Forward energy flow, central charged-particle multiplicities, and pseudorapidity gaps in W and Z boson events from pp collisions at $\sqrt{s}= 7$ TeV

S Chatrchyan,C Milstène,T Whyntie,R Gokieli,I Segoni,J Gartner,W Andrews,J Weng,D Benedetti,C Boulahouache,L Lusito,A De Cosa,B Curé,N Van Remortel,J A Gomez,G M Bilei,D Mercier,A Maurisset,S Bolognesi,G Walzel,C Silvestre,S Cihangir,M Hashemi,D Orbaker,A Scheurer,D Franci,K Rossato,D Tornier,A Zatserklyaniy,S Gollapinni,U Gebbert,L Demortier,J Vaughan,Z Wan,P Van Mulders,S D Worm,S Liang,Y Bai,A Deisher,W De Boer,N Almeida,J Slaunwhite,Y Choi,M Mateev,Th Müller,E M Da Costa,P Van Mechelen,M Hoch,D Martschei,P Killewald,M Xu,V Patras,L Wendland,V Maroussov,G Hu,D Sprenger,H Enderle,R Remington,T J Mertzimekis,R Frühwirth,K Y Kao,S J Qian,C Marchica,M Kirn,S Tourneur,S Bobrovskyi,D Martisiute,S Guragain,R Musenich,M Gataullin,A Raval,R Godang,P Baesso,C Broutin,D Dammann,H Park,L Barbone,A Korablev,M Segala,M Polujanskas,R K Shivpuri,I V Akin,P Chang,K Goulianos,S Metson,D Krpic,B C Shen,C Mavrommatis,K Gabathuler,G Cirino,Y Ban,L S Durkin,K Henriksson,A David,B Camanzi,J Gu,U E Surat,M Meneghelli,R Loveless,L Agostino,J Conway,E W Vaandering,J Pivarski,J Ziegler,M Mazzucato,E Widl,M Giunta,V Oguri,A Gurtu,S Frosali,T Mäki,A Lucaroni,S Reucroft,T Yetkin,J Chung,W Van Doninck,G Della Ricca,J Ellison,C Plager,M Kress,K Kaschube,P Tropea,M De Mattia,W Bertl,G M Dallavalle,H Gerwig,V Halyo,M Stein,E Nesvold,T Geralis,M Duda,G N Kim,S Costantini,B Marangelli,A Rizzi,F X Gentit,J Chasserat,C Viviani,M De Palma,M Luk,H Xiao,P Bartalini,F Bostock,P Otiougova,L Tauscher,J Ribnik,K Arisaka,C Loizides,M De Gruttola,A Bornheim,C Eskew,M Karim,B C Macevoy,S Afanasiev,T Caebergs,J Anderson,T Miceli,P Torre,R Gray,E Daubie,N K Mondal,M I Asghar,T Le Grand,E A De Wolf,E Brownson,N Mohr,R Rahmat,M Barrett,K Nirunpong,S Wakefield,R Cousins,C Saout,L M Villasenor-Cendejas,A Bodek,C Lazaridis,V Gaultney,M Kossov,B Scurlock,M Zeise,R Moser,S Blyweert,R Trentadue,Zero J Kim,L Millischer,H Pieta,J G Smith,T Maes,M Hollingsworth,J Marrouche,I Svintradze,M Cutajar,O Koybasi,S Vanini,Q Ingram,Y Tschudi,V Grishin,U Nauenberg,N Manna,S Sala,K Banzuzi,H Kluge,A Potenza,A Melo,E Sudano,B W Kennedy,S Goadhouse,I Manolakos,J Draeger,G B Mohanty,F Odorici,G Grégoire,P Limon,C Hackstein,T Y Ling,R Kroeger,M Rosin,A Nappi,L Kreczko,D Winn,J Callner,N De Filippis,V Khotilovich,P Siegrist,L Masetti,J M Kohli,N Darmenov,M Bedjidian,M Chan,B Hegner,H Teng,E A Albayrak,A M Rossi,C Baty,S Semenov,G Dirkes,L Rebane,H Gamsizkan,R Trayanov,M Jones,S L Zang,D A Sanders,J Whitmore,P Arce,A Sparrow,E Di Marco,H S Chen,E Castro,W Behrenhoff,A Korpela,I Villella,E Mccliment,D Montanino,D C Miner,A Markina,V Adler,L Wehrli,K F Chen,C Trauner,J Hays,R Beuselinck,E B Ziebarth,J Tomaszewska,M Guchait,R Vidal,M Searle,T Weiler,P Bloch,S Esen,S Won,S Khalatyan,T Klimkovich,S Mueller,V Genchev,R Stringer,T Miao,Yu Andreev,P Nef,W Hintz,L Perchalla,T Kress,A Krokhotin,P Verdier,J Sibille,S Schael,T Christiansen,M Deliomeroglu,G Williams,S