Search for top-squark pair production in the single-lepton final state in pp collisions at $\sqrt{s}=8\ \mathrm{TeV}$

S Chatrchyan,D Wang,B Gomber,V Popov,K S Lee,G G Da Silveira,A Mohammadi,S Girgis,A Modak,A De Benedetti,H R Hoorani,F Montecassiano,A Petrukhin,S Malik,M Merola,M S Kim,J Haley,D Kovalskyi,P Lamichhane,S Lehti,M A Shah,N Skhirtladze,D Loukas,C H Shepherd-Themistocleous,H Brun,I R Tomalin,S Khalid,J Lee,M Zakaria,T Chwalek,M Jo,N Hörmann,K Padeken,D Bonacorsi,K Chatterjee,S Naumann-Emme,R Rahmat,J Nachtman,C Jessop,S Viret,S Luyckx,M Görner,M Diemoz,M Schröder,M I Asghar,P Fabbricatore,F Würthwein,E Usai,L Wendland,A Shrinivas,J Letts,C Jorda,S Shrestha,T Sakuma,G Majumder,S Arora,J P Chou,S Harper,M Olschewski,A Montanari,J Wetzel,A Zhokin,D Del Re,M De Gruttola,J Bochenek,A Kyriakis,A Nowack,M Selvaggi,A Kalinowski,M Simon,J Callner,D Berry,R Walsh,K Ranjan,S Belforte,D Tlisov,L Scodellaro,J Whitmore,E Sexton-Kennedy,C Barth,L Foà,M Weber,H Schettler,S Ragazzi,M Johnson,D Krofcheck,D Dutta,A Kasmi,M Galanti,S Somalwar,A A Abdelalim,A F Barfuss,P Hebda,M A Reyes-Santos,T Khurshid,J Salfeld-Nebgen,C Lourenço,D Duggan,Y Fu,P Faccioli,M Hohlmann,P Moisenz,S Fiorendi,D Krücker,S Abdullin,F Nowak,G M Chen,T Lomtadze,W Sun,D Benedetti,P Wittich,X Quan,L Spiegel,R R Betts,G Flügge,A Panagiotou,T Martins,N Pietsch,T Kress,D Stickland,D Sperka,V Veeraraghavan,S Salur,F J Ronga,G R Snow,A Calamba,A G Delannoy,K Sung,M Edelhoff,K Sogut,L Pape,R Lander,G M Bilei,J J Brooke,D Majumder,J Haupt,J D’Hondt,J Conway,W To,J Flix,L Gray,A Skuja,Y Zheng,S Buontempo,M Erdmann,R Venditti,R Schmidt,M Margoni,A Avetisyan,S Mersi,E C Chabert,J St John,M Kasemann,M Kazana,C Park,S Panwalkar,M Dragicevic,F Simonetto,J Babb,L Tourtchanovitch,P Vischia,L Lyons,R Breedon,M Eads,A York,C Campagnari,A Santocchia,K F Chen,H Breuker,Y Kim,J Leonard,J Tuominiemi,K Stenson,S Paoletti,D Puigh,T Perry,G H Hammad,D Piccolo,M M Baarmand,S Ahuja,J Alimena,M Stoye,T Libeiro,H Gamsizkan,M Giffels,K Dilsiz,S I Cooper,V Monaco,H Nogima,R Schöfbeck,A Degano,J E Kim,K Sudhakar,M Tytgat,D Cussans,K F Johnson,Arun Kumar,S Meola,L Fanò,C Riccardi,L Malgeri,A Perieanu,L Lusito,M Pesaresi,J Varela,D Pagano,A Pfeiffer,T Peiffer,V Golovtsov,M E Pol,S Lacaprara,S Bose,A Tiko,A Bodek,G Mavromanolakis,M I Josa,G Giurgiu,I Volobouev,A Harel,S Semenov,N Parashar,S F Novaes,J Marco,G Mesyats,M Casarsa,D Acosta,S Choudhury,P Janot,S Vavilov,L Tauscher,J Zabel,D Renker,D Duchardt,A Raval,T Miceli,A Levin,I Kravchenko,R Lipton,D Barge,F Chlebana,M Pegoraro,D Polic,N Lychkovskaya,C Rovelli,M D’Alfonso,I Iashvili,M C Fouz,Y Choi,W Clarida,V Sordini,F Bachmair,H Reithler,M Kirakosyan,A Lanev,E Tuominen,A Geiser,T Schum,L Bianchini,J Pilot,M