First measurement of the underlying event activity at the LHC with $\sqrt{s} = 0.9$ TeV

V Khachatryan,J.-M Brom,A Flossdorf,J Bernardini,J Babb,W Funk,P Schieferdecker,G H Hammad,N Mohr,Y Ma,A Solano,C Tully,N Almeida,J Muelmenstaedt,L Apanasevich,Y Yilmaz,J Letts,V Veeraraghavan,G B Cerati,J Lee,P Depasse,W Lin,D Dammann,S Wimpenny,V Chetluru,D Menasce,I.-A Melzer-Pellmann,A Gurrola,R Eusebi,N Redaelli,L Perrozzi,B C Choudhary,C Henderson,J Williams ,K Deiters,A.-C Le Bihan ,S Dugad,E Friis,G Roselli,M Marionneau,S Greder,A Romero,I P J Shipsey ,D Acosta,S Maselli,B Betchart,G Broccolo,A S Yoon,S Simon,F Thyssen,P Wittich,Min Yang ,P Cushman,P Sheldon,Z L Trocsanyi,S Carrillo Moreno ,E E Kangal,S Y Jun,C Veelken,F Ptochos,Y Choi,A Harel,H Topakli,S Tosi,A Marinov,M Ruspa,M Marone,O Boeriu,G A Alves,M N Bakirci,O Hindrichs,S Dutta,T Lindén,A Perieanu,A Korytov,F Simonetto,Y Güler,J Thomsen,E Eşkut ,A Honma,Hans Hoffmann ,P G Ferreira Parracho,D Lomidze,A Giammanco,M Kossov,L Tauscher,J Slaunwhite,J Sibille,Z Hu,H El Mamouni ,G Organtini,D Nguyen,T Signal,D De Jesus Damião ,T Ma,L Boldizsár ,U Joshi,C Saout,X T Huang,H Méndez ,G Zito,G Wrochna,G Bolla,F L Navarria,W T Ford,S Ahuja,Z Gecse,W To,P Jindal,A M Sirunyan,R Jussen,E Pérez ,T Schum,M Ćwiok ,G M Bilei,C J Edelmaier,I Smirnov,K S Lee,A Skuja,N Béni ,L K Gibbons,S Park,A García-Bellido ,G Petrucciani,J Ribnik,C N Nguyen,J Damgov,A Cimmino,W Sun,J Wickens,J P Cumalat,E Auffray,E Daubie,L Kreczko,C Biino,K Shin,G Lungu,T Christiansen,G R Snow,D Ungaro,W A Khan,N Colino,J Fernández Menéndez ,A Toropin,S Costa,Özgür Şahin ,D Volyanskyy,A J Bell,A Moeller,S Bitioukov,W Andrews,G P Di Giovanni,W Lohmann,D Winn,N Terentyev,A De Cosa,I Golutvin,G Mäggi ,T Virdee,A Özpineci ,S Nuzzo,Y F Liu,P T Cox,J M Kohli,P Jarry,L Fields ,S Popescu,N J Hadley,C H Jiang,N Zaganidis,D Martschei,G Nicolas Kaufman,W Lustermann,G M Chen,P D Luckey,E Tuovinen,S Reucroft,L Spiegel,M Özbek,B Curé,Ž Antunović ,T Maënpaä ,A Venturi,B Fabbro,J Anderson,S Xie,L Benussi,C M Kuo,R A Ofierzynski,A Singovsky,P Schlein,H Liu,I Vila,S Tavernier,E Migliore,M Górski,J Hirschauer,D P Eartly,M Kaya,J Marrouche,M C Sawley ,E James,S Gascon,W Hintz,G Ball,A Gurtu,S Abdullin,V E Bazterra,M Kazana,A T Laasanen,P Katsas,A Zarubin,C Milstène,J R Vlimant,G Grégoire,T Y Ling,J Merz,T Tuuva,A Lopez Virto,M Aguilar-Benı́tez ,V Innocente,H Prosper,H Pieta,N Heracleous,B A Barnett,A H Ball,E Marinova,D Dutta,R Gonzalez Suarez,R Lander,G Y Jeng,P Siegrist,I Hoş ,M Abbrescia,R Frazier,T Speer,D Demir,K Höepfner ,T Rovelli,L Foà,M Pesaresi,V Sordini,S Harper,V Litvine,J Fay,C Jorda,O Grachov,V