Measurement of B(t→Wb)/B(t→Wq) in top-quark-pair decays using dilepton events and the full CDF Run II data set. T Aaltonen , S Amerio , D Amidei , A Anastassov , A Annovi , J Antos , G Apollinari , J A Appel , T Arisawa , A Artikov , J Asaadi , W Ashmanskas , B Auerbach , A Aurisano , F Azfar , W Badgett , T Bae , A Barbaro-Galtieri , V E Barnes , B A Barnett , P Barria , P Bartos , M Bauce , F Bedeschi , S Behari , G Bellettini , J Bellinger , D Benjamin , A Beretvas , A Bhatti , K R Bland , B Blumenfeld , A Bocci , A Bodek , D Bortoletto , J Boudreau , A Boveia , L Brigliadori , C Bromberg , E Brucken , J Budagov , H S Budd , K Burkett , G Busetto , P Bussey , P Butti , A Buzatu , A Calamba , S Camarda , M Campanelli , F Canelli , B Carls , D Carlsmith , R Carosi , S Carrillo , B Casal , M Casarsa , A Castro , P Catastini , D Cauz , V Cavaliere , M Cavalli-Sforza , A Cerri , L Cerrito , Y C Chen , M Chertok , G Chiarelli , G Chlachidze , K Cho , D Chokheli , A Clark , C Clarke , M E Convery , J Conway , M Corbo , M Cordelli , C A Cox , D J Cox , M Cremonesi , D Cruz , J Cuevas , R Culbertson , N d'Ascenzo , M Datta , P de Barbaro , L Demortier , M Deninno , M D'Errico , F Devoto , A Di Canto , B Di Ruzza , J R Dittmann , S Donati , M D'Onofrio , M Dorigo , A Driutti , K Ebina , R Edgar , A Elagin , R Erbacher , S Errede , B Esham , S Farrington , J P Fernández Ramos , R Field , G Flanagan , R Forrest , M Franklin , J C Freeman , H Frisch , Y Funakoshi , C Galloni , A F Garfinkel , P Garosi , H Gerberich , E Gerchtein , S Giagu , V Giakoumopoulou , K Gibson , C M Ginsburg , N Giokaris , P Giromini , G Giurgiu , V Glagolev , D Glenzinski , M Gold , D Goldin , A Golossanov , G Gomez , G Gomez-Ceballos , M Goncharov , O González López , I Gorelov , A T Goshaw , K Goulianos , E Gramellini , S Grinstein , C Grosso-Pilcher , R C Group , J Guimaraes da Costa , S R Hahn , J Y Han , F Happacher , K Hara , M Hare , R F Harr , T Harrington-Taber , K Hatakeyama , C Hays , J Heinrich , M Herndon , A Hocker , Z Hong , W Hopkins , S Hou , R E Hughes , U Husemann , M Hussein , J Huston , G Introzzi , M Iori , A Ivanov , E James , D Jang , B Jayatilaka , E J Jeon , S Jindariani , M Jones , K K Joo , S Y Jun , T R Junk , M Kambeitz , T Kamon , P E Karchin , A Kasmi , Y Kato , W Ketchum , J Keung , B Kilminster , D H Kim , H S Kim , J E Kim , M J Kim , S H Kim , S B Kim , Y J Kim , Y K Kim , N Kimura , M Kirby , K Knoepfel , K Kondo , D J Kong , J Konigsberg , A V Kotwal , M Kreps , J Kroll , M Kruse , T Kuhr , M Kurata , A T Laasanen , S Lammel , M Lancaster , K Lannon , G Latino , H S Lee , J S Lee , S Leo , S Leone , J D Lewis , A Limosani , E Lipeles , A Lister , H Liu , Q Liu , T Liu , S Lockwitz , A Loginov , D Lucchesi , A Lucà , J Lueck , P Lujan , P Lukens , G Lungu , J Lys , R Lysak , R Madrak , P Maestro , S Malik , G Manca , A Manousakis-Katsikakis , L Marchese , F Margaroli , P Marino , M Martínez , K Matera , M E Mattson , A Mazzacane , P Mazzanti , R McNulty , A Mehta , P Mehtala , C Mesropian , T Miao , D Mietlicki , A Mitra , H Miyake , S Moed , N Moggi , C S Moon , R Moore , M J Morello , A Mukherjee , Th Muller , P Murat , M Mussini , J Nachtman , Y Nagai , J Naganoma , I Nakano , A Napier , J Nett , C Neu , T Nigmanov , L Nodulman , S Y Noh , O Norniella , L Oakes , S H Oh , Y D Oh , I Oksuzian , T Okusawa , R Orava , L Ortolan , C Pagliarone , E Palencia , P Palni , V Papadimitriou , W Parker , G Pauletta , M Paulini , C Paus , T J Phillips , G Piacentino , E Pianori , J Pilot , K Pitts , C Plager , L Pondrom , S Poprocki , K Potamianos , A Pranko , F Prokoshin , F Ptohos , G Punzi , N Ranjan , I Redondo Fernández , P Renton , M Rescigno , F Rimondi , L Ristori , A Robson , T Rodriguez , S Rolli , M Ronzani , R Roser , J L Rosner , F Ruffini , A Ruiz , J Russ , V Rusu , W K Sakumoto , Y Sakurai , L Santi , K Sato , V Saveliev , A Savoy-Navarro , P Schlabach , E E Schmidt , T Schwarz , L Scodellaro , F Scuri , S Seidel , Y Seiya , A Semenov , F Sforza , S Z Shalhout , T Shears , P F Shepard , M Shimojima , M Shochet , I Shreyber-Tecker , A Simonenko , K Sliwa , J R Smith , F D Snider , H Song , V Sorin , R St Denis , M Stancari , D Stentz , J Strologas , Y Sudo , A Sukhanov , I Suslov , K Takemasa , Y Takeuchi , J Tang , M Tecchio , P K Teng , J Thom , E Thomson , V Thukral , D Toback , S Tokar , K Tollefson , T Tomura , D Tonelli , S Torre , D Torretta , P Totaro , M Trovato , F Ukegawa , S Uozumi , F Vázquez , G Velev , C Vellidis , C Vernieri , M Vidal , R Vilar , J Vizán , M Vogel , G Volpi , P Wagner , R Wallny , S M Wang , D Waters , W C Wester , D Whiteson , A B Wicklund , S Wilbur , H H Williams , J S Wilson , P Wilson , B L Winer , P Wittich , S Wolbers , H Wolfe , T Wright , X Wu , Z Wu , K Yamamoto , D Yamato , T Yang , U K Yang , Y C Yang , W-M Yao , G P Yeh , K Yi , J Yoh , K Yorita , T Yoshida , G B Yu , I Yu , A M Zanetti , Y Zeng , C Zhou , S Zucchelli Physical review letters（2014）
摘要
We present a measurement of the ratio of the top-quark branching fractions R=B(t→Wb)/B(t→Wq), where q represents any quark flavor, in events with two charged leptons, imbalance in total transverse energy, and at least two jets. The measurement uses proton-antiproton collision data at center-of-mass energy 1.96 TeV, corresponding to an integrated luminosity of 8.7 fb^{-1} collected with the Collider Detector at Fermilab during Run II of the Tevatron. We measure R to be 0.87±0.07, and extract the magnitude of the top-bottom quark coupling to be |V_{tb}|=0.93±0.04, assuming three generations of quarks. Under these assumptions, a lower limit of |V_{tb}|>0.85(0.87) at 95% (90%) credibility level is set.
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