Direct measurement of the top quark mass by the DØ Collaboration

B Abbott ,R Partridge,M Paterno,B Gómez,C Boswell,N I Bojko,N K Mondal,H Piekarz,G E Forden,J P Negret,J Kotcher,A N Galyaev,A Jonckheere,D A Stoianova,V Oguri,T Yasuda,H D Wahl,S Blessing,V A Bezzubov,J Sculli,M Abolins,G Di Loreto,J Jaques,B Baldin,F Hsieh,R K Shivpuri,K M Mauritz,F Stichelbaut,R Madden,K C Frame,C Klopfenstein,J Kourlas,P Rubinov,H E Fisk,M Roco,M Bhattacharjee,N Grossman,N A Roe,F Landry,T Huehn,H Weerts,R Engelmann,S Fuess,A Para,B Gibbard,R Jesik,M Demarteau,G Wang,P I Goncharov,H Da Motta,K Streets,H C Shankar,J H Christenson,R E Hall,H E Montgomery,M Chung,B Gobbi,J Snow,P M Sood,G Eppley,A L Spadafora,R Yamada,P Yepes,G Finocchiaro,A V Kostritskiy,L Coney,M R Krishnaswamy,T Mckibben,R J Madaras,T Fahland,A Narayanan,K Genser,R Piegaia,D Fein,J A Wightman,D Karmanov,J Tarazi,B G Pope,R Markeloff,V Balamurali,A L Lyon,V M Podstavkov,L T Goss,M Fortner,T Marshall,J M Hauptman,E Flattum,J M Kohli,P Padley,M Sosebee,H Greenlee,J Mckinley,A S Ito,P Hanlet,Q Z Li-Demarteau,T G Trippe,E Oltman,R D Schamberger,S Banerjee,W E Cooper,K Del Signore,S Y Jun,C Shaffer,A V Kozelov,S P Denisov,Y E Gutnikov,T Heuring,T Rockwell,N Amos,K W Merritt,A Bross,E G Zverev,C Yoshikawa,B May,D Cullen-Vidal,M L Stevenson,A Boehnlein,K Gounder,N Parua,J Womersley,M Strovink,D Vititoe,E A Kozlovski,S Glenn,P D Grannis,P M Tuts,P Yamin,H L Melanson,V Manankov,E James,N Graf,D Buchholz,J Ellison,G Guglielmo,Z Casilum,V Sirotenko,V S Narasimham,A Baden,S A Jerger,R J Genik,K Bazizi,F Nang,H A Neal,P Grudberg,A P Heinson,S N Gurzhiev,S Chopra,S Mani,O V Eroshin,J F Bartlett,E W Anderson,A Leflat,F Borcherding,P Tamburello,H Jöstlein,D Chakraborty,B Hoeneisen,A Zylberstejn,J L González Solís,R Hernández-Montoya,H Schellman,S Lami,C Cretsinger,J Bantly,F Lobkowicz,N Sotnikova,D Hedin,N Oshima,M Merkin,D Denisov,W G Cobau,M Diesburg,L Magaña-Mendoza,R Astur,J Balderston,D Edmunds,A Goldschmidt,H T Diehl,A P Vorobiev,J Warchol,M Jones,S Willis,Y Ducros,B Pawlik,E Won,A Klatchko,P Gartung,Y Fisyak,H Haggerty,J Solomon,L Lueking,P Z Quintas,J S Hoftun,S Reucroft,L Oesch,S Youssef,D P Stoker ,H A Gordon ,E W Varnes ,H Aihara ,John Mcdonald ,V Hagopian ,A Brandt ,Shihyun Ahn ,R Ruchti ,S C Eno ,H Miettinen ,R Hirosky ,H Li ,O I Dahl ,S Grünendahl ,B Lauer ,M Johnson ,I A Bertram ,Michael Peters ,В Н Евдокимов ,T L Geld ,A Sznajder ,W Smart ,Y C Liu ,J Linnemann ,A Volkov ,M A Shupe ,J Perkins ,E G De Oliveira ,D Owen ,W Carvalho ,S Kahn ,A Santoro ,T J Mcmahon ,J T White ,J Krane ,D Casey ,M Wayne ,S Kunori ,G Watts ,M Rijssenbeek ,S Grinstein ,E Shabalina ,S V Chekulaev ,S Loken ,V Bhatnagar ,Y M Park ,N J Hadley ,R Snihur ,Y Pischalnikov ,L Rasmussen ,A Sánchez-Hernández ,A A Mayorov ,K De ,W Chen ,S Lökòs ,D Ćutts ,J M Guida ,C K Jung ,G R Snow ,J A Guida ,T L Thomas ,N Mokhov ,David J Stewart ,D R Green ,J Thompson ,A White ,D Wood ,G Grim ,J Cochran ,S K Kim ,R Lipton ,U Heintz ,T Hu ,В С Буртовой ,A R Clark ,R W Stephens ,S Hagopian ,N N Biswas ,H Castilla‐Valdez ,R Lander ,M M Baarmand ,P Gutiérrez ,P Ermolov ,Y Yu ,Jun Jiang ,E Smith ,S Protopopescu ,E Barberis ,S Snyder ,V Kochetkov ,K A Johns ,B C Choudhary ,R L Mccarthy ,V D Elvira ,G Kalbfleisch ,L Dudko ,И Адам ,R Kehoe ,J V.d Wirjawan ,P C Bhat ,Ting Hu ,P C Bloom ,S Dugad ,C L Kim ,K S Hahn ,J Li ,M Kelly ,S Krzywdziński ,J Yang ,P Némethy ,D Koltick ,S Rajagopalan ,B Klima ,T Adams ,L P Chen ,J Hobbs ,D R Claes ,A Ziemiński ,R Brock ,M Souza ,C S Mishra ,G Gómez ,J Yu ,C E Gerber ,R P Smith ,S Choi ,J G.r Lima ,T Joffe–Minor ,A Kotwal ,M Martin ,J B Singh ,V Klyukhin ,J Qian ,D J Karmgard ,S M Chang ,H Singh ,A G Goussiou ,G A Alves ,M R Adams ,M Narain ,D Ziemińska ,L Sawyer ,D Norman ,C Murphy ,G Steinbrück ,S B Beri ,M A.c Cummings ,D Lincoln ,P Mooney ,P Draper ,E J Gallas ,B S Acharya ,H S Mao ,A Gupta ,N Varelas ,K Davis ,H Xu ,A I Mincer ,Z H Zhu ,S Wimpenny ,M Strauss ,G Blazey ,S Hansen ,R Raja ,J S Kang ,M Tartaglia ,O Ramírez ,A K.a Maciel ,A Belyaev ,T Ferbel ,M Fatyga ,J M Butler ,G Landsberg ,J P Rutherfoord ,S Fehér ,H Prosper ,S Linn

