Observation of the production of a W boson in association with a single charm quark. 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 , 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 , J P Chou , D Chokheli , A Clark , C Clarke , M E Convery , J Conway , M Corbo , M Cordelli , C A Cox , D J Cox , M Cremonesi , J Cuevas , R Culbertson , N d'Ascenzo , M Datta , L Demortier , M Deninno , F Devoto , M d'Errico , A Di Canto , B Di Ruzza , J R Dittmann , M D'Onofrio , S Donati , M Dorigo , A Driutti , K Ebina , R Edgar , A Elagin , R Erbacher , S Errede , B Esham , R Eusebi , S Farrington , J P Fernández Ramos , R Field , G Flanagan , R Forrest , M Franklin , J C Freeman , Y Funakoshi , 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 , N Goldschmidt , 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 , W Hopkins , S Hou , R E Hughes , M Hurwitz , U Husemann , 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 B Kim , S H Kim , Y K Kim , Y J Kim , N Kimura , M Kirby , S Klimenko , K Knoepfel , K Kondo , D J Kong , J Konigsberg , A V Kotwal , M Kreps , J Kroll , D Krop , M Kruse , T Kuhr , M Kurata , S Kwang , A T Laasanen , S Lammel , M Lancaster , K Lannon , G Latino , H S Lee , J S Lee , S Leone , J D Lewis , A Limosani , E Lipeles , H Liu , Q Liu , T Liu , S Lockwitz , A Loginov , D Lucchesi , J Lueck , P Lujan , P Lukens , G Lungu , J Lys , R Lysak , R Madrak , P Maestro , S Malik , G Manca , A Manousakis-Katsikakis , F Margaroli , 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 , F Prokoshin , A Pranko , F Ptohos , G Punzi , N Ranjan , I Redondo Fernández , P Renton , M Rescigno , T Riddick , 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 , A Safonov , W K Sakumoto , Y Sakurai , L Santi , K Sato , V Saveliev , A Savoy-Navarro , P Schlabach , E E Schmidt , T Schwarz , L Scodellaro , 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 , P Sinervo , K Sliwa , J R Smith , F D Snider , V Sorin , H Song , M Stancari , R St Denis , B Stelzer , O Stelzer-Chilton , 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 , 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 , A Warburton , 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（2013）
摘要
The first observation of the production of a W boson with a single charm quark (c) jet in pp[over ¯] collisions at √s=1.96 TeV is reported. The analysis uses data corresponding to 4.3 fb(-1), recorded with the CDF II detector at the Fermilab Tevatron. Charm quark candidates are selected through the identification of an electron or muon from charm-hadron semileptonic decay within a hadronic jet, and a Wc signal is observed with a significance of 5.7 standard deviations. The production cross section σ(Wc)(p(Tc)>20 GeV/c,|η(c)|<1.5)×B(W→ℓν) is measured to be 13.6(-3.1)(+3.4) pb and is in agreement with theoretical expectations. From this result the magnitude of the quark-mixing matrix element V(cs) is derived, |V(cs)|=1.08±0.16 along with a lower limit of |V(cs)|>0.71 at the 95% confidence level, assuming that the Wc production through c to s quark coupling is dominant.
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a<mmlmath xmlnsmml=http//wwww3org/1998/math/mathml, display=inline><mmlmi>w</mmlmi></mmlmath>boson
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