Measurement of jet activity produced in top-quark events with an electron, a muon and two b-tagged jets in the final state in pp collisions at sqrt{s}=13 TeV with the ATLAS detector

M Aaboud,V Croft,B P Kerševan,A Kourkoumeli-Charalampidi,C A Lee,O S Abouzeid,J Olszowska,S Berlendis,B Weinert,D Álvarez Piqueras,L Asquith,B Lenzi,L I Mcclymont,N Valencic,C Alpigiani,L Morvaj,D Lynn,K Einsweiler,P Rados,S Oda,F C Ungaro,A Bethani,T Kubota,E Ertel,B M Barnett,M Ishino,S Calvente Lopez,C Wang,K Karthik,K Suruliz,S Schier,W K Brooks,A Trzupek,Z Barnovska-Blenessy,S Roe,M Kado,D Bertsche,A Favareto,A Lehan,A Petridis,A Annovi,I Nomidis,L Helary,S J Mcmahon,C Sawyer,C Farina,K Yoshihara,E Higón-Rodriguez,C R Kilby,N Flaschel,U Bratzler,L Adamczyk,P Wagner,A Amorim,S Kido,W Lukas,T Buanes,N.-A Rosien,C Antel,H Iwasaki,V O Tikhomirov,L J Levinson,S Falciano,I M Trigger,C G Lester,M W Krasny,M Lassnig,G Maccarrone,C Leroy,R Staszewski,V Radescu,Y Heng,A Sood,H S Hayward,G Crosetti,A Sansoni,D V Perepelitsa,A M Litke,X Ruan,S Elles,Y Kataoka,A Kotwal,M Arratia,P Moschovakos,S Mehlhase,J Sánchez,M Bajic,U Landgraf,W Buttinger,A M Soukharev,J Jongmanns,J S Ennis,D Varouchas,P P Allport,J J Kempster,P Grafström,K Shaw,S Chouridou,G Bella,X Chen,M Muškinja,K Kleinknecht,D Britzger,X Lou,D Rousseau,G Aad,S Lammers,L Fabbri,S Moritz,O Stelzer-Chilton,C Gwenlan,S Camarda,C Nellist,K Rosbach,D Yamaguchi,W J Dearnaley,P Butti,M Capua,L Carminati,J Barreiro Guimarães Da Costa,F Lacava,J M Butler,R J Falla,A Paramonov,V Radeka,S Wahrmund,I Korolkov,T J Khoo,C Heinz,J E Black,D Denysiuk,R Vari,O Sasaki,S Demers,J Thomas-Wilsker,M F Watson,R Spighi,K Todome,E Shulga,V Scarfone,S Gadatsch,K Lantzsch,P Tas,K Dette,R Mantifel,G Qin,D Lacour,A Rimoldi,D Pluth,J U Mjörnmark,R Hauser,Y Enari,P Schacht,T Kharlamova,K Reeves,E G Tskhadadze,W B Quayle,V Khovanskiy,K Vorobev,M G Kurth,K Köneke,F Ould-Saada,S Chen,T Colombo,I Naryshkin,C Blocker,A Cortes-Gonzalez,M Simon,I Ibragimov,E Karentzos,L Meng,D Schaefer,D Price,J Jia,J Dingfelder,M Ghneimat,K Bendtz,F Rühr,B M Wynne,S Amoroso,M Zhou,L S Bruni,A Khanov,J Ferrando,H Otono,N R Bernard,P Iengo,S Kortner,H Bilokon,C Ciocca,M Mikuž,I Nikolic-Audit,L Fiorini,T Z Kowalski,M Frate,P Hamal,M V Chizhov,N Anjos,J Jovicevic,S Blunier,J Fuster,S Kuday,T A Martin,T Klioutchnikova,X Ju,L Colasurdo,M Giulini,S M Mazza,V A Schegelsky,T Koi,A Washbrook,K Brendlinger,H Herde,N F Castro,H Sakamoto,A Demilly,P Mättig,J Zhu,J M Seixas,P R Newman,A Sfyrla,T G Mccarthy,C Rangel-Smith,A A Grillo,B Abeloos,N Huseynov,P Sherwood,M J White,G Jarlskog,M Cobal,G Palacino,Z Zinonos,A A Komar,G Sekhniaidze,F A Arduh,D Duschinger,C Eckardt,N Schuh,P Tipton,J Kvita,Y Okumura,A Vaniachine,C