Measurements of the pp → ZZ production cross section and the Z → 4ℓ branching fraction, and constraints on anomalous triple gauge couplings at [Formula: see text]

pp → ZZ 产生截面和 Z → 4ℓ 分支比的测量，以及对 [公式：见正文] 处异常三重规范耦合的限制

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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,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,Rabady,D,Rad,N,Rohringer,H,Schieck,J,Schöfbeck,R,Spanring,M,Spitzbart,D,Waltenberger,W,Wittmann,J,Wulz,C-E,Zarucki,M,Chekhovsky,V,Mossolov,V,Gonzalez,J Suarez,De Wolf,E A,Di Croce,D,Janssen,X,Lauwers,J,Van De Klundert,M,Van Haevermaet,H,Van Mechelen,P,Van Remortel,N,Zeid,S Abu,Blekman,F,D'Hondt,J,De Bruyn,I,De Clercq,J,Deroover,K,Flouris,G,Lontkovskyi,D,Lowette,S,Moortgat,S,Moreels,L,Python,Q,Skovpen,K,Tavernier,S,Van Doninck,W,Van Mulders,P,Van Parijs,I,Brun,H,Clerbaux,B,De Lentdecker,G,Delannoy,H,Fasanella,G,Favart,L,Goldouzian,R,Grebenyuk,A,Karapostoli,G,Lenzi,T,Luetic,J,Maerschalk,T,Marinov,A,Randle-Conde,A,Seva,T,Velde,C Vander,Vanlaer,P,Vannerom,D,Yonamine,R,Zenoni,F,Zhang,F,Cimmino,A,Cornelis,T,Dobur,D,Fagot,A,Gul,M,Khvastunov,I,Poyraz,D,Roskas,C,Salva,S,Tytgat,M,Verbeke,W,Zaganidis,N,Bakhshiansohi,H,Bondu,O,Brochet,S,Bruno,G,Caputo,C,Caudron,A,De Visscher,S,Delaere,C,Delcourt,M,Francois,B,Giammanco,A,Jafari,A,Komm,M,Krintiras,G,Lemaitre,V,Magitteri,A,Mertens,A,Musich,M,Piotrzkowski,K,Quertenmont,L,Marono,M Vidal,Wertz,S,Beliy,N,Aldá Júnior,W L,Alves,F L,Alves,G A,Brito,L,Martins Junior,M Correa,Hensel,C,Moraes,A,Pol,M E,Teles,P Rebello,Das Chagas,E Belchior Batista,Carvalho,W,Chinellato,J,Custódio,A,Da Costa,E M,Da Silveira,G G,De Jesus Damiao,D,De Souza,S Fonseca,Guativa,L M Huertas,Malbouisson,H,De Almeida,M Melo,Herrera,C Mora,Mundim,L,Nogima,H,Santoro,A,Sznajder,A,Manganote,E J Tonelli,Da Silva De Araujo,F Torres,Pereira,A Vilela,Ahuja,S,Bernardes,C A,Tomei,T R Fernandez Perez,Gregores,E M,Mercadante,P G,Novaes,S F,Padula,Sandra S,Abad,D Romero,Vargas,J C 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K,Kadastik,M,Perrini,L,Raidal,M,Tiko,A,Veelken,C,Eerola,P,Pekkanen,J,Voutilainen,M,Härkönen,J,Järvinen,T,Karimäki,V,Kinnunen,R,Lampén,T,Lassila-Perini,K,Lehti,S,Lindén,T,Luukka,P,Tuominen,E,Tuominiemi,J,Tuovinen,E,Talvitie,J,Tuuva,T,Besancon,M,Couderc,F,Dejardin,M,Denegri,D,Faure,J L,Ferri,F,Ganjour,S,Ghosh,S,Givernaud,A,Gras,P,de Monchenault,G Hamel,Jarry,P,Kucher,I,Locci,E,Machet,M,Malcles,J,Negro,G,Rander,J,Rosowsky,A,Sahin,M Ö,Titov,M,Abdulsalam,A,Antropov,I,Baffioni,S,Beaudette,F,Busson,P,Cadamuro,L,Charlot,C,de Cassagnac,R Granier,Jo,M,Lisniak,S,Lobanov,A,Blanco,J Martin,Nguyen,M,Ochando,C,Ortona,G,Paganini,P,Pigard,P,Regnard,S,Salerno,R,Sauvan,J B,Sirois,Y,Leiton,A G Stahl,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,Fontaine,J-C,Gelé,D,Goerlach,U,Jansová,M,Bihan,A-C Le,Tonon,N,Van Hove,P,Gadrat,S,Beauceron,S,Bernet,C,Boudoul,G,Chierici,R,Contardo,D,Depasse,P,El 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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):165
doi：10.1140/epjc/s10052-018-5567-9

Abstract

Four-lepton production in proton-proton collisions, pp → (Z/γ∗)(Z/γ∗) → 4ℓ , where ℓ = e or μ , is studied at a center-of-mass energy of 13 TeV with the CMS detector at the LHC. The data sample corresponds to an integrated luminosity of 35.9 fb-1 . The ZZ production cross section, σ(pp → ZZ) = 17.2 ± 0.5 (stat) ± 0.7 (syst) ± 0.4 (theo) ± 0.4 (lumi) pb , measured using events with two opposite-sign, same-flavor lepton pairs produced in the mass region 60 < mℓ+ℓ- < 120 GeV , is consistent with standard model predictions. Differential cross sections are measured and are well described by the theoretical predictions. The Z boson branching fraction to four leptons is measured to be B(Z → 4ℓ) = 4.83-0.22+0.23(stat)-0.29+0.32(syst) ± 0.08(theo) ± 0.12(lumi) × 10-6 for events with a four-lepton invariant mass in the range 80 < m4ℓ < 100 GeV and a dilepton mass mℓℓ > 4 GeV for all opposite-sign, same-flavor lepton pairs. The results agree with standard model predictions. The invariant mass distribution of the four-lepton system is used to set limits on anomalous ZZZ and ZZ γ couplings at 95% confidence level: - 0.0012 < f4Z < 0.0010 , - 0.0010 < f5Z < 0.0013 , - 0.0012 < f4γ < 0.0013 , - 0.0012 < f5γ < 0.0013 .

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