Kaftanov,C Magass,K F Johnson,H Teng,M Cuffiani,A Pfeiffer,B Blumenfeld,L Perera,V Monaco,S Đurić ,D Uzun,C Lundstedt,P Noli,J Seixas,F M Stober,S F Novaes,S Czellár ,L Fiore,M M Obertino,P Merkel,A Avetisyan,P Zotto,W Carvalho,T Kuhr,G Pásżtor ,F Rebassoo,M Zakaria,D Baumgartel,V Kim,Andreas Oehler ,J Goh,D Puigh,M Dubinin,H Geenen,C Jessop,K Kaadze,G Quast,J Speck,I Lazzizzera,O Buchmüller ,G Bruno,F J Ronga,J Hollar,S A Schmitz,Y J Lei,H Flächer ,J S Werner,G Dirkes,S Colafranceschi,G Walzel,S Argirò ,G Bencze,N Sönmez ,O González López ,J Efron,A Kubik,N Pozzobon,I Villella,A Sznajder,T Caebergs,R Marco,J E Cole,C Genta,M Gallinaro,Z Kim,V Ciulli,G Hall,K Lannon,F Nessi‐Tedaldi ,V Hagopian,S De Visscher,D Horváth ,B Klein,A Sparrow,R López-Fernández ,В Сулимов ,L M Villaseñor-Cendejas,U Nauenberg,O Militaru,S Stoynev,A Sabellek,P Everaerts,C Hajdú ,S Gninenko,F R Cavallo,S Lowette,K Gunthoti,S Qazi,M Kadastik,D Krofcheck,J R Patterson,J Richman,S Gennai,O Kaya,E Carrera Jarrin,D Ferenček ,B C Radburn-Smith,G Karapostoli,T Maes,N Sen,A Askew,M Lebourgeois,V Mossolov,I J Cabrillo,M Chadwick,C Rovelli,D R Claes,H B Newman,R K Choudhury,A Morelos Pineda,F J M Geurts,J Lykken,R Wallny,I Katkov,P Raics,A K Mohanty,D Maletić ,C Loizides,M Pelliccioni,D H Moon,O Kodolova,Р Тенчини ,A Nowack,J Descamps,S Costantini,A Ferrando,P Vanlaer,F Fabbri,M Balazs,Y S Chung,F Cossutti,J C Yun,P Avery,L Martini,V Veszprémi ,H S Chen,H Schettler,S V Rusakov,G Sguazzoni,A Nart,D Strom,Y Kim,A Aranyi,P Lobelle Pardo,J Fulcher,L Litov,H Enderle,B Kilminster,D Sillou,V Valuev,A.-M Magnan,M Searle,P Allfrey,R Paramatti,M E Dinardo,A Heister,V M Ghete,U E Surat,K H Chen,P Nef,K Mazumdar,K Nawrocki,L Malgeri,K Rose,Z Wan,J Haupt,J Klem,G Cirino,G Iaselli,J Swain,C K Mackay,V O’Dell,K S Grogg,R Stone,A Lanaro,K Rabbertz,P Sonnek,Biao Zhu ,A Gribushin,N Akchurin,M Déjardin ,M Zeyrek,P Bartalini,L Millischer,M Feindt,D A Sanders,E Alagöz ,G Flügge,U Baur,S Blyweert,M Cutajar,S Esen,L Demortier,J Duarte Campderros,P Klabbers,R Rossin,M Mohammadi Najafabadi ,D Blöch ,T Rodrigo,C Charlot,L Mucibello,A Perrotta,T Frueboes,A Pashenkov,J Weng,E De La Cruz Burelo,R G Kellogg,S Banerjee,G Kozlov,P Musella,D Wood,K Kaschube,В Качанов ,J Eugster,O Bondu,E M Da Costa,P Giacomelli,A Sharma,A Attikis,P E Marage,A Castro,Z Chen,W H Smith,M Renz,A Palma,W Dominik,R Bainbridge,R Vasquez Sierra,S Taroni,A Taurok,J W Gary,P Azzurri,M Demarteau,W Kiesenhofer,P Ronchese,W Johns,M Margoni,P Papacz,L Agostino,G Vesztergombi,J Asaadi,M Chan,D M Raymond,D Spiga,S Won,D Futyan,P Rumerio,A Khan,Y Tschudi,M Aldaya Martin ,C Nicolaou,F Yumiceva,A