Search for standard model production of four top quarks with same-sign and multilepton final states in proton-proton collisions at [Formula: see text]

在质子-质子碰撞中寻找标准模型产生四个同号和多轻子末态的顶夸克 [公式：见正文]

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作者：Sirunyan,A M,Tumasyan,A,Adam,W,Ambrogi,F,Asilar,E,Bergauer,T,Brandstetter,J,Brondolin,E,Dragicevic,M,Erö,J,Escalante Del Valle,A,Flechl,M,Friedl,M,Frühwirth,R,Ghete,V M,Grossmann,J,Hrubec,J,Jeitler,M,König,A,Krammer,N,Krätschmer,I,Liko,D,Madlener,T,Mikulec,I,Pree,E,Rad,N,Rohringer,H,Schieck,J,Schöfbeck,R,Spanring,M,Spitzbart,D,Taurok,A,Waltenberger,W,Wittmann,J,Wulz,C-E,Zarucki,M,Chekhovsky,V,Mossolov,V,Suarez Gonzalez,J,De Wolf,E A,Di Croce,D,Janssen,X,Lauwers,J,Van De Klundert,M,Van Haevermaet,H,Van Mechelen,P,Van Remortel,N,Abu Zeid,S,Blekman,F,D'Hondt,J,De Bruyn,I,De Clercq,J,Deroover,K,Flouris,G,Lontkovskyi,D,Lowette,S,Marchesini,I,Moortgat,S,Moreels,L,Python,Q,Skovpen,K,Tavernier,S,Van Doninck,W,Van Mulders,P,Van Parijs,I,Beghin,D,Bilin,B,Brun,H,Clerbaux,B,De Lentdecker,G,Delannoy,H,Dorney,B,Fasanella,G,Favart,L,Goldouzian,R,Grebenyuk,A,Kalsi,A K,Lenzi,T,Luetic,J,Maerschalk,T,Marinov,A,Seva,T,Starling,E,Vander Velde,C,Vanlaer,P,Vannerom,D,Yonamine,R,Zenoni,F,Cornelis,T,Dobur,D,Fagot,A,Gul,M,Khvastunov,I,Poyraz,D,Roskas,C,Salva,S,Trocino,D,Tytgat,M,Verbeke,W,Zaganidis,N,Bakhshiansohi,H,Bondu,O,Brochet,S,Bruno,G,Caputo,C,Caudron,A,David,P,De Visscher,S,Delaere,C,Delcourt,M,Francois,B,Giammanco,A,Komm,M,Krintiras,G,Lemaitre,V,Magitteri,A,Mertens,A,Musich,M,Piotrzkowski,K,Quertenmont,L,Saggio,A,Vidal Marono,M,Wertz,S,Zobec,J,Aldá Júnior,W L,Alves,F L,Alves,G A,Brito,L,Correia Silva,G,Hensel,C,Moraes,A,Pol,M E,Rebello Teles,P,Belchior Batista Das Chagas,E,Carvalho,W,Chinellato,J,Coelho,E,Da Costa,E M,Da Silveira,G G,De Jesus Damiao,D,Fonseca De Souza,S,Huertas Guativa,L M,Malbouisson,H,Melo De Almeida,M,Mora Herrera,C,Mundim,L,Nogima,H,Sanchez Rosas,L J,Santoro,A,Sznajder,A,Thiel,M,Tonelli Manganote,E J,Torres Da Silva De Araujo,F,Vilela Pereira,A,Ahuja,S,Bernardes,C A,Fernandez Perez Tomei,T R,Gregores,E M,Mercadante,P G,Novaes,S F,Padula,Sandra S,Romero Abad,D,Ruiz Vargas,J C,Aleksandrov,A,Hadjiiska,R,Iaydjiev,P,Misheva,M,Rodozov,M,Shopova,M,Sultanov,G,Dimitrov,A,Litov,L,Pavlov,B,Petkov,P,Fang,W,Gao,X,Yuan,L,Ahmad,M,Bian,J G,Chen,G M,Chen,H S,Chen,M,Chen,Y,Jiang,C H,Leggat,D,Liao,H,Liu,Z,Romeo,F,Shaheen,S M,Spiezia,A,Tao,J,Wang,C,Wang,Z,Yazgan,E,Yu,T,Zhang,H,Zhao,J,Ban,Y,Chen,G,Li,J,Li,Q,Liu,S,Mao,Y,Qian,S J,Wang,D,Xu,Z,Zhang,F,Wang,Y,Avila,C,Cabrera,A,Chaparro Sierra,L F,Florez,C,González Hernández,C F,Ruiz Alvarez,J