doi:10.1103/physrevd.58.052001

Abstract

We determine the top quark mass m{sub t} using t{bar t} pairs produced in the DO/ detector by {radical} (s) =1.8thinspTeV p{bar p} collisions in a 125thinsppb{sup {minus}1} exposure at the Fermilab Tevatron. We make a two constraint fit to m{sub t} in t{bar t}{r_arrow}bW{sup +}{bar b}W{sup {minus}} final states with one {ital W} boson decaying to q{bar q} and the other to e{nu} or {mu}{nu}. Likelihood fits to the data yield m{sub t}(l+jets)=173.3{plus_minus}5.6thinsp(stat)thinsp{plus_minus}thinsp5.5thinsp(s st) GeV/c{sup 2}. When this result is combined with an analysis of events in which both {ital W} bosons decay into leptons, we obtain m{sub t}=172.1{plus_minus}5.2thinsp(stat)thinsp{plus_minus}thinsp4.9thinsp(syst) GeV/c{sup 2}. An alternate analysis, using three constraint fits to fixed top quark masses, gives m{sub t}(l+jets)=176.0{plus_minus}7.9thinsp(stat){plus_minus}thinsp4.8thinsp(syst) GeV/c{sup 2}, consistent with the above result. Studies of kinematic distributions of the top quark candidates are also presented. {copyright} {ital 1998} {ital The American Physical Society}

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