Forward–backward asymmetry of Drell–Yan lepton pairs in pp collisions at [formula omitted

S Chatrchyan,M Gouzevitch,O Kodolova,A Kayis Topaksu,G Bianchi,F Moortgat,A Taurok,J Slaunwhite,J Erö,M Titov,D Cussans,R Klanner,S My,I Vila,K Mishra,A Bhatti,J Nachtman,S Somalwar,L Forthomme,T.Y Kim,P Paganini,L Brigliadori,E Butz,V Epshteyn,L Gouskos,C Broutin,M Stein,A De Cosa,M Vazquez Acosta,G Bauer,J Santaolalla,T Reis,R Wilken,G Iles,K Klein,S Bitioukov,P Lawson,E Vlasov,J Hegeman,R Doesburg,W Kiesenhofer,X Janssen,D Trocino,C Neu,M Gardner,P Torre,M.S Kim,M Meschini,S Naumann-Emme,D Vishnevskiy,D Domínguez Vázquez,A Lucaroni,A Quintario Olmeda,S Bose,G Walzel,P Lariccia,R Chierici,T Libeiro,S Wasserbaech,A Scheurer,G Codispoti,E Gülmez,J Mnich,S Paktinat Mehdiabadi,O Grachov,G.M Chen,H Kluge,C Urscheler,A Kalinowski,J Merz,L Mundim,A Papageorgiou,D Cline,B Kim,E Casimiro Linares,M De Mattia,A Skuja,L Masetti,D Rathjens,N De Filippis,M Naimuddin,D Stuart,P Lobelle Pardo,S Mueller,M Bergholz,A Kharchilava,S Costantini,R Travaglini,M Pernicka,R Magaña Villalba,A Baden,Y.F Liu,S Kang,A Ostapchuk,M Chamizo Llatas,A Hart,T Speer,M Balazs,P Mcbride,M Voutilainen,T Scarborough,S Sengupta,D Menasce,J Goldstein,K Sudhakar,N Colino,M Janulis,A Mott,F Palmonari,B Dahmes,D Bourilkov,T Ma,D Lange,J.-P Merlo,L Wehrli,S Guragain,R Schöfbeck,E Salvati,F Romeo,S Liang,C Florez,A Markina,T Mäki,J.-M Brom,G Broccolo,H Topakli,S Rappoccio,V Maroussov,D Bodin,R Montalvo,M Haguenauer,M Niegel,S Oliveros,M Vidal Marono,K Freudenreich,R Wallny,B Gomez Moreno,S Dugad,V Blobel,A Hunt,S Lacaprara,J Suarez Gonzalez,L Sarycheva,A Zabi,V Petrov,F Cavallari,A Korpela,N Valls,Y Kubota,J Berger,K Sumorok,M Mooney,J Veverka,J Duris,D Giordano,D Leggat,T Weiler,J Temple,A Luthra,S Gascon,M Giunta,S Goy Lopez,J Hanlon,J Liao,C Mesropian,T Tabarelli De Fatis,H El Mamouni,V Pavlunin,Y Assran,T Bergauer,A Potenza,P Sauerland,H Van Haevermaet,L Perera,F Ptochos,B Tali,L Levchuk,O Charaf,M Yalvac,A Dabrowski,M Pimiä,V Karimäki,D Sunar Cerci,A Belyaev,J Hollar,D Futyan,R Gomez-Reino Garrido,Sh 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Zaganidis,G Merino,P Van Mechelen,G Fedi,T Son,E De La Cruz-Burelo,M Erdmann,C Vander Velde,E Longo,S Khalatyan,G Eckerlin,S Taroni,T Kypreos,I.-A Melzer-Pellmann,J Bendavid,N Pietsch,F Vazquez Valencia,A Leonidov,K Matchev,S König,M Rosin,P Piroué,D Tlisov,T Aliev,L Fanò,S Beauceron,A Bethani,J Mccartin,N Van Remortel,C Boulahouache,J Gronberg,W Lohmann,M Kasemann,K Deiters,E Conte,A Heikkinen,W Funk,K Goulianos,M Dobson,Y Tschudi,E Petrakou,J A Coughlan ,Α Μάρκου ,Huong Thi Thanh Nguyen ,S Troshin,D Krücker,V E Bazterra ,M Correa Martins ,F.-P Schilling,A Gozzelino,A V Gritsan ,V Innocente,S Maruyama,I Dumanoğlu ,S Kunori,Wee Don Teo ,G Zumerle,D Ryckbosch,M E Dinardo ,A Sakharov,S Perriès ,W Adam,N Nishu,G Vesztergombi,A Custódio,P Verwilligen,B P Padley ,A Ghezzi,A Zucchetta,L K Gibbons ,A Sznajder,J Behr,D Colling,I Evangelou,R Hall-Wilton,V Popov,J L Faure ,D H Miller ,I Chakaberia,A Güth,J Salfeld-Nebgen,N Tambe,J Lazo-Flores,V Zhukova,G A Alves ,L Felď ,E Yildirim,A Gaz,P A 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Clare,M Ahmad,G Gökbulut ,Andreas Oehler ,Z Hu,A Kamenev,M Görner,V Sola,K Y Kao ,H Schettler,F Ferri,Z J Guo ,I Mikulec,N Leonardo,M A Reyes-Santos ,C A Carrillo Montoya ,R López-Fernández ,V Reković ,M C Fouz ,Qiao Xu ,S Padhi,C E Gerber ,B Bilin,J Zhang,G Tonelli,R Khurana,B Diamond,Y Gershtein,R Dell’orso ,M Besançon ,U Dosselli,G Selvaggi,S.K Park,W Flanagan,X Huang ,J G Smith ,P E Karchin ,A Poll,J Roe,Y Onel,K Kadija,C Rogan,M Cardaci,A Nürnberg,P Symonds,E