Measurement of associated Z + charm production in proton-proton collisions at [Formula: see text] TeV

在 [公式：见正文] TeV 的质子-质子碰撞中测量伴随 Z + 粲 产生。

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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,Hörmann,N,Hrubec,J,Jeitler,M,König,A,Krätschmer,I,Liko,D,Madlener,T,Matsushita,T,Mikulec,I,Pree,E,Rabady,D,Rad,N,Rohringer,H,Schieck,J,Spanring,M,Spitzbart,D,Strauss,J,Waltenberger,W,Wittmann,J,Wulz,C-E,Zarucki,M,Chekhovsky,V,Mossolov,V,Gonzalez,J Suarez,Shumeiko,N,De Wolf,E A,Janssen,X,Lauwers,J,Van De Klundert,M,Van Haevermaet,H,Van Mechelen,P,Van Remortel,N,Van Spilbeeck,A,Zeid,S Abu,Blekman,F,D'Hondt,J,De Bruyn,I,De Clercq,J,Deroover,K,Flouris,G,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,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,Salva,S,Schöfbeck,R,Tytgat,M,Van Driessche,W,Verbeke,W,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,Marono,M Vidal,Wertz,S,Beliy,N,Júnior,W L Aldá,Alves,F L,Alves,G A,Brito,L,Hensel,C,Moraes,A,Pol,M E,Teles,P Rebello,Chagas,E Belchior Batista Das,Carvalho,W,Chinellato,J,Custódio,A,Costa,E M Da,Silveira,G G Da,Damiao,D De Jesus,De Souza,S Fonseca,Guativa,L M Huertas,Malbouisson,H,Herrera,C Mora,Mundim,L,Nogima,H,Santoro,A,Sznajder,A,Manganote,E J Tonelli,Araujo,F Torres Da Silva De,Pereira,A Vilela,Ahuja,S,Bernardes,C A,Tomei,T R Fernandez Perez,Gregores,E M,Mercadante,P G,Moon,C S,Novaes,S F,Padula,Sandra S,Abad,D Romero,Vargas,J C Ruiz,Aleksandrov,A,Hadjiiska,R,Iaydjiev,P,Misheva,M,Rodozov,M,Stoykova,S,Sultanov,G,Vutova,M,Dimitrov,A,Glushkov,I,Litov,L,Pavlov,B,Petkov,P,Fang,W,Gao,X,Ahmad,M,Bian,J G,Chen,G M,Chen,H S,Chen,M,Chen,Y,Jiang,C H,Leggat,D,Liu,Z,Romeo,F,Shaheen,S M,Spiezia,A,Tao,J,Wang,C,Wang,Z,Yazgan,E,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,Sierra,L F Chaparro,Florez,C,Hernández,C F González,Alvarez,J D Ruiz,Godinovic,N,Lelas,D,Puljak,I,Cipriano,P M Ribeiro,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,Jarrin,E Carrera,El-Khateeb,E,Elgammal,S,Ellithi Kamel,A,Dewanjee,R 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,Rander,J,Rosowsky,A,Sahin,M Ö,Titov,M,Abdulsalam,A,Antropov,I,Baffioni,S,Beaudette,F,Busson,P,Cadamuro,L,Chapon,E,Charlot,C,Davignon,O,de Cassagnac,R Granier,Jo,M,Lisniak,S,Lobanov,A,Nguyen,M,Ochando,C,Ortona,G,Paganini,P,Pigard,P,Regnard,S,Salerno,R,Sirois,Y,StahlLeiton,A G,Strebler,T,Yilmaz,Y,Zabi,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,Chierici,R,Contardo,D,Courbon,B,Depasse,P,Mamouni,H