Measurement of the underlying event activity at the LHC with $ \sqrt {s} = 7 $ TeV and comparison with $ \sqrt {s} = 0.9 $ TeV

S Chatrchyan,F Bostock,A Ivanov,K Hatakeyama,M Kadastik,E Petrakou,T Pearson,A Karadzhinova,Y Maravin,R Godang,K F Johnson,S Erhan,T Kypreos,K Sogut,S Won,J G Bian,M Finger,W To,L Mundim,J Hollar,Y Gotra,R K Choudhury,D Stickland,G P Van Onsem,N Schul,O Pooth,H Park,B Heyburn,E Karavakis,M Nespolo,Y Musienko,B Camanzi,A Kubik,S Wimpenny,D Gerbaudo,M Edelhoff,K Stenson,J E Ramirez Vargas,G Broccolo,J Hauk,F Romano,L Mucibello,N Darmenov,A Richards,J Anderson,D Lange,A M Guler,Z Wan,B W Kennedy,S Folgueras,S Costantini,F Marinho,F Drouhin,V Genchev,D M Morse,J Callner,J Rennefeld,T J Mertzimekis,A T Serban,A Dominguez,A M Rossi,C Newman-Holmes,E Kuznetsova,M Tripathi,J Nachtman,Th Müller,M Mannelli,M Z Mehta,J Thomsen,S Slabospitsky,P Meridiani,A Volkov,N Leonardo,L Levchuk,J Butt,P Sauerland,D Wang,J Ribnik,A Lucaroni,B Cox,M Karim,S Gollapinni,Y Tschudi,O Gutsche,I Segoni,A Guneratne Bryer,I Lazzizzera,N Rompotis,M Simon,B A Barnett,T Rommerskirchen,E Daubie,T Adams,J Haas,F Meier,M Goncharov,P Vichoudis,T Kolberg,P Verdier,P Zalewski,R Loveless,N Pacifico,R Eusebi,J Tucker,D Lazic,J St John,C M Kuo,I Redondo,G S F Stephans,A Lanev,M Mazzucato,H Jung,V Karimäki,R Khurana,P Geffert,J Gilmore,M Cutajar,V Gavrilov,L Silvestris,A De Roeck,J A Coarasa Perez,M S Jeong,F Raupach,J Vaughan,S Ahuja,P E Karchin,D Vishnevskiy,A Saha,S R Wagner,L M Pant,P H Butler,A Gurtu,M Duda,F J Munoz Sanchez,C Dozen,J Härkönen,D Heydhausen,D Duggan,B Bilki,P Verrecchia,A Smoron,M Squires,M Schröder,G Dirkes,D Lelas,P Mehta,M Ivova Rikova,P Azzurri,H Breuker,M Pernicka,W Hintz,M Issah,T Danielson,P Mane,P Nef,F Glege,R Jussen,T Punz,I Bloch,S Sala,G Bruno,A Kraan,E Torassa,A Singovsky,D Tornier,R Wolf,R Montalvo,S Hagopian,J Suarez Gonzalez,N Pietsch,S Cihangir,A Ostapchuk,E Dietz-Laursonn,D M Newbold,S Walsh,S Metson,V Matveev,R D Field,N Krasnikov,A Bean,P De Barbaro,W D Zeuner,G Bauer,I Katkov,D Lomidze,S W Li,G Karapostoli,A Heikkinen,S M Silva Do Amaral,M Malberti,A Moeller,W L Prado 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Gu,J E Kim,G Roselli,K Y Kao,M Kirn,S Rogerson,J Hammer,E Friis,A Bocci,M Merschmeyer,U Akgun,C Riccardi,B Stieger,S Belforte,C Calabria,V Popov,H Kluge,R Beuselinck,D Pitzl,D Bisello,K Petridis,G Nicolas Kaufman,D Sabes,G Cappello,J G Branson,L Antonelli,A Chatterjee,M