C Chau,A J Horton,D Turgeman,N M Köhler,P Savard,A Milic,A Valero,B Trocmé,E Mountricha,S Li,F Winklmeier,M F Tripiana,T Varol,J Schaarschmidt,S Adomeit,H Chen,A Kaluza,V Tsiskaridze,R Seuster,D Iliadis,P Kluit,G Lerner,S Sacerdoti,O L Rezanova,H Kroha,J A Wilson,J Bouffard,H Jiang,H Oberlack,K M Tsui,K Kroeninger,G Mancini,D Madaffari,E Simioni,K Kordas,F Prokoshin,P A Janus,B A Schumm,P Krieger,E Torró Pastor,S Jiggins,R Turra,J Rieger,M Vos,P Ferrari,T Adye,A C König,C Meyer,S Shimizu,C Li,M Rotaru,V Cavasinni,U Kruchonak,M Lazzaroni,D Kyriazopoulos,V Kouskoura,J R Batley,A Milov,Y Takubo,R Vuillermet,T Harenberg,N Zhou,G Facini,H Zhang,J E Derkaoui,G T Forcolin,A Brandt,A Kugel,S Schramm,M C Vetterli,L Pontecorvo,S Pataraia,J Mahlstedt,O Benary,A Nelson,Z Jiang,L Paolozzi,C Diaconu,M W Wolter,E Kladiva,A Warburton,X Zhang,M A Parker,P Urquijo,J Knapik,O Kuprash,S Rosati,P T E Taylor,A Vest,J Nielsen,J Janssen,F Ceradini,C E Pandini,L Živković,T Kunigo,S Richter,A Hoummada,B Axen,R Nisius,S P Swift,C C Ohm,S M Farrington,M Levchenko,J E García Navarro,A Knue,J H Vossebeld,Y Cheng,F Siegert,G Costa,T Ženiš,G Ernis,G G Hesketh,F Cirotto,D Lewis,H Kucuk,C Bini,S Caron,V Izzo,S Veneziano,S Williams,E M Farina,S Kersten,C Gumpert,H Kolanoski,U Klein,M Saimpert,J T Shank,T Dai,A Negri,O Arnaez,A Hoecker,O C Endner,D Zerwas,D A Maximov,I R Boyko,A R Stradling,M Slater,S Shojaii,M A Pickering,S Shrestha,H L Russell,Y Hasegawa,U Blumenschein,A G Goussiou,M Huhtinen,J Yu,D Barberis,S Muanza,L Lee,G Navarro,R Soualah,Z Rurikova,M Shapiro,G A Mullier,R Sadykov,P Tornambe,J Haley,W Liebig,E Vilucchi,K Iordanidou,M Testa,S Ye,N Savic,C M Buttar,K Assamagan,H Krüger,Y Tayalati,P Klimek,H Son,F Cerutti,S Gentile,T P Calvet,S A Weber,H Ma,G Alimonti,L Barak,K Prokofiev,F Ito,N Orlando,T R Wyatt,S Mergelmeyer,S Raddum,B Brau,S H Connell,V Chiarella,M Nomachi,D R Tovey,Y Chen,R Cardarelli,L Perini,L Graber,K Liu,E Ladygin,S Bentvelsen,E Brost,R Poettgen,H Sandaker,P V Tsiareshka,R Debbe,A T Law,C Y Shehu,L Shi,A G Kharlamov,J Veatch,M S Neubauer,A Poley,M Wielers,J Searcy,G Azuelos,M Bedognetti,M Neumann,J Lacey,B Mindur,A Gabrielli,E Nurse,W Walkowiak,D Kisielewska,G C Grossi,S N Karpov,S Schaepe,V Bortolotto,M P J Landon,M Aliev,M Spalla,C Alexa,A Kaczmarska,R Sobie,M Suk,T Kwan,B Li,M Shiyakova,L Bryngemark,P W Phillips,F Huegging,T Nakamura,S Jézéquel,E Gramstad,M Schernau,K Becker,P Steinberg,L Zwalinski,J L Pinfold,A Koulouris,A Tavares Delgado,L Cerrito,A S Mete,L Vacavant,F Wang,Y Zhao,R Rezvani,J Salt,J M Izen,Y Ma,B B Tannenwald,R M Neves,A K Duncan,J H Broughton,S Rajagopalan,F Kuger,L E Pedersen,S W Weber,A Sbrizzi,N Govender,H A Gordon,L Guan,M Strauss,T Iizawa,S Constantinescu,M Owen,R