El,Fay,J,Finco,L,Gascon,S,Gouzevitch,M,Grenier,G,Ille,B,Lagarde,F,Laktineh,I B,Lethuillier,M,Mirabito,L,Pequegnot,A L,Perries,S,Popov,A,Sordini,V,Donckt,M Vander,Viret,S,Khvedelidze,A,Tsamalaidze,Z,Autermann,C,Beranek,S,Feld,L,Kiesel,M K,Klein,K,Lipinski,M,Preuten,M,Schomakers,C,Schulz,J,Verlage,T,Albert,A,Brodski,M,Dietz-Laursonn,E,Duchardt,D,Endres,M,Erdmann,M,Erdweg,S,Esch,T,Fischer,R,Güth,A,Hamer,M,Hebbeker,T,Heidemann,C,Hoepfner,K,Knutzen,S,Merschmeyer,M,Meyer,A,Millet,P,Mukherjee,S,Olschewski,M,Padeken,K,Pook,T,Radziej,M,Reithler,H,Rieger,M,Scheuch,F,Sonnenschein,L,Teyssier,D,Thüer,S,Flügge,G,Kargoll,B,Kress,T,Künsken,A,Lingemann,J,Müller,T,Nehrkorn,A,Nowack,A,Pistone,C,Pooth,O,Stahl,A,Martin,M Aldaya,Arndt,T,Asawatangtrakuldee,C,Beernaert,K,Behnke,O,Behrens,U,Anuar,A A Bin,Borras,K,Botta,V,Campbell,A,Connor,P,Contreras-Campana,C,Costanza,F,Pardos,C Diez,Eckerlin,G,Eckstein,D,Eichhorn,T,Eren,E,Gallo,E,Garcia,J Garay,Geiser,A,Gizhko,A,Luyando,J M Grados,Grohsjean,A,Gunnellini,P,Harb,A,Hauk,J,Hempel,M,Jung,H,Kalogeropoulos,A,Kasemann,M,Keaveney,J,Kleinwort,C,Korol,I,Krücker,D,Lange,W,Lelek,A,Lenz,T,Leonard,J,Lipka,K,Lohmann,W,Mankel,R,Melzer-Pellmann,I-A,Meyer,A B,Mittag,G,Mnich,J,Mussgiller,A,Ntomari,E,Pitzl,D,Placakyte,R,Raspereza,A,Roland,B,Savitskyi,M,Saxena,P,Shevchenko,R,Spannagel,S,Stefaniuk,N,Van Onsem,G P,Walsh,R,Wen,Y,Wichmann,K,Wissing,C,Bein,S,Blobel,V,Vignali,M Centis,Draeger,A R,Dreyer,T,Garutti,E,Gonzalez,D,Haller,J,Hoffmann,M,Junkes,A,Klanner,R,Kogler,R,Kovalchuk,N,Kurz,S,Lapsien,T,Marchesini,I,Marconi,D,Meyer,M,Niedziela,M,Nowatschin,D,Pantaleo,F,Peiffer,T,Perieanu,A,Scharf,C,Schleper,P,Schmidt,A,Schumann,S,Schwandt,J,Sonneveld,J,Stadie,H,Steinbrück,G,Stober,F M,Stöver,M,Tholen,H,Troendle,D,Usai,E,Vanelderen,L,Vanhoefer,A,Vormwald,B,Akbiyik,M,Barth,C,Baur,S,Baus,C,Berger,J,Butz,E,Caspart,R,Chwalek,T,Colombo,F,De Boer,W,Dierlamm,A,Freund,B,Friese,R,Giffels,M,Gilbert,A,Haitz,D,Hartmann,F,Heindl,S 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Palma,M,Fiore,L,Iaselli,G,Maggi,G,Maggi,M,Miniello,G,My,S,Nuzzo,S,Pompili,A,Pugliese,G,Radogna,R,Ranieri,A,Selvaggi,G,Sharma,A,Silvestris,L,Venditti,R,Verwilligen,P,Abbiendi,G,Battilana,C,Bonacorsi,D,Braibant-Giacomelli,S,Brigliadori,L,Campanini,R,Capiluppi,P,Castro,A,Cavallo,F R,Chhibra,S S,Cuffiani,M,Dallavalle,G M,Fabbri,F,Fanfani,A,Fasanella,D,Giacomelli,P,Guiducci,L,Marcellini,S,Masetti,G,Navarria,F L,Perrotta,A,Rossi,A