Wayne,J Robles,M Vazquez Acosta,Y Choi,M Hildreth,D R Claes,N Dupont-Sagorin,D Sillou,D Liang,G Walzel,S Albergo,B Wittmer,E Nesvold,J Marrouche,G De Lentdecker,A Ledovskoy,M Hoch,C Wissing,D Kovalskyi,J Jones,S Boutle,J Russ,S Choi,T Christiansen,J Berger,T Yetkin,J Babb,H Xiao,L Perchalla,M R Adams,H S Chen,G Grégoire,A F Garfinkel,U Heintz,N Pozzobon,S Liang,J Draeger,B Betchart,R Wilkinson,P Van Mulders,F Fassi,A S Yoon,N Chanon,J Klukas,J Puerta Pelayo,D Sprenger,R Cousins,D Demir,S Mueller,D Lincoln,M Janulis,A Kropivnitskaya,R Kelley,P Avery,A Meyer,A Vorobyev,P Gras,B Marangelli,J Ellison,Z C Yang,A Godshalk,R Frazier,E Luiggi Lopez,U Berzano,P Otiougova,B Snook,J Olson,F Ptochos,A Heister,D Montanino,F 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Khotilovich,Y Guo,M J Bilinskas,A Korpela,T Miao,P A Razis,V Kozhuharov,C Jarvis,S Lowette,S B Beri,C Viviani,S Stoykova,L Di Matteo,S G Heo,L M Villasenor-Cendejas,S Bobrovskyi,K Sumorok,R M Brown,T Hebbeker,R Schmidt,V Karjavin,Y Bai,M Titov,H Kim,T Schum,G Zumerle,A A Ocampo Rios,A Graziano,A Sparrow,S Nahn,M Özbek,P Klabbers,A Dimitrov,N Colino,B Hegner,P Limon,F Ratnikov,A J Bell,B Dahmes,A Delgado Peris,H Stadie,D Futyan,J A Brochero Cifuentes,M Valdata,V M Ghete,S Gascon,P Sellers,H Teng,C Jeong,H Enderle,I Ahmed,A Honma,D H Moon,M W Arenton,J Leonard,A Colaleo,A Linn,R Gray,C Plager,P Siegrist,S Ganjour,E Yildirim,F Palmonari,A Sznajder,D Sperka,D Krofcheck,J Y Kim,R Moser,V E Bazterra,M Ruspa,S Ochesanu,K Theofilatos,E Twedt,P Schieferdecker,W H Smith,Y Roh,I Belotelov,D Del Re,F Ferri,B Hong,U Dosselli,L Sarycheva,L Brigliadori,M J Ryan,K Kaadze,H Sakulin,A Morelos Pineda,L Pape,P Kalavase,K F Chen,M Ignatenko,Y Mikami,H Vogel,F Chlebana,H Seo,K Nirunpong,S Somalwar,K Lelas,S Elgammal,L Barbone,M Gallinaro,P Verwilligen,E Stiliaris,C Mavrommatis,C H Jiang,J Hauser,A Rose,P Gupta,M Voutilainen,E Sudano,K Kaschube,H D Yoo,N Valls,A Korytov,A Panagiotou,J Maes,Y H Chang,L Orsini,A Staiano,J Han,P Schleper,J Bendavid,J Swanson,C Milstène,A Montanari,D Dutta,G Williams,M Sani,S Padhi,V Maroussov,C Schäfer,L Fanò,L Perrozzi,A Bhatti,D Gigi,S Beauceron,F Fanzago,J Zang,P G Verdini,M Jeitler,S Wasserbaech,K Ranjan,S Tosi,M Searle,A Maurisset,S Sumowidagdo,J Duris,P Bartalini,B Clerbaux,D C Miner,L Tauscher,F X Gentit,E Castro,J Conway,R Gomez-Reino Garrido,A Pin,E Di Marco,D Franci,K Lassila-Perini,S L Zang,V Monaco,B Mura,J Dolen,S R Ro,M Stoye,G M Bilei,C Battilana,S Morovic,M Azarkin,J Mousa,I Lokhtin,L Wehrli,R Granier De Cassagnac,A Hunt,F Primavera,J N Butler,G Tonelli,M Chertok,P Petkov,M Erdmann,G N Kim,C Nägeli,J M Kohli,R.