Ferapontov,D Jang ,M Wang,A Satpathy,K Kadija,J Wagner-Kuhr,D Krpic,V Karjavin,I Dumanoğlu ,C Mesropian,P Govoni,I Chakaberia,M Zeinali,D Loukas,Y Ivanov,A Belyaev,S Kailas,E Nesvold,N Bondar,D Fehling,A M Guler,J Bellinger ,E Norbeck,M Hoch,M Besançon ,S Bianco,M Dželalija ,D Gerbaudo,M Chiorboli,A Dominguez,S W Lin,R Castello,N Manthos,P Killewald,A Elliott-Peisert,M Maity,Y Zheng,P Lenzi,M Giffels,W.-S Hou,S Çerçi ,K H Hoffmann,T Rohe,H Malbouisson,K Yi,S Lee,K Krajczár ,B Clerbaux,V Patras,K Mishra,D Troendle,I Puljak,J Nachtman,V Cuplov,J Callner,M Stoye,I Ahmed,C Dragoiu,C Schäfer,M Della Negra,C Jarvis,S Malvezzi,P Markowitz,M Deniz,K Klein,F Lacroix,M Cepeda,M Krammer,L Pape,I Dremin,D Franci,Sandra S Padula,W Wu,N Neumeister,A Rose,C Botta,J Chung,M Dias ,G Cerminara,R Ruchti,J Thom,M Dyulendarova,S Sumowidagdo,John Michael Marraffino ,M Hohlmann,J St John ,N Parashar,K Arisaka,A Hinzmann,H Sakulin,M E Pol,M Sani,M H.g Souza ,T Geralis,S C Tonwar,J Gruschke,M Pimiä,A Polatöz,M Hansen,L Bianchini,A De Roeck,B Hegner,F A Dias,M Paulini,G Bauer,R Ralich,W Lange,W D Teo,M Jindal,A Campbell,L Mundim,P Verrecchia,J Erö,M Wayne,O Devroede,U Akgun,S Kang,L Guiducci,A F Osório Oliveros ,V Palichik,J Gronberg,K Ranjan,O Pooth,C Amsler,N Hörmann,J H Wu,P Sharp,W Ko,A Fanfani,A Safonov,N Chanon,I M Anghel,T Ferguson,G Landsberg,J Jackson,I Segoni,N Leonardo,R Rusack,S Sekmen,Alberto Sánchez Hernández ,M Merschmeyer,S König,C Hof,J Whitmore,K Sung,D Bonacorsi,Л Дімітров ,R Y Zhu,J Gartner,J G Smith,P R Dudero,S Cittolin,I R Tomalin,B Heyburn,D Eckstein,N V Tran,G Kasieczka,B Pavlov,J Pálinkás ,K Kousouris,M I Asghar,P Silva,Y Kubota,J Cuevas,D Treille,A Ostapchuk,D Barge,R Beuselinck,M Kirsanov,R Khatiwada,A Ershov,A Mohapatra,S Rappoccio,E Butz,M Felcini,P Chang,L Raposo,R Kelley,E Conte,P Sauerland,L Caminada,A Panagiotou,D Cebra,L Levchuk,D Mercier,A Rýd ,M Haguenauer,C Hill,R Ranieri,D Toback,R Sever,S W Lee,H Vogel,C Lourenço,T Medvedeva,Y.-J Lee,A Kraan,P Gras,Y W Chang,A Melo,M Thomas,S Ozturk,D Piparo,K Öcalan ,C Marchica,D J Hofman,S I Cooper,G Roland,F Torres Da Silva De Araujo ,T Aliev,R P Smith,T Mccauley,P Lecoq,C Prescott,Y Yang,M Lethuillier,F Marinho,J Flix,S Somalwar,U Goerlach,J Olzem,I Vankov,S Sanders,A Montanari,D Bortoletto,A Lanev,N Eggert,M Ivova Rikova,J Han,I Mikulec,K Matchev,H Kim,T Sabonis,T Camporesi,S Malik,S J Qian,Kristjan Kannike ,K Freudenreich,V Kozhuharov,M Weinberger,P Baillon,M Cerrada,S Kwan,M Buehler,C Wissing,J De Favereau De Jeneret,G Cappello,S Thomas,J Leonard,S Vanini,J Zhang,I Shreyber,A Kapusi,J Varela,D M Morse,L K Saini,M Murray,S Wakefield,Th