Measurement of double-differential cross sections for top quark pair production in pp collisions at [Formula: see text][Formula: see text] and impact on parton distribution functions

在[公式：见正文][公式：见正文]处测量pp碰撞中顶夸克对产生的双微分截面及其对部分子分布函数的影响

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作者：Sirunyan,A M,Tumasyan,A,Adam,W,Asilar,E,Bergauer,T,Brandstetter,J,Brondolin,E,Dragicevic,M,Erö,J,Flechl,M,Friedl,M,Frühwirth,R,Ghete,V M,Hartl,C,Hörmann,N,Hrubec,J,Jeitler,M,König,A,Krätschmer,I,Liko,D,Matsushita,T,Mikulec,I,Rabady,D,Rad,N,Rahbaran,B,Rohringer,H,Schieck,J,Strauss,J,Waltenberger,W,Wulz,C-E,Dvornikov,O,Makarenko,V,Mossolov,V,Suarez Gonzalez,J,Zykunov,V,Shumeiko,N,Alderweireldt,S,De Wolf,E A,Janssen,X,Lauwers,J,Van De Klundert,M,Van Haevermaet,H,Van Mechelen,P,Van Remortel,N,Van Spilbeeck,A,Abu Zeid,S,Blekman,F,D'Hondt,J,Daci,N,De Bruyn,I,Deroover,K,Lowette,S,Moortgat,S,Moreels,L,Olbrechts,A,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,Léonard,A,Luetic,J,Maerschalk,T,Marinov,A,Randle-Conde,A,Seva,T,Vander Velde,C,Vanlaer,P,Vannerom,D,Yonamine,R,Zenoni,F,Zhang,F,Cornelis,T,Dobur,D,Fagot,A,Gul,M,Khvastunov,I,Poyraz,D,Salva,S,Schöfbeck,R,Tytgat,M,Van Driessche,W,Yazgan,E,Zaganidis,N,Bakhshiansohi,H,Bondu,O,Brochet,S,Bruno,G,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,Selvaggi,M,Vidal Marono,M,Wertz,S,Beliy,N,Aldá Júnior,W L,Alves,F L,Alves,G A,Brito,L,Hensel,C,Moraes,A,Pol,M E,Rebello Teles,P,Chagas,E Belchior Batista Das,Carvalho,W,Chinellato,J,Custódio,A,Da Costa,E M,Da Silveira,G G,De Jesus Damiao,D,De Oliveira Martins,C,De Souza,S Fonseca,Guativa,L M Huertas,Malbouisson,H,Matos Figueiredo,D,Mora Herrera,C,Mundim,L,Nogima,H,Prado Da Silva,W L,Santoro,A,Sznajder,A,Tonelli Manganote,E J,Torres Da Silva De Araujo,F,Vilela Pereira,A,Ahuja,S,Bernardes,C A,Dogra,S,Fernandez Perez Tomei,T R,Gregores,E M,Mercadante,P G,Moon,C S,Novaes,S F,Padula,Sandra S,Romero Abad,D,Ruiz Vargas,J C,Aleksandrov,A,Hadjiiska,R,Iaydjiev,P,Rodozov,M,Stoykova,S,Sultanov,G,Vutova,M,Dimitrov,A,Glushkov,I,Litov,L,Pavlov,B,Petkov,P,Fang,W,Ahmad,M,Bian,J G,Chen,G M,Chen,H S,Chen,M,Chen,Y,Cheng,T,Jiang,C H,Leggat,D,Liu,Z,Romeo,F,Ruan,M,Shaheen,S M,Spiezia,A,Tao,J,Wang,C,Wang,Z,Zhang,H,Zhao,J,Ban,Y,Chen,G,Li,Q,Liu,S,Mao,Y,Qian,S J,Wang,D,Xu,Z,Avila,C,Cabrera,A,Chaparro Sierra,L F,Florez,C,Gomez,J P,González Hernández,C F,Ruiz Alvarez,J D,Sanabria,J C,Godinovic,N,Lelas,D,Puljak,I,Ribeiro Cipriano,P M,Sculac,T,Antunovic,Z,Kovac,M,Brigljevic,V,Ferencek,D,Kadija,K,Mesic,B,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,Ellithi Kamel,A,Mahmoud,M A,Radi,A,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,Tuominiemi,J,Tuovinen,E,Wendland,L,Talvitie,J,Tuuva,T,Besancon,M,Couderc,F,Dejardin,M,Denegri,D,Fabbro,B,Faure,J L,Favaro,C,Ferri,F,Ganjour,S,Ghosh,S,Givernaud,A,Gras,P,Hamel de Monchenault,G,Jarry,P,Kucher,I,Locci,E,Machet,M,Malcles,J,Rander,J,Rosowsky,A,Titov,M,Abdulsalam,A,Antropov,I,Baffioni,S,Beaudette,F,Busson,P,Cadamuro,L,Chapon,E,Charlot,C,Davignon,O,Granier de Cassagnac,R,Jo,M,Lisniak,S,Miné,P,Nguyen,M,Ochando,C,Ortona,G,Paganini,P,Pigard,P,Regnard,S,Salerno,R,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,Fontaine,J-C,Gelé,D,Goerlach,U,Bihan,A-C Le,Van Hove,P,Gadrat,S,Beauceron,S,Bernet,C,Boudoul,G,Carrillo Montoya,C A,Chierici,R,Contardo,D,Courbon,B,Depasse,P,El 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期刊：European Physical Journal C影响因子：4.800
时间：2017起止号：2017;77(7):459
doi：10.1140/epjc/s10052-017-4984-5

Abstract

Normalized double-differential cross sections for top quark pair ([Formula: see text]) production are measured in pp collisions at a centre-of-mass energy of 8[Formula: see text] with the CMS experiment at the LHC. The analyzed data correspond to an integrated luminosity of 19.7[Formula: see text]. The measurement is performed in the dilepton [Formula: see text] final state. The [Formula: see text] cross section is determined as a function of various pairs of observables characterizing the kinematics of the top quark and [Formula: see text] system. The data are compared to calculations using perturbative quantum chromodynamics at next-to-leading and approximate next-to-next-to-leading orders. They are also compared to predictions of Monte Carlo event generators that complement fixed-order computations with parton showers, hadronization, and multiple-parton interactions. Overall agreement is observed with the predictions, which is improved when the latest global sets of proton parton distribution functions are used. The inclusion of the measured [Formula: see text] cross sections in a fit of parametrized parton distribution functions is shown to have significant impact on the gluon distribution.

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