M,Rovelli,T,Siroli,G P,Tosi,N,Albergo,S,Costa,S,Di Mattia,A,Giordano,F,Potenza,R,Tricomi,A,Tuve,C,Barbagli,G,Chatterjee,K,Ciulli,V,Civinini,C,D'Alessandro,R,Focardi,E,Lenzi,P,Meschini,M,Paoletti,S,Russo,L,Sguazzoni,G,Strom,D,Viliani,L,Benussi,L,Bianco,S,Fabbri,F,Piccolo,D,Primavera,F,Calvelli,V,Ferro,F,Robutti,E,Tosi,S,Brianza,L,Brivio,F,Ciriolo,V,Dinardo,M E,Fiorendi,S,Gennai,S,Ghezzi,A,Govoni,P,Malberti,M,Malvezzi,S,Manzoni,R A,Menasce,D,Moroni,L,Paganoni,M,Pauwels,K,Pedrini,D,Pigazzini,S,Ragazzi,S,de Fatis,T Tabarelli,Buontempo,S,Cavallo,N,Di Guida,S,Fabozzi,F,Fienga,F,Iorio,A O M,Khan,W A,Lista,L,Meola,S,Paolucci,P,Sciacca,C,Thyssen,F,Azzi,P,Bacchetta,N,Bellato,M,Benato,L,Benettoni,M,Biasotto,M,Bisello,D,Boletti,A,Oliveira,A Carvalho Antunes De,Checchia,P,Dall'Osso,M,Manzano,P De Castro,Dorigo,T,Dosselli,U,Gasparini,F,Gozzelino,A,Lacaprara,S,Margoni,M,Meneguzzo,A T,Pozzobon,N,Ronchese,P,Rossin,R,Torassa,E,Zanetti,M,Zotto,P,Zumerle,G,Braghieri,A,Fallavollita,F,Magnani,A,Montagna,P,Ratti,S P,Re,V,Ressegotti,M,Riccardi,C,Salvini,P,Vai,I,Vitulo,P,Solestizi,L Alunni,Bilei,G M,Ciangottini,D,Fanò,L,Lariccia,P,Leonardi,R,Mantovani,G,Mariani,V,Menichelli,M,Saha,A,Santocchia,A,Spiga,D,Androsov,K,Azzurri,P,Bagliesi,G,Bernardini,J,Boccali,T,Borrello,L,Castaldi,R,Ciocci,M A,Dell'Orso,R,Fedi,G,Giassi,A,Grippo,M T,Ligabue,F,Lomtadze,T,Martini,L,Messineo,A,Palla,F,Rizzi,A,Savoy-Navarro,A,Spagnolo,P,Tenchini,R,Tonelli,G,Venturi,A,Verdini,P G,Barone,L,Cavallari,F,Cipriani,M,Daci,N,Del Re,D,Diemoz,M,Gelli,S,Longo,E,Margaroli,F,Marzocchi,B,Meridiani,P,Organtini,G,Paramatti,R,Preiato,F,Rahatlou,S,Rovelli,C,Santanastasio,F,Amapane,N,Arcidiacono,R,Argiro,S,Arneodo,M,Bartosik,N,Bellan,R,Biino,C,Cartiglia,N,Cenna,F,Costa,M,Covarelli,R,Degano,A,Demaria,N,Kiani,B,Mariotti,C,Maselli,S,Migliore,E,Monaco,V,Monteil,E,Monteno,M,Obertino,M M,Pacher,L,Pastrone,N,Pelliccioni,M,Angioni,G L Pinna,Ravera,F,Romero,A,Ruspa,M,Sacchi,R,Shchelina,K,Sola,V,Solano,A,Staiano,A,Traczyk,P,Belforte,S,Casarsa,M,Cossutti,F,Della Ricca,G,Zanetti,A,Kim,D H,Kim,G N,Kim,M S,Lee,J,Lee,S,Lee,S W,Oh,Y D,Sekmen,S,Son,D C,Yang,Y C,Lee,A,Kim,H,Moon,D H,Cifuentes,J A Brochero,Goh,J,Kim,T J,Cho,S,Choi,S,Go,Y,Gyun,D,Ha,S,Hong,B,Jo,Y,Kim,Y,Lee,K,Lee,K S,Lee,S,Lim,J,Park,S K,Roh,Y,Almond,J,Kim,J,Lee,H,Oh,S B,Radburn-Smith,B C,Seo,S H,Yang,U K,Yoo,H D,Yu,G B,Choi,M,Kim,H,Kim,J H,Lee,J S H,Park,I C,Ryu,G,Choi,Y,Hwang,C,Lee,J,Yu,I,Dudenas,V,Juodagalvis,A,Vaitkus,J,Ahmed,I,Ibrahim,Z