Kenzie,G Smith,S Lowette,D Lange,P Kokkas,A Toropin,C Kleinwort,A Fanfani,S K Swain,W Bertl,M Goncharov,P Azzi,J Duarte,P Harris,E Barlas,K Freudenreich,G Fedi,M Vutova,N Sen,S Brochet,P Bartalini,I Smirnov,L Mundim,T Lindén,I Chakaberia,S Gennai,E Olaiya,W J Womersley,A Bornheim,E Kuznetsova,A Nayak,P Tan,A Leonidov,R Montalvo,J L Faure,W Lin,Y Kuessel,Y Onel,C Roland,C Grandi,F Hoehle,S Ghosh,J Nash,M Pieri,N Bartosik,E Gottschalk,S Dasu,R Lucas,A Yagil,S Braibant-Giacomelli,M Meschini,N Suwonjandee,W Behrenhoff,M Serin,M Tadel,G Bolla,A Tsirou,V Sharma,A Schmidt,S Khalatyan,S Ganguly,R Castaldi,J Tucker,L Millischer,D Trocino,L Kreczko,Y Hsiung,S Röcker,U Langenegger,M Bergholz,A Kubik,L Rebane,T Danielson,S Beranek,A Abdulsalam,G Hanson,C Autermann,P Silva,F Gasparini,J Russ,P Siegrist,J Mousa,J F Low,S Bitioukov,R Chierici,J Chasserat,G Schott,S C Tonwar,I Macneill,I N Naranjo,W De Boer,R M Harris,C Favaro,A Olbrechts,M Misiura,P Everaerts,M Pimiä,B Ille,D Contardo,M Meneghelli,J Ott,M Giunta,C H Jiang,A Kraan,M Kress,P Dauncey,E Yazgan,C Civinini,Y H Chang,R Klanner,A Deisher,M Gosselink,M Grassi,R Volpe,J W Gary,M Chan,J Veverka,I Vila,M Albrow,P Van Mulders,B Calvert,A Schizzi,C Seitz,W H Smith,M Park,A Apresyan,G P Siroli,E Meschi,S Gascon,D Noonan,S Won,J Zhang,D Wright,S M Etesami,F Raupach,W J Spalding,V Murzin,C Heidemann,A Bocci,D Colling,A Gribushin,C Schäfer,D Gigi,A Taurok,I Svintradze,K Jung,Y Roh,E M Gregores,E Sudano,X Aslanoglou,H Seo,Sh Jain,U Akgun,F Glege,N Mirman,J Han,V Palichik,P Verwilligen,P Verdier,M Malek,V M Ghete,B Fabbro,W Wolszczak,C Vernieri,Y Ma,K Hatakeyama,R Wolf,H Xiao,P Van Hove,G Benelli,V Timciuc,R Carlin,C Nägeli,D Marlow,C Cowden,T Aziz,D Menasce,S Costa,P Paganini,G Roland,E Berry,T Aliev,S R Wagner,D Vishnevskiy,D Troendle,A Dimitrov,L Thomas,F Moortgat,T Kypreos,W Van Doninck,S W Li,V Innocente,S Metson,A Kharchilava,M Menichelli,M Biasini,R Guida,J.-M Brom,R Nandi,F A Dias,M Grothe,P Eerola,Z Hatherell,J Seixas,B Cox,L Favart,N Zaganidis,Y D Oh,M Chasco,J Bendavid,V Epshteyn,F Cavallari,C Nicolaou,G Della Ricca,D Carlsmith,L Litov,H Saka,C Fabjan,B Betchart,I Redondo,A Askew,B Wittmer,A Graziano,B Klein,P Kyberd,P H Butler,F Romeo,D Rabady,W Xie,G Petrillo,J Wood,K Borras,E Laird,W Dominik,A Branca,A Moeller,S A Koay,B Dorney,M Spiropulu,A Sparrow,E Garutti,C Amsler,N Marinelli,S Malhotra,P Sorokin,Y J Lu,H Wolfe,N Strobbe,X Shi,N Pozzobon,N Mohr,B Lutz,S Beauceron,A Tapper,E Brownson,A Juodagalvis,A Florent,M Bluj,R G Kellogg,A Gozzelino,H Bahtiyar,L Benucci,Y M Tzeng,K Ozdemir,A Luthra,K Sumorok,C Lucas,A Whitbeck,Y Guo,J Lingemann,G Bencze,V Gavrilov,A Pompili,I Grigelionis,V Kim,R Houtz,K Gill,X Wang,H Stadie,S Padhi,P Giubilato,L Calligaris,C