Measurement oftt¯spin correlation inpp¯collisions using the CDF II detector at the Tevatron

T Aaltonen,S Grinstein,A Sfyrla,E Wicklund,Y D Oh,S Zucchelli,T Wakisaka,T J Phillips,R Madrak,L Cerrito,M Corbo,P Garosi,A Artikov,S Giagu,D Chokheli,G Piacentino,Z Gunay-Unalan,M Casarsa,K Goulianos,D Amidei,G A Thompson,M Jones,A Buzatu,Y Nagai,S Tkaczyk,B Kilminster,W K Sakumoto,P Mazzanti,P Lukens,T Kamon,A Lath,C Plager,R Vilar,L Sartori,M Stancari,Y Funakoshi,R Mcnulty,J Keung,A Mukherjee,S De Cecco,A Warburton,D Mietlicki,A Hamaguchi,P Murat,E Halkiadakis,J Morlock,R Wallny,N D’Ascenzo,C S Moon,N Ranjan,B Di Ruzza,H S Kim,A Brisuda,J Cuevas,P Sinervo,O González,J Bellinger,K Sliwa,S Lockwitz,A Boveia,K Makhoul,L Nodulman,C Paus,M Datta,G Volpi,T Dorigo,P Squillacioti,K S Mcfarland,D Torretta,K Tollefson,D Carlsmith,P Giromini,P Totaro,B A Barnett,M Vidal,M Lancaster,D Goldin,B Casal,D Dagenhart,R Culbertson,M Chertok,S Kwang,J Budagov,C Pagliarone,J Kroll,A Eppig,M Rossi,T Kuhr,G Bauer,F Canelli,M Tecchio,J A Appel,J Nett,R Forrest,M Schmitt,M S Neubauer,S Uozumi,J Heinrich,H C Fang,G Pauletta,L Ortolan,G Introzzi,Y S Chung,H Miyake,X Wu,C Ferrazza,W Ketchum,R St Denis,J Thom,M J Kim,T Tomura,J P Chou,K K Joo,F Ptohos,A Loginov,A Soha,S Lammel,L Oakes,G Lungu,S Rolli,F Margaroli,E E Schmidt,M K Jha,E Nurse,P Catastini,I Oksuzian,L Scodellaro,L Brigliadori,Y Takeuchi,N Moggi,A Sedov,A Manousakis-Katsikakis,D Cauz,F Vázquez,J Huston,D Stentz,S Klimenko,E Thomson,K Ebina,S Amerio,K R Bland,S R Hahn,G Busetto,M Dell’Orso,D Krop,N Goldschmidt,M Hare,S Torre,B Brau,T R Junk,C M Ginsburg,F Bedeschi,Y Seiya,A Ruiz,P Dong,M Hurwitz,L Pondrom,J D Lewis,S Errede,P Mcintyre,J Lys,J Deng,A Mehta,M Martínez,T Shears,C A Cox,R Roser,C Bromberg,A T Laasanen,F Devoto,M Kirby,C Mesropian,F Crescioli,G L Strycker,V Papadimitriou,N Kimura,M Deninno,L Santi,F Azfar,M Cordelli,D Errede,F Ruffini,M Campanelli,W Badgett,M Kurata,I Shreyber,A T Goshaw,M J Morello,E Palencia,D Tonelli,M Gallinaro,J Patrick,C Deluca,M Shimojima,G B Yu,J E Kim,P Ttito-Guzmán,M Heck,S Leone,M Gold,C Cuenca Almenar,W Ashmanskas,S Donati,T Wright,Y Zeng,R Orava,H Wolfe,K Gibson,A B Wicklund,P K Teng,A Aurisano,P Movilla Fernandez,M Giunta,P Wilson,A Zanetti,C Vellidis,W C Wester,A Anastassov,M Dorigo,A Canepa,C Neu,A Scribano,P Wittich,I Vila,D Waters,W Hopkins,E James,D J Kong,F Rimondi,D O Litvintsev,D Bisello,E Gerchtein,G Punzi,C Haber,J Thome,S Behari,R Moore,E Lee,G P Yeh,J Galyardt,N Giokaris,M Franklin,I Lazzizzera,G Compostella,M Weinberger,J Boudreau,P F Shepard,D J Cox,R L Wagner,M J Frank,A Pronko,G Manca,A Semenov,D Beecher,G Giurgiu,L Demortier,T Rodriguez,Y K Kim,S Malik,W Johnson,S Lami,P E Karchin,R Eusebi,P Wagner,M D’Onofrio,U K Yang,G Apollinari,G Velev,M Mathis,H Gerberich,P Renton,A Ivanov,F D Snider,A Rahaman,E J Jeon,S Wolbers,S Shiraishi,S Leo,Y C Chen,S Somalwar,J Conway,T Miao,S S Yu,S Carrillo,J Yoh,N Hussain,M