Measurement of top quark-antiquark pair production in association with a W or Z boson in pp collisions at [Formula: see text][Formula: see text]

在 pp 碰撞中测量与 W 或 Z 玻色子相关的顶夸克-反夸克对产生 [公式：见正文][公式：见正文]

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作者：Khachatryan,V,Sirunyan,A M,Tumasyan,A,Adam,W,Bergauer,T,Dragicevic,M,Erö,J,Fabjan,C,Friedl,M,Frühwirth,R,Ghete,V M,Hartl,C,Hörmann,N,Hrubec,J,Jeitler,M,Kiesenhofer,W,Knünz,V,Krammer,M,Krätschmer,I,Liko,D,Mikulec,I,Rabady,D,Rahbaran,B,Rohringer,H,Schöfbeck,R,Strauss,J,Taurok,A,Treberer-Treberspurg,W,Waltenberger,W,Wulz,C-E,Mossolov,V,Shumeiko,N,Suarez Gonzalez,J,Alderweireldt,S,Bansal,M,Bansal,S,Cornelis,T,De Wolf,E A,Janssen,X,Knutsson,A,Luyckx,S,Ochesanu,S,Roland,B,Rougny,R,Van De Klundert,M,Van Haevermaet,H,Van Mechelen,P,Van Remortel,N,Van Spilbeeck,A,Blekman,F,Blyweert,S,D'Hondt,J,Daci,N,Heracleous,N,Keaveney,J,Lowette,S,Maes,M,Olbrechts,A,Python,Q,Strom,D,Tavernier,S,Van Doninck,W,Van Mulders,P,Van Onsem,G P,Villella,I,Caillol,C,Clerbaux,B,De Lentdecker,G,Dobur,D,Favart,L,Gay,A P R,Grebenyuk,A,Léonard,A,Mohammadi,A,Perniè,L,Reis,T,Seva,T,Thomas,L,Vander Velde,C,Vanlaer,P,Wang,J,Adler,V,Beernaert,K,Benucci,L,Cimmino,A,Costantini,S,Crucy,S,Dildick,S,Fagot,A,Garcia,G,Mccartin,J,Ocampo Rios,A A,Ryckbosch,D,Salva Diblen,S,Sigamani,M,Strobbe,N,Thyssen,F,Tytgat,M,Yazgan,E,Zaganidis,N,Basegmez,S,Beluffi,C,Bruno,G,Castello,R,Caudron,A,Ceard,L,Da Silveira,G G,Delaere,C,du Pree,T,Favart,D,Forthomme,L,Giammanco,A,Hollar,J,Jez,P,Komm,M,Lemaitre,V,Nuttens,C,Pagano,D,Perrini,L,Pin,A,Piotrzkowski,K,Popov,A,Quertenmont,L,Selvaggi,M,Vidal Marono,M,Vizan Garcia,J M,Beliy,N,Caebergs,T,Daubie,E,Hammad,G H,Júnior,W L Aldá,Alves,G A,Brito,L,Correa Martins Junior,M,Martins,T Dos Reis,Mora Herrera,C,Pol,M E,Carvalho,W,Chinellato,J,Custódio,A,Da Costa,E M,De Jesus Damiao,D,De Oliveira Martins,C,Fonseca De Souza,S,Malbouisson,H,Matos Figueiredo,D,Mundim,L,Nogima,H,Prado Da Silva,W L,Santaolalla,J,Santoro,A,Sznajder,A,Tonelli Manganote,E J,Vilela Pereira,A,Bernardes,C A,Dogra,S,Fernandez Perez Tomei,T R,Gregores,E M,Mercadante,P G,Novaes,S F,Padula,Sandra S,Aleksandrov,A,Genchev,V,Iaydjiev,P,Marinov,A,Piperov,S,Rodozov,M,Stoykova,S,Sultanov,G,Tcholakov,V,Vutova,M,Dimitrov,A,Glushkov,I,Hadjiiska,R,Kozhuharov,V,Litov,L,Pavlov,B,Petkov,P,Bian,J G,Chen,G M,Chen,H S,Chen,M,Du,R,Jiang,C H,Liang,S,Plestina,R,Tao,J,Wang,X,Wang,Z,Asawatangtrakuldee,C,Ban,Y,Guo,Y,Li,Q,Li,W,Liu,S,Mao,Y,Qian,S J,Wang,D,Zhang,L,Zou,W,Avila,C,Chaparro Sierra,L F,Florez,C,Gomez,J P,Gomez Moreno,B,Sanabria,J C,Godinovic,N,Lelas,D,Polic,D,Puljak,I,Antunovic,Z,Kovac,M,Brigljevic,V,Kadija,K,Luetic,J,Mekterovic,D,Sudic,L,Attikis,A,Mavromanolakis,G,Mousa,J,Nicolaou,C,Ptochos,F,Razis,P A,Bodlak,M,Finger,M,Finger,M Jr,Assran,Y,Ellithi Kamel,A,Mahmoud,M A,Radi,A,Kadastik,M,Murumaa,M,Raidal,M,Tiko,A,Eerola,P,Fedi,G,Voutilainen,M,Härkönen,J,Karimäki,V,Kinnunen,R,Kortelainen,M J,Lampén,T,Lassila-Perini,K,Lehti,S,Lindén,T,Luukka,P,Mäenpää,T,Peltola,T,Tuominen,E,Tuominiemi,J,Tuovinen,E,Wendland,L,Tuuva,T,Besancon,M,Couderc,F,Dejardin,M,Denegri,D,Fabbro,B,Faure,J 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Garay,Geiser,A,Gunnellini,P,Hauk,J,Hellwig,G,Hempel,M,Horton,D,Jung,H,Kalogeropoulos,A,Kasemann,M,Katsas,P,Kieseler,J,Kleinwort,C,Krücker,D,Lange,W,Leonard,J,Lipka,K,Lobanov,A,Lohmann,W,Lutz,B,Mankel,R,Marfin,I,Melzer-Pellmann,I-A,Meyer,A