-S Lu,L Perera,E Ntomari,S Wakefield,M Merola,M Hollingsworth,O Grachov,J Gronberg,E A De Wolf,D Sunar Cerci,I Vila,X T Huang,S Oliveros,K Flowers,A David,P Robmann,L K Gibbons,S Panwalkar,C Veelken,G I Veres,Y Eshaq,L Demortier,J.-L Agram,A Aranyi,F Gasparini,M Serin,S Gennai,V E Barnes,C Justus,K Rossato,T Tabarelli De Fatis,K S Sim,A Kamenev,M B Tonjes,D Baumgartel,L M Lebolo,E Olaiya,L Lloret Iglesias,D Acosta,A Perrotta,G Flügge,J Nash,R Ruchti,S C Kao,M Segala,P G Ferreira Parracho,N Zaganidis,G Rakness,O Boeriu,V D Elvira,S Paoletti,Yu Andreev,D Winn,B Kreis,D Loukas,B Alver,A Stahl,B Pollack,Y S Chung,D Bortoletto,M A Mahmoud,J H Kim,P Schlein,D A Sanders,P Jindal,S Tourneur,Y W Chang,F Fabozzi,M Selvaggi,L Basso,L Gauthier,B Gomber,G Merino,C Urscheler,G Ball,O Charaf,D Martschei,H Pi,G J Kunde,D Troendle,G Segneri,A Krokhotin,T R Fernandez Perez Tomei,P Eerola,G M Dallavalle,B Scurlock,D Cline,S Tuo,S Fonseca De Souza,E Butz,A Kapusi,R Frühwirth,T Miceli,J Whitmore,L Agostino,H Silverwood,G Sultanov,Q Ingram,M De Mattia,D Carlsmith,T Lomtadze,N Nishu,C Hackstein,P Raics,T Peiffer,J Zablocki,J Chen,E Sexton-Kennedy,C Boulahouache,M Chamizo Llatas,G Apollinari,Y Onel,M Marone,A Fanfani,H W K Cheung,M Della Negra,C Regenfus,T Khurshid,R Redjimi,M J Kortelainen,J Jackson,L Malgeri,M Swartz,K A Ulmer,G Selvaggi,D Ryckbosch,M Eads,S Cittolin,L S Durkin,B C Macevoy,A Kayis Topaksu,T Rohe,P Lecomte,U Baur,R Doesburg,R Hall-Wilton,E M Da Costa,M Szleper,L Benucci,M Davids,N Mccoll,G Sguazzoni,N Cripps,J Ziegler,J Gruschke,J R Komaragiri,A De Benedetti,L Kreczko,L Guiducci,H Kalakhety,M Dittmar,S Girgis,N Manthos,R Rougny,L Lyons,E Calvo,K S Lee,P Bunin,J Weng,B Dorney,C R Newsom,A Castro,M Heinrich,J Sammet,H Mermerkaya,G Eckerlin,L Masetti,V Perelygin,S Nuzzo,H Gerwig,V Krychkine,J Fay,Sandra S Padula,R Nandi,P Miné,M Kress,W Erdmann,D Teyssier,M Pierini,M S Soares,S Malvezzi,C Favaro,T Rodrigo,M Herndon,R D’Alessandro,E Meschi,A Dermenev,Y Pakhotin,M U Mozer,P Mcbride,H Brun,M Dragicevic,Y Kuessel,S Carrillo Moreno,J Ballin,G Wrochna,J Smith,N Almeida,G Giurgiu,R Rahmat,M Arneodo,D Lopes Pegna,H Malbouisson,J R Patterson,E Auffray,R Magaña Villalba,K Nawrocki,K Gill,R Bellan,W Martin,V Valuev,A Tapper,V Dero,M Lebourgeois,D Mercier,C Lourenço,S Simon,V Epshteyn,L Romero,R Dell’Orso,M Paganoni,M Krämer,I V Akin,H Pieta,Z Zhang,H Held,S P Ratti,A Raspereza,M Rodozov,J Frangenheim,K M Ecklund,H Gamsizkan,M De Palma,M Deliomeroglu,T Boccali,J.