Delaere,G M Dallavalle,A Tropiano,E Focardi,A Everett,J Linacre,C M Kuo,J Tao,M Della Negra,V Dutta,R D’Alessandro,F Ratnikov,R Ulrich,C Tully,A T Meneguzzo,P Elmer,C S Moon,G Zumerle,E Ron,C Böser,M Lebourgeois,C Silkworth,D Evans,D J Kong,M Seidel,P Giacomelli,K Maeshima,A Giammanco,E Di Marco,C Contreras-Campana,R Erbacher,J Wagner-Kuhr,I Gorbunov,S Bolognesi,T Ma,Th Müller,G Rolandi,E Appelt,R Remington,T Rodrigo,S Oliveros,M Herndon,V Maroussov,D Spiga,M Dittmar,C Mariotti,M Choi,W Waltenberger,P Eller,X Janssen,D Hidas,V Azzolini,G De Lentdecker,P G Mercadante,P Jandir,V Klyukhin,D Petyt,M Dubinin,G Polese,P Lujan,S Jindariani,O Gutsche,W Lustermann,A O M Iorio,J Freeman,V O’Dell,B Bilki,U Husemann,W Kiesenhofer,I Evangelou,C Dietz,D Bisello,G Franzoni,W Busza,J C Yun,B L Winer,U Nauenberg,M Kadastik,B Marangelli,O Prokofyev,P Geffert,M Wang,T Camporesi,S Casasso,U Heintz,S Nourbakhsh,R Sever,V Hagopian,L M Pant,P Chang,C Wissing,K Lipka,M Cardaci,C Rohringer,J Sibille,J Cuevas,P Petkov,P Vanlaer,W Lohmann,D Green,M Klute,H Park,V Blobel,J Thompson,A Léonard,A Peterman,P D Luckey,D Gelé,V Chiochia,F Wang,P Busson,R Frühwirth,G Abbiendi,N Tyurin,F Meijers,M Donegà,M Cerrada,J Klukas,C Willmott,A Raspereza,S Boutle,V Genchev,A Kropivnitskaya,A Sobol,M Gavrilenko,C Neu,M Zeise,S Sumowidagdo,R Kroeger,A Savoy-Navarro,C Ferro,C Seez,O Evdokimov,C Riedl,W Andrews,B Stieger,M Grimes,A Ostapchuk,N Cavallo,W Erdmann,G Tonelli,F Pandolfi,E Conte,F Cossutti,I Vorobiev,J Hollar,A Custódio,K Kanishchev,M Weinberg,L Zhang,W D Zeuner,A Ershov,M Dobson,D Horton,J Goh,J R Vlimant,A Rizzi,A T 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Nash,F Nguyen,D Hits,C West,D Ralph,F Drouhin,A C Mignerey,L Perniè,D Favart,Y Pakhotin,P Paolucci,A Anastassov,J R Patterson,A Baden,F L Navarria,M Azarkin,M W Arenton,J G Bian,N V Tran,H Mermerkaya,N Beliy,J Luetic,K Bloom,N Colino,J.-C Fontaine,G Anagnostou,H Vogel,S Walsh,L Xu,P Musella,J Velkovska,R Moser,C A Bernardes,M Sigamani,W Flanagan,M Müntel,A Sharma,E Ntomari,L Silvestris,M Friedl,G B Cerati,T Orimoto,A Mott,S Nahn,M Velasco,P Bortignon,E A De Wolf,B Lee,J F Benitez,A Hunt,M Dalchenko,G P Di Giovanni,Y Chen,L Uvarov,S Jabeen,E A Albayrak,D Futyan,J Hugon,T Y Kim,M Girone,D Strom,D Barney,R K Shivpuri,M Sasseville,N Cartiglia,N Akchurin,P Squillacioti,D Sabes,S Spanier,D Liko,S Rappoccio,I Lazzizzera,C Grab,P Mcbride,D Ryckbosch,J Turkewitz,M Plagge,M Deniz,J Alexander,G Iaselli,E E Kangal,J Sturdy,D Abbaneo,A Ruiz-Jimeno,D Cline,J Yoo,M Turner,R Gray,R Paramatti,N Dupont-Sagorin,S Dugad,M Michelotto,J E Cole,W Wu,A Khukhunaishvili,V Cherepanov,W Hopkins,L Sulak,A Perloff,H Perrey,K Y Kao,B Kargoll,G Quast,J Thomsen,S Xie,J Slaunwhite,S D Worm,B