A Keyes,C Petridou,C Mills,T Kishimoto,C Anastopoulos,R Zhang,B K Gjelsten,K Grevtsov,P J Lösel,P M Jorge,M G Ratti,V Christodoulou,B Galhardo,J Ernst,I Gorelov,I Gkialas,M Backhaus,A Mann,E Gross,U Parzefall,K Augsten,M Klein,O Smirnova,J Abdallah,P Radloff,P Bechtle,J Stark,J Dopke,B Gorini,Q Li,A Maevskiy,M Iodice,C Bock,M J Flowerdew,S J Haywood,K D Finelli,M Kobel,V B Vinogradov,S Laplace,D Bortoletto,M Moreno Llácer,C Meroni,A Redelbach,S Simion,I Koletsou,E J Feng,G Herten,S Ghasemi,Y Abulaiti,Y Coadou,R Voss,W A Leight,M Filipuzzi,J Godlewski,R Walker,P Teixeira-Dias,J Kroseberg,J Kroll,V Smakhtin,M T Dova,S Grinstein,Y Nagasaka,O Bessidskaia Bylund,G Marceca,S Suchek,I Roth,A Olszewski,S Guindon,R Schaefer,Z Zhang,A Kastanas,C Schillo,I Wingerter-Seez,C Rembser,D Liu,J G Vasquez,R Iuppa,Y L Liu,S Wenig,T Andeen,O Igonkina,J K Behr,K Kawagoe,L Gauthier,B T King,V Nikolaenko,J Fischer,M Rimoldi,T Alexopoulos,R S P Mueller,E Busato,Y Rozen,E Rossi,M C Stockton,G A Vasquez,L Li,B Malaescu,C Valderanis,F Rizatdinova,M Schumacher,B M Schachtner,D Berge,P Giannetti,J J Chwastowski,H Y Song,C Glasman,A Lucotte,D Biedermann,K Pommès,G Gaycken,C Peng,M Bosman,L P Rossi,M Sessa,C Troncon,A Chatterjee,D E Marley,D Freeborn,B Liberti,L J Beemster,N Hod,E Ros,M Aoki,S Suzuki,A S Cerqueira,L Gonella,T P A Åkesson,F Hartjes,M Casolino,M J Baca,E W Varnes,B Åsman,P Hanke,M Antonelli,S Cheatham,K Korcyl,M Ouchrif,I Deigaard,V P Maleev,I A Minashvili,J Bortfeldt,P Saha,T Farooque,R Stamen,S Miglioranzi,A I Mincer,M Nordberg,A Schwartzman,G Alexander,G A Popeneciu,A Clark,A Pingel,A White,D Büscher,R Nayyar,F Legger,N V Biesuz,R Hertenberger,K Hamacher,S Stonjek,W Taylor,P Nilsson,D O Jamin,M Swiatlowski,G Aielli,Z Zhao,G Iacobucci,M Scarcella,R Gupta,E Hill,S P Marsden,A Aloisio,H Ogren,A Venturini,C W Black,R W Gardner,Y Makida,Ch Geich-Gimbel,M Tanaka,C Kozakai,Y Yang,L Kashif,J Dassoulas,S Mohapatra,R D Harrington,A Macchiolo,S S Bocchetta,T Wengler,J D Mansour,L Mapelli,G Gilles,S Stärz,F Alonso,G H Stark,A J Beddall,J Dietrich,L Schaefer,Y Minami,W Verkerke,D Boumediene,K Bachas,K Jakobs,L Hauswald,D Duda,S Angelidakis,M Fanti,T Berry,A E Kiryunin,A Hrynevich,T Trefzger,A Undrus,S Tsiskaridze,R Nicolaidou,U Soldevila,D Tsybychev,R Tafirout,O Novgorodova,E W Hughes,V Jain,M J Kareem,N Makovec,H J Stelzer,G Galster,E Meoni,M M Stanitzki,M J Schultens,R D Mudd,F Scuri,M Bruschi,C Leonidopoulos,T Balestri,O Kepka,M Becker,A Rodriguez Perez,H K Hadavand,B E Cox,P Stolte,F Touchard,P Bagnaia,P Mermod,J Katzy,P Huo,S Valentinetti,E V Korolkova,M Fincke-Keeler,L Longo,Q Zeng,Z M Karpova,N Venturi,N Tsirintanis,K R Schmidt-Sommerfeld,O Røhne,M Zinser,L Sawyer,A M 