-C Fontaine,J Efron,L Lusito,R Y Zhu,S Paktinat Mehdiabadi,P Faccioli,W Bender,M Pesaresi,W Behrenhoff,A Thea,M C Fouz,P Harris,R G Kellogg,V Smirnov,U Langenegger,T Bergauer,G Davies,W Dominik,J De Favereau De Jeneret,G Mantovani,M Bedjidian,L Benussi,Z Hatherell,G B Mohanty,D Engh,J Pivarski,I Heredia-De La Cruz,H Snoek,M Gataullin,G H Hammad,R Gupta,G Bagliesi,S Khalatyan,L Fiore,M Zeyrek,L Vanelderen,S Bose,J Merz,M Jenkins,J Rodrigues Antunes,W Wu,B Mathias,M Hashemi,A Nappi,C Saout,M Khakzad,D Liko,M Klute,B De La Cruz,I Ross,G Iles,N Odell,A Mohammadi,D H Kim,S Mrenna,G Schott,F Borcherding,J J Brooke,A Markina,M E Dinardo,S Semenov,M Kaya,D Krpic,R Musenich,A Ferapontov,P C Bhat,N Ratnikova,K Gunthoti,S A Schmitz,V Tcholakov,A Zuranski,A Rizzi,K S Grogg,R Rossin,M Sasseville,P Van Hove,D Domínguez Vázquez,M A Reyes-Santos,V Adler,R Vilar Cortabitarte,A V Gritsan,J L Faure,R Walsh,I Vodopiyanov,J M Vizan Garcia,R Stone,S Maruyama,S Gowdy,T Whyntie,E C Chabert,I Manolakos,L Sonnenschein,P Lobelle Pardo,A Vilela Pereira,B Bilin,S Chauhan,O Koybasi,C Schwick,J W Gary,K Mishra,F Vazquez Valencia,G Landsberg,P Sharp,A Drozdetskiy,S Thomas,S Salur,V O’Dell,J C Yun,J Haupt,S Braibant-Giacomelli,F Fiori,C Tully,S Blyweert,E B Ziebarth,M Meneghelli,O Kaya,J Rander,D Polic,C Fabjan,G Cerminara,U Gebbert,A Melo,C Mironov,K W Bell,E De La Cruz-Burelo,S Greder,J Hrubec,F De Guio,D Bodin,A T Laasanen,B C Shen,L Bianchini,C Jessop,I Fisk,A Sharma,Y Chen,P Arce,M Deniz,W Lohmann,G Kozlov,G Fedi,C Ceron,R Wilken,M Luk,M Weinberg,J S Wood,S Kailas,N Manna,G Iaselli,B Wysłouch ,P Iaydjiev,E Seo,J Fernández Menéndez ,D Contardo,M Tosi,F R Cavallo,F Rebassoo,Y Iiyama,Z Wang,D Noonan,M Fernández ,C.-E Wulz,D Majumder,K A Hahn,Sa Jain ,I J Cabrillo,M Yang,А Спиридонов ,J Bellinger ,M Sobron Sañudo ,L Borrello,A Gozzelino,D Bourilkov,S Çerçi ,V Murzin,J Bernardini,P Paganini,J Incandela,D Evans,G Zito,A Özpineci ,Andreas Oehler ,S Ovyn,J Letts,L Martini,A Avetisyan,A Ferrando,S Malik,E Gottschalk,L Kramer,Yang Yu ,J M Marraffino,F A Dias,I Yu,A Vinogradov,W Andrews ,Magdalena Djordjevic ,M Meschini,L Quertenmont,M Choi,R Mankel,A Tricomi,A Savin,P Everaerts,T Schöerner-Sadenius ,Sin Kyu Kang ,A Beretvas,J