Observation of Single Top Quark Production in Association with a Z Boson in Proton-Proton Collisions at sqrt[s]=13 TeV.

A M Sirunyan ,A Psallidas,P Sphicas,S Buontempo,R Del Burgo,P Faccioli,H Liao,R Ryutin,C Delaere,R Wilkinson,M Dragicevic,M Vit,A Nowack,S Jabeen,D Carlsmith,D Pitzl,A Perrotta,R Goldouzian,G Madigan,K Wichmann,P Connor,K Shchelina,F Beaudette,S Paramesvaran,G Alverson,D Loukas,A Hinzmann,H Rykaczewski,M Selvaggi,S Lezki,M Ahmad,P Azzurri,G Funk,D Ciangottini,A De Cosa,A Albert,S Sharma,G Kasieczka,S Norberg,A Sznajder,A Zabi,C Kar,Y Assran,C Neu,G Mavromanolakis,M Swartz,W Verbeke,E Fontanesi,T Roy,E Tarkovskii,S Breeze,K Jung,N Voytishin,D Quach,I Vorobiev,S Muthumuni,W Lohmann,R Patel,Z Liu,J Freeman,S Khalil,W Johns,K Ehataht,J Hollar,C Schwick,D Barney,S Damarseckin,N Dhingra,C Prieels,M Giffels,M Cepeda,N Manthos,F Ferri,S Mukherjee,G Mitselmakher,O Toldaiev,M Liu,E Palencia Cortezon,M Perfilov,B Marzocchi,P Silva,L Perniè,S Marcellini,M Meschini,S Piperov,A Toropin,S Cittolin,L Mirabito,M Ignatenko,P Siddireddy,R Bhardwaj,L Taylor,Z Gecse,P Luukka,W Erdmann,G Bagliesi,D Bertsche,S Mitra,A Lath,S Leontsinis,I Marchesini,A Godshalk,W Mcbrayer,I Azhgirey,I Golutvin,S Gelli,K Chatterjee,A Carnes,A Di Francesco,A Tapper,D Anderson,S Thüer,T Dorigo,A Massironi,A Karavdina,R Stone,E Ayala,T Lampén,R Paramatti,M Sun,F Golf,B Mcmaster,P Montagna,D Devetak,V Epshteyn,P Raics,S Dildick,R Di Maria,A Grohsjean,I Neutelings,L Favart,M Hadley,E Starling,A Tiko,M Rovere,A Uzunian,A Magitteri,D Arcaro,M Dobson,V Sola,E Hughes,P Mal,G Fedi,M Gavrilenko,L Uplegger,B Singh,E Usai,C Richardson,S Kaur,A Hart,F Pantaleo,A Messineo,P Parygin,C Maguire,K Burkett,V Chekhovsky,A Barnyakov,D Berry,T Lenz,C Amsler,A Pashenkov,A Apyan,P Barria,M Trovato,F Ferro,A Saggio,N Wardle,M Backhaus,P Janot,R Kogler,R Montalvo,A Parker,V Sordini,V Khristenko,A Zhokin,M Ressegotti,C Martin Perez,O Surányi,J Almond,D Abbaneo,L Caminada,F Vazzoler,J Han,M Herndon,C Albajar,S Boren,C Flores,N Bartosik,U Heintz,V Innocente,N Colino,S Mrenna,A Escalante Del Valle,L Uvarov,P Chang,G Ramirez-Sanchez,M Spiropulu,I Papakrivopoulos,J Wetzel,M Meena,L Skinnari,C Caillol,D Soldi,L Gray,F Gasparini,T Mulholland,G Bencze,Z Lesko,F Fallavollita,V Gavrilov,A Stepennov,M Merschmeyer,A Santocchia,J Havukainen,O Kukral,M Kaya,W Si,J Hauser,I Lokhtin,S Banerjee,C Grandi,R Bhandari,L Benussi,A Holzner,F Fienga,P Capiluppi,T James,Yu Andreev,Aashaq Shah,C Paus,V Hagopian,G Zevi Della Porta,S Durgut,M Dittmar,V Palladino,Sandra S Padula,I Papadopoulos,M Khakzad,E Meschi,M Vander Donckt,L Fiore,A Pozdnyakov,M Weinberg,B Kilminster,M Niedziela,J Conway,I Khvastunov,A Vartak,A Colaleo,A Perloff,D Noonan,M Diemoz,E Robutti,J Schwandt,D Majumder,V Murzin,A Elwood,L Borgonovi,T Orimoto,A Álvarez Fernández,D Marlow,K Sumorok,R Aggleton,M Pierini,U Husemann,W Van Doninck,K Doroba,J Zhang,S Nabili,C Heidegger,P Musella,L