Measurement of top quark polarization in tt¯ lepton+jets final states

V M Abazov ,I Kiselevich,S Atkins,W Ye,L Welty-Rieger,O Shkola,D Karmanov,L Bagby,R Bernhard,G Grenier,M Brochmann,D Denisov,R Partridge,S Uvarov,J Warchol,M Fortner,J Martínez-Ortega,A Jonckheere,J Orduna,V Shary,S Kermiche,R Van Kooten,F Badaud,S Chakrabarti,A Meyer,B Penning,R Magaña-Villalba,N Parua,I Ripp-Baudot,I Katsanos,S Yang,E Camacho-Pérez,D Vilanova,L Bellantoni,S Caughron,T Head,A Melnitchouk,G Ginther,R Beuselinck,E De La Cruz-Burelo,M Diesburg,G Golovanov,A Patwa,T Nunnemann,I Howley,M Prewitt,F Miconi,M Cooke,J Ellison,P Svoisky,A Evdokimov,H Hegab,S Uzunyan,A Bross,M Buehler,J Clutter,S Fuess,A Boehnlein,V Aushev,I Heredia-De La Cruz,D Edmunds,W Geng,T Scanlon,J Zennamo,B Baldin,J Lellouch,M Borysova,J Hays,J Weichert,A Pal,R Madar,K Herner,V Hynek,Y Peters,G Sajot,P Rubinov,G Alkhazov,M Eads,L Han,P Skubic,H Greenlee,C Schwanenberger,H Schellman,D Boline,M Merkin,S Greder,Y Scheglov,S Blessing,N Osman,Y Ilchenko,U Bassler,B Quinn,M Hohlfeld,K Devaughan,A Chandra,A Lobodenko,A Jayasinghe,O Gogota,A Alton,G Savage,P Lebrun,M Rominsky,D Menezes,D Hedin,N Khalatyan,V Bunichev,R Jesik,B Hoeneisen,K Yip,S Cihangir,T Yasuda,M Vesterinen,S Söldner-Rembold,B Tuchming,V Parihar,E Kajfasz,R Yamada,J Snow,E Johnson,R Illingworth,Y Aushev,P Neustroev,J Sekaric,S Banerjee,T Hoang,I Razumov,M Zieliński ,Y N Kharzheev ,V V Tokmenin ,N Stefaniuk ,S W Cho ,E Shabalina ,W E Cooper ,Ph Gris ,D Wood ,R Hirosky ,J M Hogan ,S Snyder ,E Boos ,P Gutiérrez ,L Sonnenschein ,Ashok Kumar ,M Wayne ,É Chapon ,P G Mercadante ,A Dubey ,V A Kuzmin ,E Barberis ,D Tsybychev ,F Déliot ,R L Mccarthy ,I Iashvili ,M Mulhearn ,V D Elvira ,J Franc ,Mark Richard James Williams ,N K Mondal ,M M Meijer ,V Gavrilov ,H Castilla‐Valdez ,S Bhatia ,M C Cousinou ,T R Wyatt ,I A Vasilyev ,B C.k Casey ,L Uvarov ,S Burdin ,S Dutt ,Michael Wang ,M Titov ,H Yin ,V V Lipaev ,J D Mansour ,J Yu ,M Hildreth ,J Joshi ,M Narain ,K Chan ,A Askew ,H Evans ,F Filthaut ,A W Jung ,L Li ,G D Alexeev ,H Liu ,R Ruchti ,A Ross ,M R Adams ,A P Heinson ,L Dudko ,S P Denisov ,Feng Liu ,M S Jeong ,Sijbrand J De Jong ,A Kupčo ,J.-F Grivaz ,A Grohsjean ,F Couderc ,E W Varnes ,M Jaffré ,S Desai ,J Zhu ,C Tully ,S Jabeen ,K Soustružnı́k ,D Ziemińska ,G Bernardi ,T Ferbel ,J P Negret ,L Sawyer ,I A Bertram ,M Grünewald ,Y T Tsai ,A V Kozelov ,Y Enari ,T Guillemin ,H S Lee ,J Linnemann ,T Adams ,D R Claes ,R Lipton ,A S Santos ,E Nagy ,D A Stoyanova ,U Heintz ,S Choi ,J M Hauptman ,K A Johns ,A Quadt ,Y Xie ,T Zhao ,C Royon ,N Varelas ,S B Beri ,D Ćutts ,M Lokajı́ček ,R D Schamberger ,R Nayyar ,S M Shaw ,A Duperrin ,J M Kohli ,G Chen ,D Lincoln ,L S Vertogradov ,R Brock ,G W Wilson ,T Hebbeker ,D Price ,R Démina ,Alexandre Fauré ,S W Lee ,V Bhatnagar ,J Hobbs ,Z Hubáček ,A Kharchilava ,Mark D Johnson ,P Slattery ,M Schott ,B Abbott ,C L Mcgivern ,M Savitskyi ,P Vokáč ,J L Holzbauer ,M Verzocchi ,L Suter ,K Petridis ,A Khanov ,C Hensel ,B Zhou ,F Rizatdinova ,P F Ding ,A Dominguez ,H T Diehl ,Y Gershtein ,M A Pleier ,A García-Bellido ,H Li ,Z Ye ,W M Van Leeuwen ,P D Grannis ,J Haley ,G Watts ,P H Garbincius ,S Malik ,B S Acharya ,K Bloom ,D Brown ,V Šimák ,C E Gerber ,C Ávila ,C P Buszello ,R Luna-García ,A S Ito ,P C Bhat ,R Schwienhorst ,J F Bartlett ,A A Shchukin ,J K Kraus ,V Buescher ,M Strauss ,Peng Jiang ,J Cúth ,Y A Yatsunenko ,V M Podstavkov ,S K Park ,M Besançon ,H Severini ,G G Hesketh ,R Lopes De ,R Kehoe ,W M Lee ,G Davies ,G R Snow ,Jaehoon Lim ,M Wobisch ,P N Ratoff ,S Lammers ,Q Z Li ,T Kurča ,H A Neal ,A Juste Rozas ,P Jönsson ,H D Wahl ,J Stark ,J Meyer ,H Fox ,A Y Verkheev ,S Grünendahl ,G Borissov ,A Sánchez-Hernández ,A Brandt ,P Baringer ,F Fiedler ,V E Bazterra ,M Kaur ,H E Fisk ,A Bean ,В Н Евдокимов ,X Lei ,A L Lyon ,M Corcoran ,D Li ,M Perfilov ,N Prokopenko ,V L Malyshev ,G Blazey ,J P Agnew ,A Popov ,W C Fisher ,D V Bandurin ,O Brandt ,H Nguyen ,A Harel ,K Harder ,B C Choudhary ,M P Sanders ,A K.a Maciel ,G Petrillo ,K Augsten ,Guillermo Reales Gutiérrez ,N Parashar ,Ashok Das ,J A García-González ,S W Youn ,M Begalli ,C Deterre ,X B Bu ,P Pétroff ,Y Liu ,J Qian ,L Živković

doi:10.1103/physrevd.95.011101

Abstract

We present a study of top quark polarization in $t \overline{t}$ events produced in $p \overline{p}$ collisions at $\sqrt{s}=1.96$ TeV. Data correspond to 9.7 fb$^{-1}$ collected with the D0 detector at the Tevatron. We use final states containing a lepton and at least three jets. The polarization is measured using the distribution of leptons along the beam and helicity axes, and the axis normal to the production plane. This is the first measurement of top quark polarization at the Tevatron in $\ell$+jets final states, and first measurement of transverse polarization in $t \overline{t}$ production. The observed distributions are consistent with the standard model.

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