S Werner,A Gaddi,C Laganá ,K Kotov,K Smith,N Varelas,J C Lange ,J G Acosta,V Azzolini,K Maeshima,E M Gregores,A Tatarinov,A Mussgiller,K Öcalan ,V Veeraraghavan,R López-Fernández ,Y Tu,S Baffioni,E Gülmez,M Giffels,C Civinini,J Molnár ,A Biselli,C Hartl,J Zhang,I Kravchenko,K Krajczár ,A Zhokin,A Pashenkov,P Levchenko,J Varela,L Cremaldi ,R Lander,H Schettler,E Focardi,H Van Haevermaet,G Abbiendi,R Cavanaugh,R Erbacher,A López ,N Sönmez ,G Auzinger,N Godinović ,C Brew,A Çakır ,A Toropin,J A Gómez ,D G Cassel ,W Johns,S Lee,F Cavallari,S Costa,S H Chang ,M Zakaria,H Nguyen,A C Benvenuti,R Wallny,N Béni ,J Królikowski ,A Mestvirishvili,J Mans,D Pedrini,M E Pol,V Krutelyov,D Kotliński ,H Reithler,Pedro Ribeiro ,J Hirschauer,V Ciulli,A T Meneguzzo,P Lariccia,C Oʼbrien ,A Adıgüzel ,A Khan,K Mazumdar,N Cavallo,I Puljak,M Bóna ,A Giassi,D Jang ,E Tuovinen,M Costa,H Méndez ,P Markowitz,N Sen,Y J Lu,P Capiluppi,E Longo,D M Raymond,E Clément ,M D’Alfonso,K Höepfner ,J Mccartin,C Ferro,F Pandolfi,D Bonacorsi,L Felď ,H Saka,W Adam,F A Teischinger ,C Collard,P Spagnolo,A M Sirunyan,D Horváth ,C Botta,C Leonidopoulos,A Sanchez ,A Venturi,S Taroni,K Klapoetke,S Sanders,S Eno ,D Ralph,F Ligabue,R Patel,M Cuffiani,M Perfilov,A Gurrola,S M Etesami,G Gökbulut ,M Pioppí ,A Zabi,O Hindrichs,Arun Kumar ,T Virdee,A Vartak,O Buchmüller ,E Halkiadakis,G Rolandi,R Wigmans,T Aziz,O Long ,D Klingebiel,S Argirò ,M Lethuillier,J Goh,S V Rusakov,P R Hobson,N Mohr,J Goldstein,V Lemaı̂tre ,J Pálinkás ,W J Spalding,C Nicolaou,K Matchev,U Gasparini,G Mila,C Seez,A Pfeiffer,S Senkin,S Bansal,K Buńkowski ,R Hirosky,R P Kenny ,N Shumeiko,P Ronchese,F Stöckli,D Marlow,O González López ,B Bylsma,C E Gerber,M Déjardin ,G Önengüt ,S Colafranceschi,V Kim,R Kinnunen,L Tourtchanovitch,K Kovitanggoon,R Chierici,M Mooney,D Trocino,J P Cumalat,J Lee,J Zabel,R T D’Agnolo,В Качанов ,A Massironi,A Hektor,Yongsheng Gao ,D Denegri,B Frisch,S C Tonwar,T Chwalek,Z L Trócsányi ,M Bluj,M Friedl,F Giordano,V Dutta,M Chadwick,C Florez,F Meijers,Y Ivanov,E Kwon,S Başeğmez ,A Hervé,P Merkel,A Nikitenko,Y J Lee ,A Svyatkovskiy,X Janssen,G Hamel De Monchenault,P Garcı́a-Abia ,R Covarelli,L K Saini,W Flanagan,W Carvalho,S Song,A Rýd ,P Luukka,J Thom,F Romeo,A Rosowsky,A Penzo,G Y Jeng,Y Sirois,M Felcini,A P Singh,K Rabbertz,G P Heath,A Knutsson,S Nourbakhsh,Biao Zhu ,S Shrestha,C Rovelli,P Wittich,P G Mercadante,J.