Lyons,G Cerminara,H Lattaud,D Gilbert,M Krammer,Y Sirois,M Bartók,E Olaiya,A Savin,N Srimanobhas,M Arneodo,S Cooperstein,T Hebbeker,S Lehti,Y Takahashi,S Harper,M Citron,M Dall’Osso,A Ranieri,G Saha,Ö Özçelik,P Moisenz,S Baur,M Velasco,N Akchurin,C Schiber,A Ledovskoy,D Gigi,G Oh,D Lelas,C Hill,J De Clercq,D Bourilkov,K Hatakeyama,D Gyun,J Sturdy,G Singh,M Górski,L Finco,O Kodolova,P Mandrik,T Reis,E Locci,A Bat,R Sacchi,D Saltzberg,G Negro,S Baidali,A Kayis Topaksu,T Mengke,N Pastika,M Kasemann,A Ruiz-Jimeno,H Nogima,S Rahatlou,L Pacher,H Sert,O Prokofyev,K Gill,S Grünendahl,A Soha,L Thomas,C Vander Velde,A Dabrowski,B Chazin Quero,R Erbacher,F Zhang,A Safonov,P Gianneios,D Sperka,I Dremin,C Kleinwort,G Karapinar,F Romeo,E Gülmez,V Valuev,E Carrera Jarrin,A De Wit,A Vilela Pereira,H Malbouisson,A Zanetti,M Cerrada,K Kousouris,F Micheli,J Keaveney,I De Bruyn,M Dünser,P Paganini,B Safarzadeh,A Kalogeropoulos,J Marco,M Dalchenko,A Pfeiffer,A Khan,K Wong,Y Cheng,S Abdullin,N Poudyal,C Botta,S Turkcapar,R Gerosa,D Fasanella,P Lariccia,R Bucci,E Paradas,S Colafranceschi,G Grenier,E Kennedy,N Demaria,D Bonacorsi,L Lista,N Eminizer,D Lange,M Wolf,E Kuznetsova,R Chistov,A Tsirou,Sh Jain,P Eerola,E Conte,V Dutta,M Zanetti,A Bylinkin,E Asilar,C Hensel,J Knolle,M Missiroli,D Mason,E Boos,P Vanlaer,A Cabrera,A Gilbert,M Zeyrek,C Seez,L Spiegel,A Lobanov,W Clarida,P Klabbers,H Brun,Y Mao,M Cremonesi,P Zalewski,R Cousins,P Das,E Garutti,R Kamalieddin,A Morelos Pineda,R Yohay,V Myronenko,H Reithler,F Hartmann,J Chaves,J Nachtman,J Olsen,M Barrio Luna,L Benato,J Linacre,A Shabanov,R Granier De Cassagnac,T Lindén,M Zeinali,D Green,V Blobel,B Roozbahani,T Ruggles,J Damgov,A Iuzhakov,P Spagnolo,T Esch,J Nash,L Levchuk,M Akbiyik,W Xie,F Mohamad Idris,K Borras,Q Python,K Beernaert,F Preiato,M Rodozov,M Guilbaud,B Vermassen,A Martelli,W Luo,C Wöhrmann,C Vernieri,B De La Cruz,I Puljak,U Kiminsu,Z Tu,N Lu,G Miniello,M Guchait,G Perrin,S Greene,C Collard,V Kumar,X Gao,A Titterton,R Radogna,I Bayshev,X Chen,N Leonardo,J Incandela,T Kamon,Y Wen,L Shchutska,I Babounikau,C Oropeza Barrera,G Fasanella,A Woodard,A Babaev,H Liu,J Hakala,E Migliore,A Jafari,R Syarif,L Kreczko,F Würthwein,L Dodd,S Sarkar,Y Ban,I Kravchenko,E Manoni,A Juodagalvis,M Haytmyradov,M Casarsa,J Mnich,M Olszewski,B Hong,E Voevodina,G Bakas,G Mandorli,U Gasparini,O Karacheban,M Misheva,A Savoy-Navarro,J Zhao,A Roy,L Ristori,D Pinna,W Lustermann,A Florent,G Rauco,D D’Enterria,J Rohlf,R Frühwirth,D Piccolo,S Mallios,A Byszuk,C Fernandez Bedoya,J Seixas,P Ronchese,T Perry,D Abercrombie,I Smirnov,S Dasu,K Lee,A Askew,Y Chen,K Lassila-Perini,F Simonetto,J Cuevas,A Cappati,S Undleeb,N Cartiglia,S Schumann,N Smith,I Mikulec,M Lethuillier,S Albergo,S Kudella,N Sur,J Li,M Guthoff,T Virdee,V Kutzner,I Zoi,P Thapa,M Maggi,G Sguazzoni,M D’Alfonso,M Flechl,V Veckalns,P Giacomelli,M Ruspa,A Muhammad,R Cavanaugh,C Heidemann,A Malakhov,S Pandey,N