Müller,J Królikowski ,N Beliy,A Hunt,X Shi,E Olaiya,J Wetzel,W Bender,A Schmidt,U Berzano,P Bloch,N Rompotis,G De Lentdecker,M Tripathi,A Santoro,S Hänsel,L Perchalla,M Weinberg,R Salerno,D Mason,I González Caballero ,Thomas Schwarz ,H C Kaestli,G Barbagli,D Piccolo,M De Mattia,D Engh,K A Ulmer,A Mestvirishvili,C Hartl,G Mantovani,M H Liu,V Golovtsov,F Ambroglini,T Karaman,L Fanò,P Mane,J H Liu,J Chen,N Cripps,S Liang,N Nishu,D Green,J N Butler,M A Borgia,S Rahatlou,B C Shen,J Yelton,N Valls,A Pompili,B Camanzi,Z Zhang,B Safarzadeh,H Brun,A Vartak,A Kalinowski,L Scodellaro,T Peiffer,V Grishin,P Adžić ,R Clare,D Hidas,J Puzović ,A V Gritsan,C Delaere,H Nguyen,S C Kao,L Wilke,L Uplegger,Y Gotra,A Petrilli,B K Heltsley ,Z Hatherell,M U Mozer,S Song,D Daeuwel,J B Singh,M Jones,D Abbaneo,C Diez Pardos,A P R Gay,A Baden,D Sprenger,D Riley,L Barone,M J Kortelainen,J Alcaraz Maestre,C Fabjan,L Tourtchanovitch,R D’Alessandro,P Traczyk,H Castilla Valdez,B Bylsma,M Jenkins,E A De Wolf,F Pandolfi,L Dudko,S Lynch,M Anderson,D Wang,J Hammer,V Andreev,B Gomez Moreno ,A Parenti,M Schröder,A Colaleo,G Cerizza,Y Weng,G P Heath,H Rykaczewski,P Petkov,Y Mao,M Maggi,A Nikitenko,M Pioppí ,E Barberis,M Bedjidian,R Breedon,M Yan,D Petyt,K Smith,V Chiochia,M Calderón De La Barca Sánchez ,J Dolen,S Tkaczyk,D Montanino,G M Dallavalle,B Huckvale,K Sumorok,S K Kataria,F A Teischinger ,W Clarida,K Cankoçak ,S Piperov,B Marangelli,A Vilela Pereira ,E Casimiro Linares,S Schael,O Oberst,C Autermann,P Shukla,V Miccio,K Maeshima,G Hu,P Meridiani,J P Gomez ,H J Simonis,P Maksimović ,B Ille,J Kolb,C Hackstein,M Choi,P Mcbride,F Chlebana,F Gasparini,L Wehrli,M Tytgat,S Boutle,J Freeman,P Vichoudis,I Papadopoulos,J Maes,M Galanti,S Bhattacharya,G Miní ,C Ferro,D Gigi,G Giurgiu,F Glege,M Herndon,G B Mohanty,K W Bell,R M Brown,M Ata,R Harr,D Colling,L Romero,T Aziz,P Schleper,C Rogan,S H Chuang,S A Tupputi ,T Bose,S S Yu,M Friedl,Andreas Bernhard Meyer ,D Dobur,G S F Stephans,J Robles,S Shrestha,C Newman-Holmes,V Buege,V Epshteyn,F Özok ,S Jabeen,Y Tu,R Pordes,M Karim,M Guchait,S B Beri,S Nahn,P Van Hove,S M Spanier ,T Kypreos,E Widl,H Pi,J Morales,D Heydhausen,N Adam,C Diez Gonzalez,R Dell’Orso,K Kovitanggoon,L Barbone,H Weber,C Mariotti,G Flucke,M Selvaggi,J Tomaszewska,C Paus,T Miao,K Stenson,C Bardak,A Guneratne Bryer,A Ruiz-Jimeno ,F Pauß ,A Cattai,R Godang,N Amapane,Ashok Kumar ,D Barney,M Bontenackels,M Malberti,J G Shiu,K Doroba,A P Singh,S Braibant-Giacomelli,Z J Guo,C Maguire,A Nayak,S Sala,L Muñiz ,L Basso,E Gurpinar,R Wilkinson,T Yetkin,S Dasu,L Sarycheva,J Strauss,K Buńkowski ,P A Razis,G Gomez Ceballos,R Hadjiiska,M