-P Merlo,N Tyurin,I Volobouev,S Vavilov,D Blöch ,D Piparo,V Kumar,H F Heath,G P Siroli ,B Roland,M Dželalija ,Z K Liu,M Paulini,A García-Bellido ,P E Marage,P Govoni,M S Kim,L Muñiz ,G Bolla,L Apanasevich,A Fahim,S Linn,S Jabeen,P Vanlaer,A Barker,A Uzunian,Hans Hoffmann ,P Depasse,P Baillon,D Ferenček ,E Locci,M Ahmad,Y F Liu,P Traczyk,R Breedon,A Kopecký ,A Polatöz ,K Kadija,M Aguilar-Benı́tez ,F Blekman,C Biino,A Y Rodríguez-Marrero,Y Assran,P Baringer,D Eckstein,D Hits,S Lynch,A Benaglia,U Joshi,T Aliev,U Goerlach,S Sharma,I Dremin,D Abbaneo,L Taylor,S Ragazzi,G Petrillo,K Romanowska-Rybinska,B Blumenfeld,J Andreä ,Н Голубев ,A Cimmino,Y Ma,K Sung,A Rácz ,S Kwan,C Dragoiu,F Nowak,S Dutta,D Fehling,J Y C Tam ,K Burkett,B K Heltsley ,S Troitsky,Y Kubota,A F Osório Oliveros ,V Brigljević ,M Górski,J Marco,S Harper,G Gómez ,S Singh ,G Organtini,C Liu,R Lipton,P Musella,C Park,G Martı́nez ,S Bilmiş ,F Özok ,S I Cooper,M Renz,Zero Kim,D Wright,M Abbrescia,A Skuja,F Matorras,M Gouzevitch,P Milenović ,P Adžić ,G Kaußen ,S Bianco,A Volodko,M Galanti,R Ciesielski,G Pugliese,E Alagöz ,B Ille,L Uplegger,R Castello,A Santocchia,J Tao,N Saoulidou,Y Kim,C Maguire,A Taurok,M Kirakosyan,S Kunori,D Wood,M Musich,A Yagil,G Mitselmakher,J Liao,G Hall,H B Rhee,R Yohay,W E Cooper ,S Sekmen,S Spanier,K Shin,M Calderón De La Barca Sánchez ,E Conte,C Roland,T Lindén,A Calderón ,Z Szillási ,J Harvey,Ž Antunović ,A Gribushin,A Solano,J S Keller ,P Vitulo,A Sakharov,L Benhabib,D Green,M Grünewald ,C H Shepherd-Themistocleous,H Castilla‐Valdez ,S Sarkar,S Gninenko,K Doroba,D Stuart,V Sordini,K T Flood ,D R Wardrope ,P Checchia,A Elliott-Peisert,M E Mattson ,S Rappoccio,B Ujvári ,G Benelli,F Nessi‐Tedaldi ,V Andreev,W Lustermann,N Hörmann,J Damgov,T Cheng ,M Grimes,A Starodumov,X Quan,G Masetti,F P Schilling ,M N Bakirci,J Hegeman,I González Caballero ,Edgar Casimiro Linares ,J P Chou,Z Chen,I Chakaberia,D J Karmgard,Z Hu,S Hamdan,J Strauss,D Piccolo,G Dissertori,D Reeder,T Ferguson,V Veszprémi ,O Prokofyev,C Grab,Anuj Chandra ,V Sola,M Jo,C Kleinwort,A Jafari,D Treille,F J M Geurts,G Hanson,S Khalil,R M Harris,I A Cali,S Abdullin,J Milošević ,P Jarry,C Mariotti,A Schmidt,V Innocente,C Albajar,V Reković ,D Colling,G A Alves,G Flucke,K Rose,C Prescott,R Pordes,G Quast,В Жуков ,E Aguiló ,A C Mignerey,J E Cole,M Nikolić ,P Lamichhane,V Zhukova,L Winstrom,G Steinbrück,C Martínez Rivero ,G Safronov,T Frueboes,E Boos,A Gilbert,Humberto Antonio Salazar Ibarguen ,P Kreuzer,S Ozturk,J Caudron,A