Mccoll,E Gottschalk,T Eichhorn,S Sekmen,S Fonseca De Souza,Th Müller,F Ricci-Tam,D Stuart,F Torres Da Silva De Araujo,J Rembser,A Elliott-Peisert,F Moortgat,C Tully,G Petrucciani,C Biino,F Rebassoo,M Osherson,C Erice,V Danilov,D Gelé,J Borg,S Kurz,K Hurtado Anampa,K Padeken,P Govoni,M Thiel,R Rusack,O Zenaiev,C Rogan,D Treille,A Vorobyev,G Hall,O Hindrichs,V Mossolov,C Harrington,R Klanner,J Zobec,Á Hunyadi,P Paolucci,O Bouhali,L Moroni,K Bloom,R Xiao,L Gouskos,O Behnke,A Skuja,A Givernaud,S Regnard,H Ni,R Venditti,M Cuffiani,D Marconi,C Snyder,D Winterbottom,A Ovcharova,S Orfanelli,A Raspereza,D Rosenzweig,H Zhang,R Arcidiacono,M Biasini,F Iemmi,L Litov,P Major,Q Wang,J.-C Fontaine,F Ball,P Piroué,H Qiu,V O’Dell,K Dilsiz,H Delannoy,K Mcdermott,M Kaur,G Vesztergombi,C Galloni,Z Chen,J Wittmann,A Saibel,S Keshri,H Kirschenmann,G Barbagli,K Nash,A.-C Le Bihan,Z Wang,A Al-Bataineh,K Harder,U Joshi,G Sultanov,J Steggemann,J Piedra Gomez,A Baden,L Silvestris,L Fanò,L Gutay,P Ma,S Hasegawa,R Castaldi,J Roberts,M Lohan,S Cho,M Kadastik,T Madlener,J Berryhill,G Landsberg,R.-S Lu,C Mclean,A.-M Magnan,A Tricomi,D Hsu,G Anagnostou,S Choudhury,N Dev,C Schomakers,D Olivito,M Hu,B Asavapibhop,G Walia,G Karathanasis,A Rose,B Blumenfeld,G 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Kovalchuk,W Carvalho,S Karmakar,O Davignon,M Zientek,M Melo De Almeida,Y Haddad,A Khukhunaishvili,S Dutt,T Dreyer,C Palmer,M Vidal Marono,S Maselli,M Dordevic,C Freer,P Levchenko,M Jones,K Deiters,J D’Hondt,K Manolopoulos,W Waltenberger,C Schäfer,I Pozdnyakov,M Danilov,P Bargassa,N Wickramage,J.-M Brom,C Reissel,F Cavallari,T Sakuma,B Ille,A Ghezzi,P Bunin,M Malberti,M Yalvac,C Madrid,P Lujan,L Giannini,M Gouzevitch,M Tadel,P Katsoulis,A Volkov,D Cieri,I Vila,M Komm,J Duarte,R Wolf,U Hussain,A Wightman,P Kontaxakis,A Meyer,P Busson,S Ha,L Russo,S Malik,M Walczak,A Beretvas,D Burns,T Järvinen,I Papavergou,P Jarry,A Rizzi,J Kieseler,J Karancsi,S Shmatov,B Maier,R Chawla,R Shevchenko,S Taroni,W Li,T Sarkar,C Roskas,R Harr,P Gunnellini,R Salvatico,V Andreev,D Hits,A Bundock,G Quast,A De Iorio,P Depasse,M Paganoni,A Bocci,K Mazumdar,T Camporesi,F Ravera,A Kamenev,X Zuo,A Kornmayer,A Zghiche,T Pook,J Pekkanen,L Li,M Delcourt,D Bhowmik,Y Wang,C Schwanenberger,U Sarica,K Kadija,Q Xu,S Brandt,S Padhi,A Morton,F Couderc,L Cadamuro,S Gninenko,S Gadrat,D Lincoln,N Saoulidou,M Monteno,C Beirão Da Cruz E Silva,J Alcaraz Maestre,P Tan,D Dutta,R Gupta,M Erdmann,M Radziej,S Dey,L Scodellaro,B Diab,D Zou,J Hiltbrand,M Aldaya Martin,M Stöver,M Meyer,N Menendez,Y Onel,S Ragazzi,M Ince,A Romero,B Gomber,P Everaerts,D Salerno,R Conway,A Tumasyan,S Thomas,W Lin,W Ko,D Sheffield,A Wisecarver,A Benaglia,A Baskakov,F Rezaei Hosseinabadi,D Krücker,K El Morabit,O Rieger,M Waqas,D Dobur,H Wang,H Stadie,A Purohit,H Wei,V Mariani,N Postiau,K Lamichhane,G Mittag,A Dermenev,M Heindl,A Apresyan,A Lelek,A Stahl,M Hohlmann,M Maity,B Kreis,J Taylor,A Kalinowski,P Checchia,D Kim,S Fiorendi,R Hirosky,A Staiano,B Wang,V Klyukhin,F Errico,T Wamorkar,P Priyanka,A Montanari,E Auffray,G Zumerle,S Lacaprara,F Meng,P Traczyk,R Caspart,E Manca,S Dittmer,T Mudholkar,B Mahakud,D Moran,S Jindariani,D Konstantinov,S Choi,N Lychkovskaya,M Albrow,D Spiga,P Sheldon,C Rovelli,H Tholen,B Francis,I Bachiller,R Rossin,A Kropivnitskaya,V Savrin,L Mastrolorenzo,H Prosper,O Turkot,I.