Serin,E Brownson,S Semenov,A Çakır ,S Obraztsov,G Abbiendi,M Dittmar,G Davies,S Mrenna,A Biselli,C C Wang,R M Harris,S Bansal,U Heintz,P Torre,R Ryutin,S Marcellini,O Prokofyev,V Pavlunin,J A Coarasa Perez,N Godinović ,P Fabbricatore,J Hays,A Uzunian,L Moroni,A Pozdnyakov,V Petrov,T Kelly,K Piotrzkowski,G Daskalakis,K Klapoetke,D M Newbold,W Behrenhoff,W Van Doninck,I A Cali,E Berry,I Fisk,V Khotilovich,E Boos,J E Kim,S D Worm,F A Triantis,E Castro,P Miné,B Tali,K S Sim,M Zieliński ,M Vazquez Acosta,S Goy Lopez,D Pedrini,N Cartiglia,D Teyssier,J Veverka,R Yohay,K Hatakeyama,W Bertl,Y Kuessel,A Scheurer,A Whitbeck,J Zennamo,C Schwick,B R Drell,K F Chen,M Squires,E W Vaandering,V Matveev,J Y C Tam ,L Antonelli,P Kyberd,T Danielson,U Langenegger,G Mitselmakher,J Steggemann,P Janot,G Kaußen ,A Bean,C Foudas,M Menichelli,G Hanson,M Erdmann,Piero Giorgio Verdini ,A Tsirou,D Lelas,D H Kim,D Carlsmith,G Bagliesi,A Rosowsky,O Gutsche,R Vilar Cortabitarte ,P Gupta,A Kopecký ,S Buontempo,T Cheng ,P Vitulo,K Gabathuler,L Ceard,S Gollapinni,R Schöfbeck,T Kress,J Suarez Gonzalez ,G Rakness,B Stieger,S Mueller,N Schul,M Mulders,J Temple,W Gabella,R Moser,P Lecomte,J Milošević ,P Demin,R K Shivpuri,R Stringer,H Breuker,U Dosselli,L M Pant,R Erbacher,S Shmatov,A Kropivnitskaya,M Duda,N Bacchetta,A Fahim,H Reithler,J F De Trocóniz,N De Filippis,R Remington,W J Spalding,S Metson,H Gerwig,P Sellers,W Li,F Liu,L Cremaldi ,N Darmenov,J Alexander,C Eskew,V Azzolini,Q Ingram,Arda Halu ,R Carroll,P Tropea,J Caudron,James Lamb ,C Martínez Rivero ,M Blume,M Valdata,O Atramentov,M Raidal,P Paolucci,J Goldstein,M Klute,D Pagano,F Drouhin,X Janssen,A Lucaroni,G Boudoul,T Adams,J Bauer,S Stoykova,J Berryhill,N Demaria,Y Gao,F Palla,S Choi,J Gu,A Kyriakis,C Florez,B Bilki,P Juillot,M Voutilainen,A Oulianov,G Steinbrück,M Simon,C Riccardi,S Khalatian,M De Palma,Н Голубев ,I Redondo,V Tancini,E Gülmez,F Stöckli,J A Bakken,F Cavallari,S Albergo,J Conway,Song Guo ,F Hartmann,J Sturdy,A Everett,M Szleper,J Ballin,F Würthwein,S Padhi,R Kinnunen,H Bakhshiansohi,M Müntel,H Arfaei,M Heinrich,C Willmott,A Benaglia,T Miceli,F Ligabue,L Quertenmont,J Y Kim,J E Ramirez Vargas,C Seez,E Longo,D Tsirigkas,J Warchol,R Mankel,B Scurlock,T Khurshid,Z Szillási ,G Eckerlin,A Penzo,Y Sirois,E Meschi,A Deisher,E C Chabert,V Gaultney,F Blekman,M Deliomeroglu,O Koybasi,C H Shepherd‐Themistocleous ,W Białas ,A Bocci,N Wickramage,T J Kim,C Viviani,I Lokhtin,G Mavromanolakis,C Civinini,D Giordano,J.-L Agram,A Giassi,E Yazgan,T Mäki,P Kreuzer,J Malclès ,V Timciuc,S A Koay,J.