Aguiló ,E Barberis,B Parida,L Gauthier,M Zeinali,B Kargoll,U Langenegger,S Beranek,В Жуков ,Y Cho,A Hinzmann,K Burkett,A Brinkerhoff,D Dutta,A Mestvirishvili,J M Marraffino ,K Bloom,M Górski,A O M Iorio ,L Vanelderen,S Sarkar,H C Kaestli ,D D’enterria ,J L Rodriguez ,F Fabozzi,E Kuznetsova,G Brona,V Mossolov,J P Fernández Ramos ,S.W Lee,I V Akin ,C Laganá ,R D Field ,M Stoye,D Velicanu,J Härkönen,K.S Lee,A Khan,G S F Stephans ,P Schleper,M S Soares ,T Dorigo,B Akgün ,D Teyssier,N Amapane,A Beretvas,W J Spalding ,C Dragoiu,M Menichelli,N Tyurin,K Öcalan ,A Safonov,M Galanti,N Adam,U Heintz,V Brigljević ,J S Werner ,Hannsjoerg Artur Weber ,B K Heltsley ,B W Kennedy ,E Sexton-Kennedy,T Peiffer,N Saoulidou,L Perrini,G Daskalakis,G Karapinar,R Rougny,I Ojalvo,J W Gary ,O Doğangün ,S Obraztsov,L N Vergili ,Y Musienko,A Perieanu,S P Shipkowski ,I Katkov,J G Bian ,N Cripps,S Song,L Soffi,Y Mao,W L Aldá Júnior ,A Petrilli,R E Hughes ,K Petridis,I Fisk,J Flix,P Musella,F Beaudette,J A Gomez ,D Bonacorsi,Peter R Hobson ,D Ćutts ,F Giordano,K F Johnson ,B Wysłouch ,L M Lebolo ,L Lista,S Argirò ,D Kotliński ,S Wang,T Kamon,T Rodrigo,S A Koay ,S Panwalkar,K Theofilatos,K Romanowska-Rybinska,C Dozen,D A Sanders ,J Rohlf,M Klute,N Wardle,K H Hoffmann ,F Würthwein,Mustafa Numan Bakirci ,G P Van Onsem ,K Piotrzkowski,J Zabel,J Sánchez ,B Ille,J Leonard,J Duarte,G M Bilei ,B Wittmer,W Sun,H R Hoorani ,E Dietz-Laursonn,A.-M Magnan,Humberto Antonio Salazar Ibarguen ,A Kraan,B Dorney,B Bilki,D R Claes ,Guillelmo Gomez Ceballos ,T Rovelli,C Tully,A Kalogeropoulos,D C Son ,B Roland,P Shukla,N Skhirtladze,W Lin,A Kyriakis,B Ujvári ,K S Grogg ,M Wayne,Benjamin Charles Radburn-Smith ,M A Buchmann ,A F Barfuss ,W T Ford ,J P Cumalat ,M Felcini,A Özpineci ,S Bilmiş ,A Rácz ,E M Gregores ,Thomas Hermanns ,N Pastrone,S Malik,I K Furic ,G Auzinger,D Favart,M Raidal,M B Tonjes ,K A Ulmer ,A Dominguez,P Hebda,M J Costa ,D Carlsmith,H Liu,F J Ronga ,C Dietz,V Golovtsov,P Lamichhane,S Gowdy,D Strom,N Cavallo,E A Albayrak ,M Wang,N Shumeiko,M W Arenton ,R Harr,S C Tonwar ,H F Heath ,P M Ribeiro Cipriano ,V M Ghete ,Jordon Rowe Adams ,J A Brochero Cifuentes ,K Yi,C Ochando,S R Wagner ,A S Yoon ,A Stahl,Chia‐Ming Kuo ,N Pastika,A Pfeiffer,L Muñiz ,J M Hernández ,F Ligabue,N Redaelli,I D Reid ,L Uplegger,G Abbiendi,O Gutsche,E Eşkut ,Р Тенчини ,N Odell,C Rovelli,F Palla,W H Smith ,A Nayak,L Taylor,S G Heo ,S C Eno ,G P Siroli ,S Braibant-Giacomelli,S Bansal,A Popov,C Paus,K.H Chen,P Harris,R Y Zhu ,Н Голубев ,M R Adams ,A T 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Cortezón ,I Golutvin,Steven Worm ,R Arcidiacono,A Bhardwaj,N Krasnikov,S Lynch,C Willmott,H Weber,K Krajczár ,N Cartiglia,M Peruzzi,B Bylsma,K Ranjan,O Kaya,S Chauhan,C Schwick,A Lanaro,S R Ro ,G Organtini,F Pauß ,R A Manzoni ,M Chadwick,M Sigamani,A C Benvenuti ,Y Chào ,R Sacchi,J Królikowski ,V Sordini,D Berry,P Dauncey

doi:10.1016/j.physletb.2012.10.082

Abstract

A measurement of the forward–backward asymmetry (AFB) of Drell–Yan lepton pairs in pp collisions at s=7 TeV is presented. The data sample, collected with the CMS detector, corresponds to an integrated luminosity of 5 fb−1. The asymmetry is measured as a function of dilepton mass and rapidity in the dielectron and dimuon channels. Combined results from the two channels are presented, and are compared with the standard model predictions. The AFB measurement in the dimuon channel and the combination of the two channels are the first such results obtained at a hadron collider. The measured asymmetries are consistent with the standard model predictions.

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