Klima,S My,C Palmer,M Costa,V Karjavin,R Campanini,S Sanders,M Mulders,K M Ecklund,T Frueboes,H J Simonis,N Neumeister,Z Staykova,J Berger,A Giassi,J Lazo-Flores,K Matchev,R Rossin,M Hildreth,H Bakhshiansohi,C Rogan,N Nishu,J Härkönen,M Dünser,D C Son,C Fantasia,U Goerlach,J Damgov,S Ochesanu,J Incandela,F Santanastasio,A Castro,G S F Stephans,Z Hu,Y Maravin,M Passaseo,J G Branson,K Klein,H El Mamouni,R Horisberger,S Rogerson,P R Hobson,C Botta,I Yu,H S Chen,D H Kim,T Sarangi,F Odorici,G Selvaggi,P Depasse,B Michlin,X Meng,S Gollapinni,V Oreshkin,M J Kortelainen,J Sammet,J Liao,K Flowers,H Kim,M Niegel,H Rohringer,E Tiras,A P Singh,H Van Haevermaet,P Jindal,J Fulcher,A Perrotta,I Marchesini,A.-C Le Bihan,C Hartl,P Kreuzer,J Heilman,R Clare,S Troshin,G Sguazzoni,R Y Zhu,A Mohapatra,P Juillot,A Fahim,H Sakulin,A Ferrando,Y Sirois,M Peruzzi,P Hidas,G Steinbrück,S Piperov,G Christopher,G Davies,R Arcidiacono,C Mironov,N Pastrone,L Gauthier,M Ruspa,M Ahmad,H D Yoo,J S Werner,G Bagliesi,M Feindt,G Auzinger,H Weber,B Blumenfeld,S Maruyama,T Williams,W T Ford,F Couderc,B Clerbaux,N Saoulidou,M Ata,H W K Cheung,A Volkov,J Robles,C Newman-Holmes,A Saha,M A Mahmoud,E Daubie,G Hall,J Karancsi,M Bontenackels,K Nirunpong,P Gras,N Pacifico,D A Sanders,A Ledovskoy,R D Field,V Sola,D Leggat,J Goodell,F Yumiceva,A Uzunian,G Dissertori,K M Chan,G P Heath,I Katkov,Z Wang,M Marone,V Smirnov,R Ruchti,T Caebergs,D Leslie,R Eusebi,M Segala,D Klingebiel,R T D’Agnolo,L Barbone,D Bortoletto,F Beaudette,L Orsini,P Lecoq,H Liu,M Arneodo,K Mazumdar,O Bondu,L Brigliadori,P Zalewski,A Kamenev,V Krutelyov,A Thea,J F De Trocóniz,N Demaria,N Chanon,K Deiters,I Fisk,S Bansal,S Petrushanko,B Rahbaran,V Halyo,M Geisler,E Schlieckau,K Harder,N Wickramage,S Malvezzi,J.-L Agram,S H Chuang,A Pashenkov,M Naimuddin,Zero J Kim,K Heine,A Adair,I Azhgirey,G Karapostoli,A Potenza,N Almeida,A J Bell,P Miné,G Singh,J Bunn,R Dell’Orso,D D’Enterria,A Dominguez,J L Rodriguez,S Mrenna,J R Komaragiri,G Bruno,M Gouzevitch,S Baffioni,B Calpas,D M Newbold,D R Claes,E Stiliaris,T Hreus,A Vorobyev,M Lethuillier,R Patel,P Schlein,P Thomassen,S Dildick,C Brew,A Tatarinov,L Moroni,B Safarzadeh,J Hauser,J G Shiu,F Thyssen,S Wasserbaech,S Ganjour,Y Yilmaz,I.-A Melzer-Pellmann,F Fiori,I C Park,C Albajar,I Bayshev,D Baumgartel,T Pearson,M Cutajar,E Gallo,P Sharp,G A Pierro,V Knünz,F Ferri,K Gabathuler,N Leonardo,G Bauer,W Li,S P Ratti,R Covarelli,W Zou,P Baringer,S Griffiths,J Chen,M Takahashi,N Shumeiko,A Tricomi,D A Belknap,V Valuev,G Safronov,C Henderson,S Hagopian,T Weiler,J Keaveney,R Castello,R Hirosky,M Tripathi,M Kovac,C Ochando,S Paramesvaran,D J Hofman,A Knutsson,C Hill,I Suarez,A Belyaev,G Cerizza,R Frazier,J Gronberg,W A Khan,P Luukka,A Korytov,D