-C Fontaine,M Bluj,A Rácz ,A Papageorgiou,K Datsko,M Mannelli,W J Womersley,A Drozdetskiy,V D Elvira,J Harvey,M Fernández ,J Olson,Yu Andreev,D D’Enterria,D Silvers,H Xiao,M Konecki,M J Ryan,D Pellett,R Sharma,B Millán Mejías ,V Reković ,G Majumder,T Dorigo,M E Mattson ,Magdalena Djordjevic ,D Kovalskyi,F Nowak,B Hong,I Bloch,P Lariccia,G Sultanov,H Kalakhety,F X Gentit,L Mirabito,A Beretvas,V Krychkine,A Krokhotin,L M Lebolo,R.-S Lu,J Tuominiemi,D J Summers ,L Borrello,M Kasemann,G Mila,S Beauceron,A Hektor,B Klima,A Bornheim,C Fernandez Bedoya,D Reeder,M Zanetti,S Sengupta,G Hamel De Monchenault ,W Busza,K Nirunpong,F Matorras,A Santocchia,Shilpi Jain ,B Gobbo,K Bloom,M A Reyes-Santos,F Fiori,S Mersi,T Chwalek,P E Karchin,P Negri,M Chamizo Llatas,S K Park,P Paganini,E B Ziebarth,P De Barbaro,M Spiropulu,J G Acosta,C Lazaridis,A C Mignerey,A Raspereza,C Plager,F Golf,S Troitsky,W De Boer,D Polic,M Sasseville,A David,T Klimkovich,L S Durkin,G Brona,M S Witherell ,P J Bell ,J Rohlf,A Bodek,J Tucker,N Van Remortel,F Ferri,J Santaolalla,D Hits,N Shumeiko,Ch Thiebaux ,E Locci,D Del Re ,V Dero,M Diemoz,M Chen,P Suggisetti,M Hildreth,G N Kim,L N Vergili,O Charaf,S Frosali,M Jeitler,M Kaur,D Cline,R Gray,M Hollingsworth,V J Smith,F Bostock,L Rebane,R Wolf,J G Bian,C Dozen,T Dahms,F Meier,J Haas,A Bhatti,D Creanza,D Konstantinov,S Özkorucuklu ,A Stahl,J Mnich,M Cardaci,P Iaydjiev,B Akgün ,A Volodko,K Harder,B Alver,S Belforte,Y Mikami,J Smith,M I Josa,K Goulianos,H Rohringer,C Regenfus,B Ujvári ,M D’Alfonso,K Petridis,M Chertok,J Klukas,R Redjimi,R Rougny,B Diamond,C Campagnari,G Anagnostou,L Taylor,F Borcherding,H Park,M Biasini,S Ganjour,I Vodopiyanov,S Kuleshov,J Jones,R Bellan,M Boutemeur,S Ochesanu,S My,S Naumann-Emme,G Önengüt,A Soha,A Triossi,C Markou,M Finger,P Cole,P Garcı́a-Abia ,S Schnetzer,G Petrillo,S Elgammal,H F Heath,W T Chen,D H Miller,R Loveless,T Hebbeker,O Actis,T Kamon,S Klimenko,M H Zoeller,J Sammet,M Arneodo,M Titov,G I Veres,S Das,D Soares,S Chang,Y Roh,G A Pierro,C Broutin,J Mans,T Lomtadze,Michael Henry Schmitt ,M Kirakosyan,G Franzoni,C Mavrommatis,A Calderón ,A O M Iorio,M Gataullin,M Rovere,B W Kennedy,C Sander,T Punz,I Volobouev,R Pleština ,D Boumediene,A Bonato,J Incandela,U Gebbert,T Boccali,J Ott,G P Siroli ,K M Ecklund,P Piroué,S Lehti,M Saelim,M W Arenton,R Musenich,P Bellan,A Thea,I Kravchenko,I Svintradze,P Azzi,R Covarelli,V Brigljević ,M Meschini,K Banzuzi,F Siklér ,B De La Cruz,R Wigmans,J P Chou,J L Faure,V Adler,J G Branson,Y H Chang,J Hanlon,A Sakharov,P Van Mulders,B Kreis,H Kluge,A.s Clough ,A Cabrera,D Benedetti,G Safronov,M Giunta,S Eno ,L Silvestris,J Ziegler,S Baffioni,D Mesa,D Marlow,V Smirnov,A Heikkinen,Y Gershtein,L Teodorescu,A