-A Melzer-Pellmann,A Spiezia,M Pieri,J Multhaup,P Kyberd,R Hadjiiska,M Bharti,F Santanastasio,A Belloni,B Stieger,G Iaselli,T Bose,N Krasnikov,E Eskandari Tadavani,V Azzolini,P Baillon,P Cirkovic,C Wissing,A Di Crescenzo,M Nguyen,Z Hu,G Masetti,A Ahmad,J Rorie,S Ahuja,J Schulz,K Maeshima,T Arndt,D Spitzbart,A De Roeck,G Hanson,T Dimova,B Kiani,K Long,J Hanlon,C Fangmeier,M Kolosova,J Mejia Guisao,L Calligaris,M Mannelli,A Richards,C Henderson,G Touquet,V Daponte,B Burkle,C Bernet,A Bornheim,C West,A Starodumov,J Gilmore,S Laurila,S Flowers,D Nguyen,J Kunkle,M Goncharov,J Letts,G Paspalaki,M Pesaresi,C Foudas,G Safronov,R Horisberger,R D’Alessandro,C Battilana,S Nuzzo,M Van De Klundert,K Burt,V Okhotnikov,M Spanring,G Tonelli,J Martin Blanco,W Lange,S Freed,U Bhawandeep,J Mousa,P Gras,C Amendola,G Strong,N Sahoo,E Scott,M Franco Sevilla,M Olmedo Negrete,J Garcia-Ferrero,A Singh,L Viliani,P Vitulo,S Kaplan,K Matchev,G Chen,F Ambrogi,E Gallo,M Sharan,S Higginbotham,S Girgis,A Lanev,Y Musienko,D Pellett,A Karneyeu,C Mills,F Meijers,E De La Cruz-Burelo,N Daci,P Dauncey,A Delgado Peris,I Ojalvo,M Mulders,G Abbiendi,A Geiser,A Fagot,M Della Negra,S Wertz,S Nandan,D Creanza,S Rappoccio,R Fischer,A Castro,F Vazquez Valencia,H El Mamouni,M Presilla,O Baron,P Van Mechelen,M Masciovecchio,J Flix,M Shi,K Nam,F De Guio,L Orsini,A Attikis,U Goerlach,M Bianco,S Somalwar,S Tavernier,S Zaleski,E Bouvier,C.-E Wulz,M Mohammadi Najafabadi,K Kaadze,R Campanini,K Stenson,E Eren,T Ferguson,S Sen,T Schuh,D Wang,S Bitioukov,C Contreras-Campana,E Paganis,D Taylor,A Nayak,V Palichik,V Matveev,M Abbrescia,V Karimäki,A Cocoros,M Donegà,A Rosowsky,M Verweij,J Duarte Campderros,M Musich,T Tuuva,H Abdalla,P Avery,Y.-J Lee,A Saha,B Boimska,L Kardapoltsev,A Dominguez,U Behrens,V Sharma,M Verzetti,M Alhusseini,D Contardo,I Laflotte,C Autermann,N Bacchetta,U Dosselli,J Heideman,D Tsitsonis,S Spanier,A Bodek,A Canepa,M Seidel,J Fay,C Mueller,M Planer,C Riccardi,A Nehrkorn,D Colling,A Hervé,N Dupont,A Ebrahimi,C Bravo,A Kaur,C Campagnari,C Laner,T Gunter,C Nicolaou,S My,H Siikonen,G De Lentdecker,H Bakhshiansohi,M De Mattia,S Dutta,K Skovpen,K Ranjan,B Pavlov,I Katkov,V Oreshkin,B Mesic,K Vellidis,Y Go,N Skatchkov,P Petkov,A Lopez Virto,S Slabospitskii,A Mehta,V Blinov,J Strait,K Klein,S Schnetzer,N Chanon,R Walsh,U Langenegger,M Konecki,M Weber,J Pilot,M Klute,A Boletti,L Guiducci,G Riley,A Nikitenko,T Bergauer,N Varelas,X Niu,C Dozen,N Parashar,K Kothekar,O Hlushchenko,M Tytgat,R Breedon,V