D,Segura Delgado,M A,Courbon,B,Godinovic,N,Lelas,D,Puljak,I,Ribeiro Cipriano,P M,Sculac,T,Antunovic,Z,Kovac,M,Brigljevic,V,Ferencek,D,Kadija,K,Mesic,B,Starodumov,A,Susa,T,Ather,M W,Attikis,A,Mavromanolakis,G,Mousa,J,Nicolaou,C,Ptochos,F,Razis,P A,Rykaczewski,H,Finger,M,Finger,M Jr,Carrera Jarrin,E,Assran,Y,Elgammal,S,Mahrous,A,Bhowmik,S,Dewanjee,R K,Kadastik,M,Perrini,L,Raidal,M,Tiko,A,Veelken,C,Eerola,P,Kirschenmann,H,Pekkanen,J,Voutilainen,M,Havukainen,J,Heikkilä,J K,Järvinen,T,Karimäki,V,Kinnunen,R,Lampén,T,Lassila-Perini,K,Laurila,S,Lehti,S,Lindén,T,Luukka,P,Mäenpää,T,Siikonen,H,Tuominen,E,Tuominiemi,J,Tuuva,T,Besancon,M,Couderc,F,Dejardin,M,Denegri,D,Faure,J L,Ferri,F,Ganjour,S,Ghosh,S,Givernaud,A,Gras,P,Hamel de Monchenault,G,Jarry,P,Kucher,I,Leloup,C,Locci,E,Machet,M,Malcles,J,Negro,G,Rander,J,Rosowsky,A,Sahin,M Ö,Titov,M,Abdulsalam,A,Amendola,C,Antropov,I,Baffioni,S,Beaudette,F,Busson,P,Cadamuro,L,Charlot,C,Granier de Cassagnac,R,Jo,M,Lisniak,S,Lobanov,A,Martin Blanco,J,Nguyen,M,Ochando,C,Ortona,G,Paganini,P,Pigard,P,Salerno,R,Sauvan,J B,Sirois,Y,Stahl Leiton,A G,Strebler,T,Yilmaz,Y,Zabi,A,Zghiche,A,Agram,J-L,Andrea,J,Bloch,D,Brom,J-M,Buttignol,M,Chabert,E C,Chanon,N,Collard,C,Conte,E,Coubez,X,Drouhin,F,Fontaine,J-C,Gelé,D,Goerlach,U,Jansová,M,Juillot,P,Le Bihan,A-C,Tonon,N,Van Hove,P,Gadrat,S,Beauceron,S,Bernet,C,Boudoul,G,Chierici,R,Contardo,D,Depasse,P,El Mamouni,H,Fay,J,Finco,L,Gascon,S,Gouzevitch,M,Grenier,G,Ille,B,Lagarde,F,Laktineh,I 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期刊：European Physical Journal C影响因子：4.800
时间：2018起止号：2018;78(2):140
doi：10.1140/epjc/s10052-018-5607-5

Abstract

A search for standard model production of four top quarks ( tt¯tt¯ ) is reported using events containing at least three leptons ( e, μ ) or a same-sign lepton pair. The events are produced in proton-proton collisions at a center-of-mass energy of 13 TeV at the LHC, and the data sample, recorded in 2016, corresponds to an integrated luminosity of 35.9 fb-1 . Jet multiplicity and flavor are used to enhance signal sensitivity, and dedicated control regions are used to constrain the dominant backgrounds. The observed and expected signal significances are, respectively, 1.6 and 1.0 standard deviations, and the tt¯tt¯ cross section is measured to be 16.9-11.4+13.8 fb , in agreement with next-to-leading-order standard model predictions. These results are also used to constrain the Yukawa coupling between the top quark and the Higgs boson to be less than 2.1 times its expected standard model value at 95% confidence level.

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