Gaz,N Adam,J Bunn,P Maksimović ,M M Baarmand,H Rohringer,M Krammer,L Dobrzyński ,M Snowball,T Sinthuprasith,T Medvedeva,C Bernet,I Dumanoğlu ,W Lange,G Majumder,F Lacroix,J Tuominiemi,Thomas Schwarz ,R Paramatti,M Dubinin,R Bainbridge,M Cerrada,Seodong Shin ,G Daskalakis,S A Tupputi ,E Migliore,A Dierlamm,M Margoni,F Palla,M Zanetti,J Steggemann,F J Ronga,A H Ball,A K Mohanty,C Tuvé ,J D’Hondt,V Sharma,Р Тенчини ,A Zarubin,D Giordano,A Kharchilava,S Troshin,S Perriès ,M Narain,F Beaudette,R Pleština ,Α Μάρκου ,W D Teo,P Wagner,S F Novaes,A Cabrera,O Bondu,L Litov,W Gabella,H Nogima,S Bitioukov,M Pelliccioni,W Sun,I K Furic,W.-S Hou,J Rohlf,T Kurča ,N Eggert,E Vlasov,G Mäggi ,P Zotto,A Ershov,P Papacz,A Safonov,M Hohlmann,M Kaur,R Hadjiiska,J Wetzel,J Richman,D Pellett,M Rodenburg,A.-M Magnan,R Sever,G Polese,F Santanastasio,I Osipenkov,T Rovelli,S Đurić ,F Moortgat,W Białas ,N Beliy,N Demaria,P Hebda,C Hajdú ,K Harder,S W Lee,A Holzner,Yajun Mao ,B P Padley,P Hidas,V Savrin,C Delaere,V Palichik,D Silvers,Hannsjoerg Artur Weber ,R Démina ,R Carlin,M C Sawley ,S Das,S Gonzi,B Işıldak ,B Kim,O Devroede,M Biasini,I R Tomalin,D Petyt,A Lath,A Branca,D Mekterović ,D Menasce,J Santaolalla,R Horisberger,J Eugster,D Fasanella,C Ochando,O Kodolova,I Evangelou,M Ćwiok ,G Petrucciani,G Brona,V Kaftanovy ,L Dudko,B Diamond,G M Chen,M Zieliński ,I Hoş ,P Silva,K Borras,D De Jesus Damião ,D Berry,J Sánchez ,N Heracleous,J Hanlon,F Fabbri,R Rusack,T Dahms,J Mnich,M Ataç ,M Raidal,L Barone,S Marcellini,A Lopez Virto,D Ćutts ,G Vesztergombi,M Anderson,J Malclès ,T Ma,C Sander,F Thyssen,P Lecoq,E Pérez ,W Lin,T Tuuva,F A Triantis,M Grassi,M Weber,P Rumerio,H Jensen,T Bose,B Akgün ,F Pauß ,M Kasemann,J Yoo,D Strom,N Dhingra,A.-C Le Bihan,J H Wu,L Teodorescu,A Bethani,G Codispoti,A De Cosa,G Roland,Eric Wayne Vaandering ,E Eşkut ,T Camporesi,R Remington,C Palmer,C J Edelmaier,A Whitbeck,M Souza ,F Golf,J Sturdy,M I Josa,T Maënpaä ,F Würthwein,M S Rudolph ,D J Summers ,A Marinov,A Brinkerhoff,A Nayak,H Flächer ,M Makouski,S Guo,F Siklér ,I D Reid,Maxwell T Hansen ,J B Singh ,A O M Iorio,J Thompson,H Bakhshiansohi,F Cossutti,E Gallo,L Lista,L Moroni,J Veverka,H R Hoorani,W Clarida,J Olsen,J M Hernández ,D D’Enterria,W A Khan,M Schmitt,R Salerno,P Juillot,C S Hill ,A Luthra,D H Miller,P Kurt,P Bortignon,C Y Lin ,K Kousouris,N V Tran,P T Cox,S Özkorucuklu ,W Funk,M Besançon ,C Grandi,Y Chào ,J Bauer,J Alexander,P Lawson,J Erö,V Mossolov,G