Jha,G Della Ricca,P Harris,D Teyssier,I Pedraza,D Sosnov,B Dorney,B Bilin,D Roy,A Moeller,R Salerno,S Gascon,S Summers,J Tao,A Gelmi,J Hirschauer,M Gul,S Nahn,K Theofilatos,A Gurrola,E Focardi,A Shtipliyski,N Odell,P Lenzi,A Mestvirishvili,H Keller,B Grynyov,R Potenza,A Dimitrov,I Gorbunov,A Rastogi,C Dorfer,G Steinbrück,A Baty,B Clerbaux,B Chiarito,G Krintiras,H Qu,B Penning,K Tatar,M Haranko,J Rander,G Smith,D Curry,T Ferbel,A 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Vidal,R Vilar Cortabitarte,A Marinov,D Tlisov,W De Boer,G Kole,J Roskes,P Shukla,R Schöfbeck,S Bianco,S Kyriacou,F Cossutti,P Kumari,A Pyskir,S Oliveros,C Calabria,A Triossi,F Pandolfi,S Malhotra,S Chenarani,J Tuominiemi,J Pazzini,J Alexander,T Kress,A Mohammadi,K Schweiger,B Galinhas,C Quaranta,N Trevisani,S Chauhan,N Suwonjandee,J Lange,M Marionneau,F Ligabue,C Asawatangtrakuldee,Sa Jain,C Cecchi,P Robmann,M Tosi,G Flouris,M Schönenberger,R Mulargia,D Klein,T Frueboes,R Gonzalez Suarez,M Verzocchi,S Zhang,F Palla,K Shi,E Brondolin,S Cometti,F Fabbri,S Hagopian,K Tos,E Tuominen,J Chu,L Pape,A Stakia,G Selvaggi,D Stolp,N Marinelli,F Boran,G Dissertori,Q Ingram,D Overton,E Halkiadakis,M Azarkin,I Iashvili,Y Jo,D Trocino,A Agapitos,M Misiura,T Mitchell,F Lagarde,S Carrillo Moreno,S Ghosh,M Toms,H Li,D Cussans,S Narayanan,J Pata,F Blekman,Ashok Kumar,S Folgueras,A Johnson,V Ciulli,A Kyriakis,M Preuten,J.-P Merlo,V Perelygin,N Tyurin,J Lee,A Korytov,A Dasgupta,M Naseri,R Sharma,A Modak,P 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Reyes-Almanza,P Thomassen,A Panagiotou,J Erö,Y Iiyama,L Cristella,C Smith,Y Feng,F Fabozzi,Z Tsamalaidze,M Jansová,G Galati,F Xia,Emine Gurpinar Guler,P Schleper,E Vlasov,M Wang,V Kim,A Kapoor,J Hegeman,H Jung,Ravindra Kumar Verma,T Sculac,C De Oliveira Martins,M Grothe,M Gola,P Saxena,B Francois,T Cheng,A Kharchilava,L Sulak,B Bylsma,S Dugad,J Brandstetter,Y Ivanov,J Kim,R Lander,N Faltermann,G Organtini,S Mersi,O Bondu,D Gonzalez,N Strobbe,S Nourbakhsh,B Jayatilaka,E Tiras,R Covarelli,L Wang,C Jessop,J Varela,P Bortignon,G Flügge,T Strebler,A Beschi,D Brzhechko,J Richman,N Pastrone,Z Tao,M Raidal,S Bhowmik,V Karjavine,A Giammanco,P De Barbaro,C Hwang,D Smith,S Gennai,M Jeitler,V Monaco,G Dezoort,S Lo Meo,A Di Mattia,J Bowen,M Kovac,D Yu,S Linn,P Elmer,A Magnani,M Savitskyi,K Piotrzkowski,G Benelli,S Lammel,R Eusebi,R Mankel,A Sobol,I Krätschmer,C Charlot,S Pigazzini,I Vai,J Dolen,R Janjam,S Das,A Venturi,N Zaganidis,O Pooth,E Monteil,C Civinini,S Sánchez Navas,G Eckerlin,E Yazgan,I 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Tkaczyk,P Rumerio,T Reitenspiess,J Strologas,J Hardenbrook,C Grab,A Reimers,E Wolfe,G Codispoti,A Yagil,N De Filippis,Q Li,C Sciacca,A Zucchetta,F Matorras,A Lefeld,L Dudko,K Mandal,M Menichelli,T Williams,S Afanasiev,K Androsov,R Chierici,D Menasce,R Dell’Orso,S Sagir,J Haller,S Xie,M Felcini,O Gutsche,N Tonon,E Barberis,A Belyaev,S