Savin,H Jensen,M Costa,I Manolakos,V Savrin,Matthias Kirsch ,R Frühwirth,M C Fouz,N Ilina,R Kroeger,A Rizzi,A Vinogradov,R Rahmat,R Vidal,M Hashemi,G Schott,C Grab,J Mousa,E García-Solis ,C Battilana,K Theofilatos,G Segneri,V Karimäki,T Le Grand ,P Petrov,A Gresele,F Beaudette,K Kotov,L Vanelderen,J Draeger,R Cavanaugh,R Travaglini,B Caponeri,J Russ,M Davids,B P Padley,V Halyo,C Roland,L Gutay,J J Brooke,R Castaldi,A Knutsson,J Härkönen,Y Ban,E A Albayrak,D Stuart,Y Chào ,A Ledovskoy,C Kleinwort,K Gill,R Trayanov,G Kukartsev,K Rossato,A Anastassov,D Sabes,W Erdmann,E Gottschalk,A Yagil,P Limon,Y Hsiung,C E Gerber,P Biallass,V Oguri,I D Reid,J Zablocki,A F Garfinkel,G Gómez ,A T Serban,S Bose,M Grünewald ,G Debreczeni,D Liko,G Pugliese,M F Carneiro ,L Di Matteo,A Luthra,S Petrushanko,A Sanchez ,B Kim,D Tornier,T Whyntie,S Başeğmez ,M Pierini,T Bergauer,A Nardulli,T Bolton,R Wilken,D Lopes Pegna,A Macpherson,M Sobron Sañudo ,S Bolognesi,M Vergili,Y Fu,A A Ocampo Rios ,S Hagopian,J Swanson,S Linn,A York,A Kharchilava,L Sonnenschein,M Edelhoff,A Lath,A Givernaud,M Zeise,S Lacaprara,A López ,A T Meneguzzo,J M Hernández ,O Sengul,A Starodumov,N Saoulidou,A Jafari,A Tropiano,D J Karmgard,J 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Volpe,G Polese,J Zang,G Masetti,D Orbaker,A Linn,A Tricomi,I C Park,S M Silva Do Amaral ,N Manna,E Tuominen,P Eerola,X Wang,H Jung,D Ryckbosch,E Laird,C Justus,J L Rodriguez,D Bisello,A Korpela,D Wright,A Meyer,D Bourilkov,Y Maravin,P Busson,R D Field,M Grothe,W D Zeuner,S Ward,A Chatterjee,S Conetti,A Tapper,G Selvaggi,M Mateev,M Nikolić ,C K Lae,K Borras,G Gökbulut,D Trocino,J Nash,D Fasanella,D Lange,E Kuznetsova,W Hopkins,A Dimitrov,H B Rhee,L Gray,A Dierlamm,P Martinez Ruiz Del Arbol,R Fereos,I Iashvili,H K Wöhri,A Saha,D J A Cockerill,M Tosi,M Swartz,T Schöerner-Sadenius ,R Lipton,C Palmer,R Klanner,M Mazzucato,S Fonseca De Souza ,J Molnár ,E Sexton-Kennedy,U Behrens,L Gouskos,C Albajar,E Halkiadakis,A Zuranski,D Berry,S R Wagner,E Calvo,I Evangelou,T Tabarelli De Fatis,I Azhgirey,J Hauser,L A T Bauerdick,S Morovic,S Ovyn,D Renker,H Mermerkaya,M Ahmad,H W K Cheung,A Ghezzi,I Yu,L Sala,M Pernicka,A Graziano,M Ignatenko,M Niegel,C De Oliveira Martins ,P Bunin,J Wang,K Burkett,M A 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Zang,S Guragain,G Tonelli,D Evans,R Horisberger,M Johnson,A Gaddi,F Duru,H Stadie,S Sharma,M De Gruttola,S Tourneur,A De Benedetti,D Contardo,K Lassila-Perini,J Rander,M M Baarmand,E M Gregores,J Olsen,E Vlasov,C A Carrillo Montoya ,L Orsini,K V Tsang,V Maroussov,A Kayis Topaksu,J Schwandt,D Lazic,M Goncharov,V E Barnes,N Marinelli,A C Benvenuti,P Zalewski,S W Li,I Diaz Merino,A Besson,C.