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Sidorov,M A Chelstowska,C J S Young,D Lellouch,S Zambito,P Mastrandrea,M Vlasak,A Cheplakov,C Kourkoumelis,D Derendarz,J Guo,J Love,G Sokhrannyi,L Rehnisch,C Zimmermann,O Gueta,M Bindi,W Lavrijsen,V Pozdnyakov,R Reece,S Kuleshov,C Luci,J Wakabayashi,C David,E Rizvi,K Tokushuku,V Vacek,D A Scannicchio,M A Shupe,G Halladjian,P Hodgson,F Filthaut,S Hellman,I Vichou,F Hoenig,R Jansky,C Malone,C Sandoval,J Mamuzic,C A Johnson,F Barreiro,J Poveda,S Pedraza Lopez,L Tompkins,A J Armbruster,T Heck,J Carvalho,T Hryn’Ova,N Besson,J Gramling,D Cinca,H Schulz,F Fabbri,A Ferrari,G Redlinger,A Zhemchugov,Y Ninomiya,N P Hessey,H Fox,T Barillari,K Yorita,F Ellinghaus,T Wang,L G Gagnon,D South,N Kondrashova,G Callea,E L Gkougkousis,R C Edgar,A V Anisenkov,M C Kruse,I Carli,E S Kuwertz,J P Rutherfoord,S Cabrera Urbán,B Meirose,F Rubbo,G Mchedlidze,M Ronzani,S S Mortensen,A C Schaffer,S Rave,J Hejbal,L Xu,J T Kuechler,T C Petersen,T A Beermann,E Ritsch,M Boonekamp,F Hubaut,A Dimitrievska,L Heinrich,S J 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Elsing,A G Bogdanchikov,J Ye,G Piacquadio,C Rizzi,G Watts,K Nagai,O Gabizon,L Beresford,J Zhang,P O J Gradin,Y Liu,I Caprini,J R Dandoy,S Molander,G Brandt,V D Peshekhonov,B Lefebvre,Y Oren,M Villa,A A Solodkov,M Stoebe,H Severini,F Bertolucci,D Fournier,T J Jones,T Carli,E Monnier,A Cueto,T T Tulbure,C Helsens,V A Kramarenko,F Wilk,D Giugni,G Mornacchi,R Pedro,H Wahlberg,S Honda,F O’Grady,M Raymond,M Solar,H S Bawa,G Zhang,R Brenner,R Klingenberg,F Nuti,V J Martin,E Pianori,T Sýkora ,J Proudfoot,F Muêller ,A I Etienvre,J A Bogaerts,Y Yasu,P Calafiura,Y Jiang,N Rompotis,M S Rudolph,E Etzion,V Šimák ,P Stríženec ,C Roda,J C Vermeulen,P Sinervo,T Pauly,B Schneider,I Sýkora ,R Caminal Armadans,S J Hillier,I Grabowska-Bołd ,K Hanagaki,V Boisvert,A A Nepomuceno,L K Gladilin,M King,J Keller ,Y Kulchitsky,M Hasegawa,N A Styles,R Peschke,Y Fang,S Che,S De Cecco,J B Hansen,J A Valls Ferrer,J T Baines,B K B Chow,M C Mondragon,R Abreu,G Kawamura,K P Mistry,F De Lorenzi,A Camplani,D I Narrias 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Ellis,D Quilty,И И Цукерман ,M Curatolo,B D Schoenrock,M Nagel,A Chafaq,Yu A Tikhonov,W Guan,M K Köhler,Zhou Liu ,F Cardillo,R Gonçalo,P A Gorbounov,D Kobayashi,S Goldfarb,M P Casado,T Slavíček ,V Herget,D Casper ,Y Wu,I M Snyder,G Borissov,T Blažek ,M Pedersen,M Przybycień ,J E Brau,Pa Malecki,M Cano Bret,Y F Ryabov,L M Veloce,T Guillemin,A Kobayashi,J F P Schouwenberg,M Beretta,I Ochoa,A Lipniacka,T Kühl ,N Andari,E Dawe,H Oide,K Gellerstedt,M Villaplana Pérez ,J A Parsons,S Feigl,N L Whallon,A Cervelli,M Lefebvre,Arturos Sanchez Pineda ,W F Mader,P Jackson,L Massa,B Cole,J D Bossio Sola,D Amidei,W-M