Search for W′ boson production in the W′→tb¯ decay channel

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Hauser,G Landsberg,S Anderson,A Haas,Z Liu,I Iashvili,N Varelas,R Schwienhorst,G Brooijmans,Y Coadou,S Calvet,P Calfayan,M Verzocchi,C Autermann,F Blekman,G Borissov,C Royon,A Dominguez,C Hensel,I Fleck,A Santoro,P Lewis,G Pawloski,M Vreeswijk,M Titov,S Towers,G Blazey,M Talby,M Voutilainen,D Brown,A Khanov,M Perfilov,L Mendoza,L Wang,M Wobisch,V Gavrilov,A Schwartzman,M Tomoto,J.-F Grivaz,H Kim,A Vartapetian,J Kvita,T Andeen,Y Gershtein,J Linnemann,M Owen,F Rizatdinova,B Clément,M Souza,R Hirosky,A Dyshkant,T Zhao,F Filthaut,J Estrada,T Ferbel,A.-C Le Bihan,H Evans,E Barberis,L Sawyer,L Mundim,D Lincoln,N Oliveira,S Caron,C Barnes,A Duperrin,J Gardner,S Desai,A Quadt,F Déliot,T Bose,J Zhu,G Davies,B Abbott,S Hagopian,M Martens,K Ranjan,M Corcoran,G Watts,M Rijssenbeek,W Taylor,P Ermolov,A Askew,S Malik,S Protopopescu,H D Yoo ,K A Johns ,V A Bezzubov ,E M Gregores ,C Garćıa ,G R Snow ,R J Madaras ,Ashok Das ,P C Bhat ,J A Benitez ,J P Konrath ,P J Van Den Berg ,E J Gallas ,A Kupčo ,R D Schamberger ,A Juste Rozas ,M P Sanders ,C Galea ,J Levêque ,M A Pleier ,J P Negret ,P D Grannis ,P N Ratoff ,D V Bandurin ,S J Park ,Y M Kharzheev ,B C Choudhary ,H A Neal ,W D Shephard ,S E.k Mattingly ,P M Tuts ,R F Rodrigues ,S H Ahn ,C E Gerber ,D Wood ,R E Hall ,S Wimpenny ,J Hegeman ,P A Love ,H S Mao ,S Cŕéṕe-Renaudin ,K J Rani ,M Zieliński ,J M Butler ,R L Mccarthy ,N J Hadley ,J R Kalk ,M Kirby ,A Popov ,Nguyễn Thị Xuân ,T R Wyatt ,E Boos ,B E Cox ,V V Tokmenin ,D C O’neil ,D Blöch ,B S Acharya ,W C Fisher ,J R Vlimant ,Andre David Tinoco Mendes ,P Mal ,D A Stoyanova ,I A Vasilyev ,T Kühl ,B C.k Casey ,W E Cooper ,J Degenhardt ,R W Moore ,J A Parsons ,Z Hubáček ,E W Varnes ,G D Alexeev ,H J Lubatti ,A K.a Maciel ,Y D Mutaf ,Z D Greenwood ,A V Kozelov ,R A Sidwell ,D R Claes ,M S Anzelc ,S K Park ,А Калинин ,R D Harrington ,G A Alves ,Sandhya Jain ,G W Wilson ,S B Beri ,Arun Kumar ,N K Mondal ,R P Smith ,S W Youn ,H Malbouisson ,R Démina ,K Soustružnı́k ,A P Heinson ,H D Wahl ,T H Burnett ,G A Davis ,A A Shchukin ,V M Korablev ,S Dugad ,J M Kalk ,Yu Chen ,W L Prado Da Silva ,Q Z Li ,A García-Bellido ,M Hildreth ,W M Van Leeuwen ,P M Perea ,I A Bertram ,S F Novaes ,V Šimák ,Brian Davies ,H E Fisk ,G Hamel De Monchenault ,D Ziemińska ,S N Fatakia ,Mrinal Kumar Das ,C A Johnson ,M Strang ,R K Shivpuri ,S J De Jong ,N A Naumann ,T J Kim ,M Lokajı́ček ,C Ávila ,M Kopál ,A S Ito ,H Prosper ,S Bürke ,J G.r Lima ,Mark Doidge ,H Castilla‐Valdez ,S J Hong ,P Jönsson ,В Н Евдокимов ,A G Goussiou ,G J Otero Y Garzón ,T Bolton ,A Ziemiński ,A C.s Assis Jesus ,V I Ruď ,P Gutiérrez ,J M Heinmiller ,B G Pope ,P L.m Podesta-Lerma ,V O’dell ,D Ćutts ,A Ferapontov ,M R Adams ,J M Hauptman ,H T Diehl ,L Dudko ,S Strandberg ,M E Pol ,C Bélanger-Champagne ,M C Cousinou ,D K Cho ,V V Lipaev ,J Lazo-Flores ,V L Malyshev ,Y A Yatsunenko ,W M Lee ,K M Chan ,V M Podstavkov ,J Hobbs ,A L Lyon ,A S Turcot ,J M Kohli ,L S Vertogradov ,P A Kasper ,J F Bartlett ,S P Denisov ,M Grünewald ,V D Elvira ,N J Buchanan ,K M Black ,G Gutiérrez ,E Pérez ,G S Muanza ,N M Cason ,Han Liu ,K W Merritt ,C P Buszello ,G G Hesketh ,Bernard Andrieu ,K Hanagaki,A Bean,S Sumowidagdo,M Begel,C Clément,A Stone,S Kunori,J Li,E Busato,D Zhang,A Brandt,E Cheu,K Harder,S Eno,N Parashar,U Blumenschein,K De,F Lehner,I Hall,R Kaur,L Duflot,K Peters,M Strauss,Y Xie,W Carvalho,T Kurča,R Lipton,S Snyder,A Harel,V Bhatnagar,J Qian,H Severini,M Mulders,R Brock,A Kharchilava,R Kehoe,V Buescher,R Ruchti,D Tsybychev,J Mitrevski,J Elmsheuser,S Burdin,J Kasper,M Johnson,J Monk,Y Maravin,P Telford,T Edwards,O Boeriu,A Sznajder,L Uvarov,J Guo,P Pétroff,X Song,M Mulhearn,J Meyer,R Ströhmer,D Gelé,E Nagy,M Wayne,P Slattery,L Feligioni,P Bargassa,D Strom,A White,C Tully,M Begalli,M Narain,T Hebbeker,A.-M Magnan,N Makovec,N Wermes,S Trincaz-Duvoid,L Sonnenschein,S Kesisoglou,A Jenkins,K Jakobs,A Sánchez-Hernández,J Stark,A Lounis,H Miettinen,A Nomerotski,S Choi,B Vachon,E Shabalina,J.-L Agram,K Bloom,S Robinson,F Fiedler,S Kahn,B Klima,J Haley,S Lammers,S Jabeen,A Sopczak,G Bernardi,S Grünendahl,T Trefzger,P Baringer,B Zhou,U Heintz,H Fox,F Chevallier,M Weber,M Besançon,Ph Gris,D Schaile,E G Zverev