Bencze,A Tropiano,A Hinzmann,G Ryu,G Franzoni,L A T Bauerdick,O Militaru,A Pozdnyakov,L Foà,J Berryhill,N Neumeister,F L Navarria,I Golutvin,A Sobol,C A Bernardes,C Paus,S Mersi,J Freeman,P D Luckey,A Geiser,J P Gomez ,A Mohapatra,P Katsas,M Grothe,B Safarzadeh,V Golovtsov,J W Smith ,D Konstantinov,M Spiropulu,Karl-Heinz Hoffmann ,S K Nam,A Pompili,B Hooberman,A Askew,K Yi,K Deiters,C Jorda,M Maes,S Buontempo,K Bloom,A Ghezzi,A Apresyan,M Tadel,Ch Thiebaux ,D Barge,P Moisenz,N Beaupère ,L Boldizsár ,P Kokkas,M Thomas,P R Dudero,В Сулимов ,J Königsberg ,A Tumasyan,H B Newman ,S Czellár ,C Willmott,B Mangano,F Yang,D Hartley,D J Hofman,R Sacchi,L Thomas,S Dasu,J Lazo-Flores,G B Cerati,N Pastrone,G Boudoul,P Elmer,M M Obertino,I P J Shipsey

doi:10.1007/jhep09(2011)109

Abstract

A measurement of the underlying activity in scattering processes with a hard scale in the several GeV region is performed in proton-proton collisions at sqrt(s) = 0.9 and 7 TeV, using data collected by the CMS experiment at the LHC. The production of charged particles with pseudorapidity |eta| < 2 and transverse momentum pT > 0.5 GeV/c is studied in the azimuthal region transverse to that of the leading set of charged particles forming a track-jet. A significant growth of the average multiplicity and scalar-pT sum of the particles in the transverse region is observed with increasing pT of the leading track-jet, followed by a much slower rise above a few GeV/c. For track-jet pT larger than a few GeV/c, the activity in the transverse region is approximately doubled with a centre-of-mass energy increase from 0.9 to 7 TeV. Predictions of several QCD-inspired models as implemented in PYTHIA are compared to the data.

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Journal: Journal of High Energy Physics	Publication Date: Sep 1, 2011
Citations: 109	License type: CC BY-NC 2.0

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R Discovery Prime

Measurement of the underlying event activity at the LHC with $ \sqrt {s} = 7 $ TeV and comparison with $ \sqrt {s} = 0.9 $ TeV

Abstract

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R Discovery Prime

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Measurement of the underlying event activity at the LHC with $ \sqrt {s} = 7 $ TeV and comparison with $ \sqrt {s} = 0.9 $ TeV

Abstract

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More From: Journal of High Energy Physics