Campbell,J C Yun,J Pilot,R Carosi,F Happacher,G De Lorenzo,T Okusawa,Q Liu,E Pueschel,V Saveliev,B Stelzer,I Bizjak,B Whitehouse,Y Kato,A Di Canto,W H Chung,C Grosso-Pilcher,G Flanagan,D Glenzinski,M Binkley,D Lucchesi,M Lindgren,O Norniella,E Pianori,S H Oh,J Asaadi,A Menzione,F Wick,G Chlachidze,A Bhatti,J Pursley,J Nielsen,K Kondo,K Burkett,F Scuri,J Yamaoka,S W Lee,Y Sakurai,P Schlabach,M Bucciantonio,H H Williams,M Rescigno,M Paulini,M Hussein,A Mitra,M E Mattson,A Napier,B Carls,J Lueck,A Elagin,F Rubbo,M P Schmidt,V Rusu,O Poukhov,A Bodek,A Golossanov,A Safonov,E Lipeles,M Iori,D Toback,A Varganov,N Ershaidat,V Ramakrishnan,F Chlebana,B Álvarez González,S H Kim,N Krumnack,K Takemasa,C I Ciobanu,K Potamianos,B Auerbach,A Gresele,A Robson,M Mussini,M Feindt,S Pagan Griso,H S Budd,S Y Jun,C Calancha,J Naganoma,P De Barbaro,Y Sudo,S Carron,V Khotilovich,S Budd,N S Lockyer,K Yamamoto,R Erbacher,K Pitts,P Mehtälä ,B Jayatilaka,D Whiteson,P Mastrandrea,E Rogers,A Castro,S M Farrington ,B Blumenfeld,S Camarda,L Ristori,S Tokár ,A Penzo,A Annovi,I Yu,M Kreps,Y Tu,D Benjamin,R D Field ,V Glagolev,B L Winer,D Hare,G Gómez-Ceballos ,А Симоненко ,G Chiarelli,V Sorı́n ,P Lujan,A Schmidt,C Liu,T Arisawa,V E Barnes,P Barria,F Ukegawa,T Yoshida,M Stanitzki,A Bocci,J Russ,M N Mondragón ,S M Wang,T Rodrigo,F Prokoshin,H S Lee,A Barbaro‐Galtieri ,J Königsberg ,R Lander ,I Gorelov,Thomas Schwarz ,K Lannon,R Lysák ,D H Kim,C P Hays ,P Bartoš ,K Sato,U Husemann,K Yi,S Hewamanage,P Giannetti,D Hidas,S Hou,Z Wu,A F Garfinkel,J Antos̆ ,J E Garcia,M Kruse,M A Ciocci,J Strologas,A Paramonov ,J S Wilson,I Redondo,S Jindariani,S C Seidel ,K Hara,Yang Yu ,C J Lin ,A Savoy-Navarro,M Herndon,M J Shochet ,R Mart́ínez-Ballaŕın ,K Cho,A Beretvas,S Wilbur,D Pellett ,J Nachtman,P Bussey,M D’Errico,A Höcker ,T Liu,M E Convery,H W Kim,T Lecompte,I Nakano,V Krutelyov,W-M Yao ,P Maksimović ,S B Kim,J Freeman ,R Hughes ,V Giakoumopoulou,M Bauce,G Latino,A Apresyan,D Jang,R Harr ,А Суханов ,J P Fernández ,J R Smith,K Maeshima,I K Furic ,J Guimarães Da Costa ,J Dittmann ,M Goncharov,J Linacre,David Horn ,И Суслов ,J Tang,A Kotwal ,A Lister,A Clark,O Stelzer-Chilton,J S Lee,E Brücken ,Tianyi Yang ,G Gómez ,A Cerri,A Sissakian,M Vogel,G Bellettini,F Sforza,V Cavaliere,M Trovato,S Moêd ,C Marino,J Han ,M Cavalli‐Sforza ,K Hatakeyama,Th Müller ,S Shalhout ,K Yorita,D Bortoletto

doi:10.1103/physrevd.83.031104

Abstract

The ttbar spin correlation at production is a fundamental prediction of QCD and a potentially incisive test of new physics coupled to top quarks. We measure the ttbar spin state in ppbar collisions at sqrt(s) = 1.96 TeV using 1001 candidate events in the lepton plus jets decay channel reconstructed in the CDF II detector. In the helicity basis, for a top-quark mass of 172.5 GeV/c^2, we find a spin correlation coefficient kappa = 0.60 +/- 0.50 (stat) +/- 0.16 (syst), consistent with the QCD prediction, kappa ~= 0.40.

Full Text