A,Ali,M A B Md,Idris,F Mohamad,Abdullah,W A T Wan,Yusli,M N,Zolkapli,Z,Castilla-Valdez,H,Cruz-Burelo,E De La,Cruz,I Heredia-De La,Lopez-Fernandez,R,Guisao,J Mejia,Sanchez-Hernandez,A,Moreno,S Carrillo,Barrera,C Oropeza,Valencia,F Vazquez,Pedraza,I,Ibarguen,H A Salazar,Estrada,C Uribe,Pineda,A Morelos,Krofcheck,D,Butler,P H,Ahmad,A,Ahmad,M,Hassan,Q,Hoorani,H R,Saddique,A,Shah,M A,Shoaib,M,Waqas,M,Bialkowska,H,Bluj,M,Boimska,B,Frueboes,T,Górski,M,Kazana,M,Nawrocki,K,Romanowska-Rybinska,K,Szleper,M,Zalewski,P,Bunkowski,K,Byszuk,A,Doroba,K,Kalinowski,A,Konecki,M,Krolikowski,J,Misiura,M,Olszewski,M,Pyskir,A,Walczak,M,Bargassa,P,Silva,C Beirão Da Cruz E,Calpas,B,Di Francesco,A,Faccioli,P,Gallinaro,M,Hollar,J,Leonardo,N,Iglesias,L Lloret,Nemallapudi,M V,Seixas,J,Toldaiev,O,Vadruccio,D,Varela,J,Baginyan,A,Golunov,A,Golutvin,I,Karjavin,V,Korenkov,V,Kozlov,G,Lanev,A,Malakhov,A,Matveev,V,Mitsyn,V V,Palichik,V,Perelygin,V,Shmatov,S,Skatchkov,N,Smirnov,V,Yuldashev,B 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期刊：European Physical Journal C影响因子：4.800
时间：2018起止号：2018;78(4):287
doi：10.1140/epjc/s10052-018-5752-x

Abstract

A study of the associated production of a Z boson and a charm quark jet ( Z + c ), and a comparison to production with a b quark jet ( Z + b ), in pp collisions at a centre-of-mass energy of 8 TeV are presented. The analysis uses a data sample corresponding to an integrated luminosity of 19.7 fb-1 , collected with the CMS detector at the CERN LHC. The Z boson candidates are identified through their decays into pairs of electrons or muons. Jets originating from heavy flavour quarks are identified using semileptonic decays of c or b flavoured hadrons and hadronic decays of charm hadrons. The measurements are performed in the kinematic region with two leptons with pTℓ > 20 GeV , |ηℓ| < 2.1 , 71 < mℓℓ < 111 GeV , and heavy flavour jets with pTjet > 25 GeV and |ηjet| < 2.5 . The Z + c production cross section is measured to be σ(pp → Z + c + X)B(Z → ℓ+ℓ-) = 8.8 ± 0.5 (stat) ± 0.6 (syst) pb . The ratio of the Z + c and Z + b production cross sections is measured to be σ(pp → Z + c + X)/σ(pp → Z + b + X) = 2.0 ± 0.2 (stat) ± 0.2 (syst) . The Z + c production cross section and the cross section ratio are also measured as a function of the transverse momentum of the Z boson and of the heavy flavour jet. The measurements are compared with theoretical predictions.

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