Luo,E Di Marco,V Bhatnagar,S Shulha,M Galanti,J Eysermans,B Klima,E Belchior Batista Das Chagas,M Oglakci,M Paulini,S Troshin,E Laird,G Mantovani,N Neumeister,A Bermúdez Martínez,R Wallny,S Chatterjee,Q Hassan,P Berger,J Goh,K Lannon,M Chen,C Lourenço,C Uribe Estrada,E Butz,A Dierlamm,R Clare,Z Demiragli,M Reichmann,L Antonelli,H Acharya,W Ji,P Meridiani,A Castaneda Hernandez,T A Gómez Espinosa ,M C Duran-Osuna ,Mohd Adli Bin Ali ,Gabriella Pugliese ,H Castilla‐Valdez ,V Lemaı̂tre ,G Hamel De Monchenault ,G Pásżtor ,H A Salazar Ibarguen ,B Işıldak ,G G Da Silveira ,R R Betts ,S M Tan ,Antônio Rossi ,L J Sanchez Rosas ,F J M Geurts ,M U Mozer ,J Fernández 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doi:10.1103/physrevlett.122.132003

Abstract

The observation of single top quark production in association with a Z boson and a quark (tZq) is reported. Events from proton-proton collisions at a center-of-mass energy of 13TeV containing three charged leptons (either electrons or muons) and at least two jets are analyzed. The data were collected with the CMS detector in 2016 and 2017 and correspond to an integrated luminosity of 77.4fb^{-1}. The increased integrated luminosity, a multivariate lepton identification, and a redesigned analysis strategy improve significantly the sensitivity of the analysis compared to previous searches for tZq production. The tZq signal is observed with a significance well over 5 standard deviations. The measured tZq production cross section is σ(pp→tZq→tℓ^{+}ℓ^{-}q)=111±13(stat)_{-9}^{+11}(syst) fb, for dilepton invariant masses above 30GeV, in agreement with the standard model expectation.

Highlights

Compared to the non-boosted decision trees (BDTs)-based lepton identification used in the previous analysis [7], the selection efficiency for prompt electrons improves by up to 12% (8%), while rejecting more nonprompt leptons by a factor of approximately 2 (8) in simulated events
The ZZ background normalization is constrained via a control data sample of four-lepton events, in which there are two opposite sign and same flavor (OSSF) pairs with invariant masses close to that of the Z boson
The probability for a loose nonprompt lepton to pass the tight selection requirements is measured as a function of its pT and jηj in a control data sample of quantum chromodynamics (QCD) multijet events, rich in nonprompt leptons

Summary

Introduction

A stringent requirement is placed on the BDT output, resulting in a selection efficiency of 85% (92%) per prompt electron (muon) with pT > 25 GeV passing the prerequisite selection criteria, as measured in simulated tZq events. Compared to the non-BDT-based lepton identification used in the previous analysis [7], the selection efficiency for prompt electrons (muons) improves by up to 12% (8%), while rejecting more nonprompt leptons by a factor of approximately 2 (8) in simulated events.

Results

Conclusion