Yao ,N L Abraham,D Ziemińska ,D J A Antrim ,S Farrell,S C Lin,D Krasnopevtsev,A Lopez Solis,F Seifert,Y Sugaya,M Zhang,D R Wardrope,E Fullana Torregrosa,P E Sidebo,E E Kluge ,C Padilla Aranda,D Yu ,S Kuehn,P Némethy ,O Jinnouchi,A Hadef,J J Heinrich,M Kretz,A N Karyukhin,M M Perego,S Vlachos,A Forti,M Hrabovský ,K Hanawa,C Zhou,W Blum,A Boveia,M Vreeswijk,A Zemla,A N Tuna,A Bellerive,Z Yan,F A Teischinger,M D M Capeans Garrido,A Maio,M Mikeštíková ,C Debenedetti,M Bianco,K Desch,T H Lin,A Madsen,M Lisovyi,D Zanzi,N M Hartmann,L Rinaldi,P Balek,S Youssef,F G Oakham,M R Clark,R E Ticse Torres,E Tassi,K Hamano,C Chen,Ph Gris,M Volpi,D Zhang,A Gorišek,A Lounis,P K Teng,K De,K Bos,G Stoicea,A Peyaud,E A Starchenko,D V Dedovich,W Wagner,J Maeda,S B Menary,T Kono,S Asai,Y Amaral Coutinho,L Luminari,M Kuze,E Yatsenko,C Gütschow ,M J Woudstra,T Fusayasu,C Gemme,P Gallus,S Resconi,D Puddu,M Pitt,V Sanchez Martinez,A Robichaud-Véronneau ,G Darbo,H Bachacou,K E Varvell,J Tanaka,M P Giordani,A Sapronov,M C N Fiolhais,P F Harrison,O V Solovyanov,J Große-Knetter ,N Semprini‐Cesari ,P Laurelli,C Lapoire,D Rodriguez Rodriguez,M Davies,A Di Simone,J G Saraiva,J Kanzaki,A Pin ,T Kaji,I Massa,M Goblirsch-Kolb,T Mäshimo ,A Borisov,E Panagiotopoulou ,T Lenz,J Schwindling,G Spigo,J Van Nieuwkoop,S Campana,V Sorı́n ,C Schiavi,P Mogg,N Ishijima,L Liu,D A Milstead,A Wildauer,E Torrence,B 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doi:10.1140/epjc/s10052-017-4766-0

Abstract

Measurements of jet activity in top-quark pair events produced in proton–proton collisions are presented, using 3.2 fb^{-1} of pp collision data at a centre-of-mass energy of 13 TeV collected by the ATLAS experiment at the Large Hadron Collider. Events are chosen by requiring an opposite-charge emu pair and two b-tagged jets in the final state. The normalised differential cross-sections of top-quark pair production are presented as functions of additional-jet multiplicity and transverse momentum, p_{text {T}}. The fraction of signal events that do not contain additional jet activity in a given rapidity region, the gap fraction, is measured as a function of the p_{text {T}} threshold for additional jets, and is also presented for different invariant mass regions of the emu bbar{b} system. All measurements are corrected for detector effects and presented as particle-level distributions compared to predictions with different theoretical approaches for QCD radiation. While the kinematics of the jets from top-quark decays are described well, the generators show differing levels of agreement with the measurements of observables that depend on the production of additional jets.

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