-E Wulz,J Hauk,P Kalavase,J.-P Merlo,P Luukka,A Hervé,P Checchia,J Keller,Ali O Ayhan ,E Di Marco ,D Kotliński ,E Dusinberre,Humberto Antonio Salazar Ibarguen ,T Kurča ,S P Singh,K Lelas,M Eads,N Pastrone,D Schinzel,Pedro Ribeiro ,E Twedt,W Adam,E Shabalina,T R Fernandez Perez Tomei ,D J Kong,J Lazo-Flores,S Maruyama,A Ivanov,J P Fernández Ramos,J Marco,P Milenović ,C Tuvé ,D Vishnevskiy,D Ćutts ,L Kramer,P Harris,P Kurt,F Fedele,N Tyurin,L Wendland,A Vorobyev,A Smoron,R Gomez-Reino Garrido,A Sill,D Liang,E Torassa,J Bunn,A Massironi,S V Gleyzer,A Martelli,A Adıgüzel ,S Vavilov,F Santanastasio,H Seo,P Kokkas,S Troshin,R Démina ,S Honc,S Bilmiş ,F P Schilling ,M Kirn,P Lawson,A Zatzerklyaniy,A Kalogeropoulos,C Vander Velde,L Lista,R Granier De Cassagnac ,Á László ,S Paktinat Mehdiabadi ,S Erhan,R Nandi,D Cussans,Z Wang,J Frangenheim,J Velkovska,E Petrakou,I K Furic,D Stickland,B Dahmes,P Tan,A Volkov,B Roland,D Martisiute,J Ellison,V Krutelyov,E Yildirim,R Carlin,P Giubilato,R T D’agnolo ,D Denegri,S Ventura,C Leonidopoulos,K Y Kao,Z C Yang,E Cano,M Ataç ,A Snigirev,F Moortgat,Y Musienko,M Z Mehta,M Weber,G Della Ricca ,A Hahn,R Trentadue,C Neu,W Waltenberger,A K Srivastava,D R Wardrope ,D C Miner,Y M Tzeng,H Van Haevermaet,C Baty,M Rodenburg

doi:10.1140/epjc/s10052-010-1453-9

Abstract

A measurement of the underlying activity in scattering processes with transverse momentum scale in the GeV region is performed in proton-proton collisions at sqrt(s) = 0.9 TeV, using data collected by the CMS experiment at the LHC. Charged hadron production is studied with reference to the direction of a leading object, either a charged particle or a set of charged particles forming a jet. Predictions of several QCD-inspired models as implemented in PYTHIA are compared, after full detector simulation, to the data. The models generally predict too little production of charged hadrons with pseudorapidity eta < 2, p_T > 0.5 GeV/c, and azimuthal direction transverse to that of the leading object.

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Journal: The European Physical Journal C	Publication Date: Nov 6, 2010
Citations: 47	License type: cc-by-nc

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R Discovery Prime

First measurement of the underlying event activity at the LHC with $\sqrt{s} = 0.9$ TeV

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First measurement of the underlying event activity at the LHC with $\sqrt{s} = 0.9$ TeV

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More From: The European Physical Journal C