J Karmgard,K Piotrzkowski,A Savin,B Pavlov,M Musich,M Searle,D Fasanella,P Symonds,D Meister,H Jung,A Brinkerhoff,L Fiore,G Apollinari,M Kaya,E Salvati,A 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Locci,J Fan,C Collard,C Maguire,C La Licata,C Vuosalo,S Kailas,U E Surat,Y Ban,J Dittmann,I Asin,N Cripps,G Breto,B Snook,B Roland,W Johns,S Dutta,H Enderle,S Stoynev,P Gunnellini,P Rumerio,Z Meng,D Pitzl,A Bean,L Apanasevich,M Paganoni,S Tuo,P Saxena,G Rakness,A Hinzmann,M Snowball,J Ellison,V Chetluru,J Richman,I Topsis-Giotis,A Burgmeier,A Ferapontov,M Stein,P Goldenzweig,Z Wan,M Kirsanov,R Carroll,M Malberti,T Y Ling,R Cousins,P T Cox,S Banerjee,M Fisher,M Z Mehta,P R Dudero,J C Sanabria,A Kalogeropoulos,A Stahl,B Hooberman,S Schnetzer,B Francis,T Christiansen,B P Padley,M Bachtis,S Sekmen,M Sharan,C Caillol,S Simon,E Contreras-Campana,R Wallny,U Grundler,T Dorland,W Funk,G N Kim,J Hays,M De Palma,D Toback,F Fabozzi,A Snigirev,R Wilken,C Asawatangtrakuldee,A Venturi,J G Acosta,G Kole,S J Qian,M Jones,G Organtini,P Nef,E Barberis,J Rander,R.-S Lu,J Hegeman,S Dooling,D Denegri,T Kamon,S Wayand,L Taylor,H Kalakhety,C Sander,J Pela,M Krämer,A Pozdnyakov,A Campbell,T Sinthuprasith,C 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Haas,P Traczyk,J Marrouche,H Malbouisson,M Shoaib,V Matveev,S Senkin,J Santaolalla,S B Beri,A Malakhov,G A Alves,P Van Mechelen,R Mankel,V Khotilovich,K Rabbertz,E Robutti,N Magini,L Dudko,A Poll,M Swartz,L A T Bauerdick,B Asavapibhop,K Kovitanggoon,T Dahms,M Ignatenko,L Mucibello,R Redjimi,D Pellett,S Cihangir,J B Singh,R Doesburg,I A Cali,M Yang,S Di Guida,K Theofilatos,T Ferguson,G Wrochna,Y Iiyama,D Stuart,C Mesropian,Y Musienko,A Radi,S Folgueras,A M Sirunyan,K Rose,F Ricci-Tam,D H Moon,V Karimäki,S Chauhan,F Matorras,F Margaroli,K Mishra,R Conway,G Lungu,D C Miner,F M Stober,M Pierini,L Masetti,G Petrucciani,A Nürnberg,W.-S Hou,L Mirabito,D Teyssier,L Quertenmont,A Bhatti,G Masetti,I Puljak,T Bose,M T Grippo,I Ross,W Luo,A Zabi,O Kodolova,J Pazzini,M Rovere,M Yücel,D J A Cockerill,V Kozhuharov,R Fischer,G Flucke,M De Mattia,T Virdee,P Robmann,A Svyatkovskiy,F Meier,W Reece,G Vesztergombi,H Arfaei,M Felcini,A Lath,B Bilin,S Mukherjee,D Bourilkov,M Luk,M T Lucchini,R M Chatterjee,J 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,Rebekka Sophie Höing ,C B Martin ,Y S Gao ,C Martínez Rivero ,B Gomez Moreno ,В Сулимов ,A Morelos Pineda ,D Jang ,P Lobelle Pardo ,A Kayis Topaksu ,S Bilmiş ,Р Тенчини ,F Pauß ,A Sanchez ,W L Prado Da Silva ,M Zieliński ,F Nessi‐Tedaldi ,В Качанов ,O Long ,Rg De Cassagnac ,J Pálinkás ,R López-Fernández ,Verena Ingrid Martinez Outschoorn ,A Lopez Virto ,G Gökbulut ,H A Salazar Ibarguen ,M Aguilar-Benı́tez ,H Castilla‐Valdez