B,Mnich,J,Mussgiller,A,Naumann-Emme,S,Nayak,A,Novgorodova,O,Nowak,F,Ntomari,E,Perrey,H,Pitzl,D,Placakyte,R,Raspereza,A,Ribeiro Cipriano,P M,Ron,E,Sahin,M Ö,Salfeld-Nebgen,J,Saxena,P,Schmidt,R,Schoerner-Sadenius,T,Schröder,M,Seitz,C,Spannagel,S,Vargas Trevino,A D R,Walsh,R,Wissing,C,Aldaya Martin,M,Blobel,V,Centis Vignali,M,Draeger,A R,Erfle,J,Garutti,E,Goebel,K,Görner,M,Haller,J,Hoffmann,M,Höing,R S,Kirschenmann,H,Klanner,R,Kogler,R,Lange,J,Lapsien,T,Lenz,T,Marchesini,I,Ott,J,Peiffer,T,Pietsch,N,Poehlsen,J,Poehlsen,T,Rathjens,D,Sander,C,Schettler,H,Schleper,P,Schlieckau,E,Schmidt,A,Seidel,M,Sola,V,Stadie,H,Steinbrück,G,Troendle,D,Usai,E,Vanelderen,L,Barth,C,Baus,C,Berger,J,Böser,C,Butz,E,Chwalek,T,De 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A,Shoaib,M,Bialkowska,H,Bluj,M,Boimska,B,Frueboes,T,Górski,M,Kazana,M,Nawrocki,K,Romanowska-Rybinska,K,Szleper,M,Zalewski,P,Brona,G,Bunkowski,K,Cwiok,M,Dominik,W,Doroba,K,Kalinowski,A,Konecki,M,Krolikowski,J,Misiura,M,Olszewski,M,Wolszczak,W,Bargassa,P,Beirão Da Cruz E Silva,C,Faccioli,P,Ferreira Parracho,P G,Gallinaro,M,Nguyen,F,Rodrigues Antunes,J,Seixas,J,Varela,J,Vischia,P,Golutvin,I,Karjavin,V,Konoplyanikov,V,Korenkov,V,Kozlov,G,Lanev,A,Malakhov,A,Matveev,V,Mitsyn,V V,Moisenz,P,Palichik,V,Perelygin,V,Shmatov,S,Shulha,S,Skatchkov,N,Smirnov,V,Tikhonenko,E,Zarubin,A,Golovtsov,V,Ivanov,Y,Kim,V,Levchenko,P,Murzin,V,Oreshkin,V,Smirnov,I,Sulimov,V,Uvarov,L,Vavilov,S,Vorobyev,A,Vorobyev,An,Andreev,Yu,Dermenev,A,Gninenko,S,Golubev,N,Kirsanov,M,Krasnikov,N,Pashenkov,A,Tlisov,D,Toropin,A,Epshteyn,V,Gavrilov,V,Lychkovskaya,N,Popov,V,Safronov,G,Semenov,S,Spiridonov,A,Stolin,V,Vlasov,E,Zhokin,A,Andreev,V,Azarkin,M,Dremin,I,Kirakosyan,M,Leonidov,A,Mesyats,G,Rusakov,S 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期刊：European Physical Journal C影响因子：4.800
时间：2014起止号：2014;74(9):3060
doi：10.1140/epjc/s10052-014-3060-7

Abstract

A measurement of the cross section for the production of top quark-antiquark pairs ([Formula: see text]) in association with a vector boson V (W or Z) in proton-proton collisions at [Formula: see text][Formula: see text] is presented. The results are based on a dataset corresponding to an integrated luminosity of 19.5 fb[Formula: see text] recorded with the CMS detector at the LHC. The measurement is performed in three leptonic (e and [Formula: see text]) channels: a same-sign dilepton analysis targeting [Formula: see text] events, and trilepton and four-lepton analyses designed for [Formula: see text] events. In the same-sign dilepton channel, the [Formula: see text] cross section is measured as [Formula: see text], corresponding to a significance of 1.6 standard deviations over the background-only hypothesis. Combining the trilepton and four-lepton channels, a direct measurement of the [Formula: see text] cross section, [Formula: see text], is obtained with a significance of 3.1 standard deviations. The measured cross sections are compatible with standard model predictions within their experimental uncertainties. The inclusive [Formula: see text] process is observed with a significance of 3.7 standard deviations from the combination of all three leptonic channels.

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