doi:10.1016/j.physletb.2006.09.021

Abstract

We present a search for the production of a new heavy gauge boson W′ that decays to a top quark and a bottom quark. We have analyzed 230 pb−1 of data collected with the DØ detector at the Fermilab Tevatron collider at a center-of-mass energy of 1.96 TeV. No significant excess of events above the standard model expectation is found in any region of the final state invariant mass distribution. We set upper limits on the production cross section of W′ bosons times branching ratio to top quarks at the 95% confidence level for several different W′ boson masses. We exclude masses between 200 and 610 GeV for a W′ boson with standard-model-like couplings, between 200 and 630 GeV for a W′ boson with right-handed couplings that is allowed to decay to both leptons and quarks, and between 200 and 670 GeV for a W′ boson with right-handed couplings that is only allowed to decay to quarks.

Highlights

The top quark sector offers great potential to look for new physics related to electroweak symmetry breaking
The analysis utilizes the same dataset, basic event selection, and background modeling as the DØ single top quark search described in Ref. [12]
We select signal-like events and separate the data into independent analysis sets based on final-state lepton flavor and b-tag multiplicity, where b-quark jets are tagged using reconstructed displaced vertices in the jets

Summary

Introduction

The top quark sector offers great potential to look for new physics related to electroweak symmetry breaking. The current limits on the single top quark production cross section in the s-channel are 6.4 pb [12, 13] and 13.6 pb [10] and do not depend much on whether the W boson coupling is left-handed or right-handed.

Results

Conclusion