doi:10.1140/epjc/s10052-013-2677-2

Abstract

This paper presents a search for the pair production of top squarks in events with a single isolated electron or muon, jets, large missing transverse momentum, and large transverse mass. The data sample corresponds to an integrated luminosity of 19.5 inverse femtobarns of pp collisions collected in 2012 by the CMS experiment at the LHC at a center-of-mass energy of sqrt(s) = 8 TeV. No significant excess in data is observed above the expectation from standard model processes. The results are interpreted in the context of supersymmetric models with pair production of top squarks that decay either to a top quark and a neutralino or to a bottom quark and a chargino. For small mass values of the lightest supersymmetric particle, top-squark mass values up to around 650 GeV are excluded.

Highlights

IntroductionThe standard model (SM) has been extremely successful at describing particle physics phenomena
The standard model (SM) has been extremely successful at describing particle physics phenomena. It suffers from such shortcomings as the hierarchy problem, where fine-tuned cancellations of large quantum corrections are required in order for the Higgs boson to have a mass at the electroweak symmetry breaking scale of order 100 GeV [1,2,3,4,5,6]
This paper describes a search for the pair√production of top squarks using the full dataset collected at s = 8 TeV by the Compact Muon Solenoid (CMS) experiment [7] at the

Summary

Introduction

The standard model (SM) has been extremely successful at describing particle physics phenomena It suffers from such shortcomings as the hierarchy problem, where fine-tuned cancellations of large quantum corrections are required in order for the Higgs boson to have a mass at the electroweak symmetry breaking scale of order 100 GeV [1,2,3,4,5,6]. Large Hadron Collider (LHC) during 2012, corresponding to an integrated luminosity of 19.5 fb−1 This search is motivated by the consideration that relatively light top squarks, with masses below around 1 TeV, are necessary if SUSY is to be the natural solution to the hierarchy problem [8,9,10,11,12]. The two neutralinos and the neutrino from the W decay can result in large missing transverse momentum (ETmiss)

Signal and background Monte Carlo simulation

The CMS detector

Object definition and event preselection

Kinematic quantities

Signal region definition

BDT signal regions

Cut-based signal regions

Signal regions summary

Background estimation methodology

Control region studies

Systematic uncertainties of the background prediction

Interpretation

10 Summary

Findings

Further information about model interpretations

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Journal: Zeitschrift für Physik C: Particles and Fields	Publication Date: Dec 1, 2013
Citations: 244	License type: cc-by

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Search for top-squark pair production in the single-lepton final state in pp collisions at $\sqrt{s}=8\ \mathrm{TeV}$

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Search for top-squark pair production in the single-lepton final state in pp collisions at $\sqrt{s}=8\ \mathrm{TeV}$

Abstract

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Summary

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