, 2014
Citations: 34	License type: CC BY 4.0

R Discovery Prime

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Search for W′ → tb decays in the lepton + jets final state in pp collisions at $ \sqrt{s} $ = 8 TeV

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