Khalid,J G Branson,M Feindt,F Liu,A Anastassov,M Heinrich,L Romero,A Rose,R A Ofierzynski,N Zaganidis,I Lazzizzera,N Ratnikova,M Jindal,D Engh,S Petrushanko,G Bauer,P Vichoudis,A Kapusi,E Salvati,S Kailas,A Drozdetskiy,M Della Negra,M Pernicka,R Frazier,I Belotelov,B Caponeri,J Zang,S Rogerson,M Merola,A Singovsky,A Everett,M Valdata,C Markou,K S Lee,B R Drell,K Sudhakar,M Pimiä,D Bodin,R Doesburg,A M Guler,W Parker,S Lacaprara,Y H Chang,C Wissing,C Jarvis,G Giurgiu,J Robles,C K Lae,K S Grogg,H Topakli,A Hunt,J G Shiu,F Gasparini,M Davids,K A Ulmer,C Neu,M J Bilinskas,J Haupt,S R Ro,K W Bell,M Balazs,T Sabonis,V E Bazterra,A Karjalainen,D Polic,K Sogut,M Eads,S Bhattacharya,L Sala,G P Van Onsem,G Kozlov,F M Stober,B Heyburn,G Roselli,T Speer,M C Fouz,C Magass,D Lazic,S Greder,A York,R Wilkinson,M Janulis,P Verrecchia,H Seo,A Heikkinen,K Lelas,P Van Hove,S Y Jun,T Rommerskirchen,Y Mikami,R Schmidt,P Jindal,P Goldenzweig,U Baur,T Son,S Di Guida,H Silverwood,A F Barfuss,A Petrukhin,H Arfaei,Y J Lei,G Schott,J Thomsen,H El Mamouni,S A Schmitz,S Qazi,R Ranieri,A Linn,F Marinho,M Deniz,L M Lebolo,D Lanske,A Meyer,G Segneri,S De Visscher,M A Mahmoud,P E Karchin,G Merino,R D Field,M Bontenackels,M R Adams,A De Roeck,U Berzano,I Shreyber,I Vodopiyanov,V Kozhuharov,R Kelley,J F De Trocóniz,J Sammet,D Heydhausen,J C Yun,L Perera,M Weinberger,M Özbek,J W Gary,V Chetluru,P Fabbricatore,R Jussen,P Bellan,Y Gotra,W Reece,W Martin,P Sauerland,T Kuhr,J Lellouch,J A Bakken,V Pavlunin,J Klukas,S H Chuang,J C Sanabria,A S Yoon,J Gruschke,A Papageorgiou,S Honc,J Olzem,X T Huang,D Sillou,V Dero,S Hänsel,M Bergholz,C Nägeli,M Jenkins,A Bhatti,V Monaco,R Carroll,Y Fu,G Lungu,D Ungaro,G Georgiou,F Simonetto,F Romano,J Swanson,J Efron,M Issah,D Uzun,J.-C Fontaine,W Dominik,A Richards,E Friis,W T Ford,D J Kong,Y S Chung,K Freudenreich,M Serin,T Kypreos,P De Barbaro,O Oberst,J Babb,M Boutemeur,P Petrov,M Saelim,R M Brown,N Pacifico,M A Shah,S G Heo,C R Newsom,I M Anghel,J Zablocki,P Cushman,A T Laasanen,M A Reyes-Santos,A Aranyi,L Di Matteo,M Haguenauer,T Punz,S Walsh,S Tkaczyk,F Palmonari,D Vishnevskiy,B Zhu,B Rutherford,C Jeong,A J Bell,T Schum,P Mehta,X Wan,C Bardak,C Barth,C Urscheler,B Mathias,W Kiesenhofer,E Twedt,V Petrov,H Van Haevermaet,B Klein,M J Ryan,Z Hatherell,L N Vergili,P Sharp,S C Kao,R Wilken,D Liang,M Naimuddin,B Alver,K S Sim,B A Barnett,R K Choudhury,P Sellers,H Held,S P Shipkowski,P Gras,J Temple,J Lykken,R Nandi,D Del Re,D Toback,G Cerizza,S König,H Pi,L K Gibbons,Z J Guo,A Flossdorf,A Baden,I Grigelionis,S Banerjee,M Sasseville,A Smoron,E Norbeck,L Brigliadori,C Mesropian,D P Eartly,A De Benedetti,H Hesari,V Tcholakov,B Fabbro,F Nowak,T S Anjos,Y Guo,P Kalavase,R G Kellogg,G De Lentdecker,V Buege,J Duris,T Danielson,B Tali,M Marienfeld,P Schieferdecker,A Vorobyev,G P Di Giovanni,S Sengupta,L Mucibello,P Kyberd,G Kukartsev,M Müntel,J Rennefeld,F De Guio,M Niegel,P Mane,P Miné,J Gronberg,V Timciuc,K V Tsang,B Mura,R Volpe,O Atramentov,P Everaerts,F Lacroix,E Conte,Y Sirois,J Merz,V Perelygin,E Laird,G Zumerle,O González López ,S Thomas,R Chierici,T Chwalek,J Andreä ,L Dobrzyński ,M Albrow,J A Coughlan,D Gelé,S Buontempo,S Taroni,F Rebassoo,P A Razis,O Pooth,C Dragoiu,S Malhotra,V Kumar,M Ignatenko,G Tonelli,J E Ramirez Vargas ,J Bauer,B Frisch,S Lee,S Hagopian,V Smirnov,D J Hofman,G Dissertori,M Musich,G S F Stephans,D Denegri,W Li,C Foudas,S Başeğmez ,J Dolen,S Carrillo Moreno ,M Pioppí ,A Nayak,S Dugad,P Merkel,V D Elvira,A Kalogeropoulos,A Heister,C Silkworth,C West,A C Mignerey,R Arcidiacono,S Shrestha,B Kreis,J.-M Brom,H Breuker,M Szleper,S W Lee,F Chlebana,R Dell’Orso,M Dubinin,A Raspereza,A Hervé,M S Rudolph ,Pedro Ribeiro ,A Vilela Pereira ,N Béni ,A Polatöz ,M Z Mehta,M Pelliccioni,A Thea,R Salerno,A O M Iorio,O Devroede,C Jessop,G Safronov,P Luukka,S Tosi,J Hammer,G Gómez ,C Florez,J Santaolalla,G Apollinari,Y Yilmaz,A Askew,E Halkiadakis,N Parashar,J Berger,S Dutta,C Lourenço,J Bochenek,D Konstantinov,E Butz,C Calabria,C Seez,P C Bhat,C Oʼbrien ,M Kaur,E Schlieckau,Chia‐Ming Kuo ,J Alcaraz Maestre ,B Pollack,V Golovtsov,Z Chen,J M Hernández ,M Mulders,G H Hammad,S Goldberg,C.-E Wulz,S Nuzzo,Y Iiyama,C Albajar,Н Голубев ,S Girgis,T Hreus,G Breto,T Schwarz,C Rovelli,A Cabrera,D H Kim,D Barney,M Khakzad,B Hooberman,F Drouhin,D Lelas,G Iaselli,I Ross,M Chadwick,D Hits,A García-Bellido ,E Pérez ,D Duggan,N Bacchetta,A Solano,W.-S Hou,J Hanlon,P Maksimović ,D Troendle,D Ferenček ,M Tytgat,E Aguiló ,N Cavallo,G Boudoul,Andreas Oehler ,O Gutsche,R Wallny,J Seixas,E Karavakis,J Duarte Campderros ,S Özkorucuklu ,D Dobur,I Papadopoulos,J Varela,G Gomez Ceballos ,P G Verdini,A Zabi,A Bonato,L Mirabito,S Panwalkar,A Honma,M Gallinaro,P Kreuzer,I Dumanoğlu ,M Klute,A Sobol,J Königsberg ,S Kwan,S Bansal,L Malgeri,A Tropiano,O Charaf,R Mankel,G Hamel De Monchenault ,V Mossolov,M Weber,D Ryckbosch,Y Maravin,G Franzoni,A Saha,P Schlein,L Fanò,J Mnich,A Ershov,J P Chou,J Suarez Gonzalez ,G Rakness,M Sigamani,R Horisberger,A Zuranski,D Fasanella,M M Obertino,S Sanders,J Leonard,C Vuosalo,Yongsheng Gao ,S Das,S C Tonwar,D Dutta,A Cimmino,S Paktinat Mehdiabadi ,F Pandolfi,B Clerbaux,M Menichelli,E Gottschalk,Eric Christian Chabert ,R Montalvo,D Lange,B Klima,K Nawrocki,A Yagil,I Redondo,S Beauceron,A Dominguez,A Dierlamm,D M Newbold,I Dremin,R Redjimi,C J Edelmaier,M Spiropulu,S Salur,J Milošević ,S Senkin,R Khurana,W L Aldá Júnior ,P E Marage,C Leonidopoulos,A Lanev,Α Μάρκου ,M Nikolić ,C Johnston,P Bargassa,W Lohmann,V Khachatryan,B Francis,M H Ansari,G Cappello,Z Zhang,I Chakaberia,K Piotrzkowski,M Maity,M Friedl,H Vogel,A Santoro,P Lecoq,M Vazquez Acosta ,P Papacz,L Felď ,B E Cox ,S Gascon,S Rahatlou,N Odell,M Kirsanov,I Bloch,Y Kim,P Verwilligen,E Longo,C Grab,S Mrenna,F Blekman,P Shukla,F Matorras,C Campagnari,G Y Jeng,S Goy Lopez ,B Betchart,S Park,S M Etesami,G Daskalakis,G Fedi,A Tricomi,D Eckstein,K Smith,D Pagano,S Argirò ,D Silvers,P Iaydjiev,R Yohay,D Krofcheck,F J Ronga,S Wimpenny,A Ledovskoy,R Sacchi,M Wayne,Song Guo 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Rodríguez-Marrero,U Gasparini,H W K Cheung,M Titov,C Rogan,P Jarry,K Matchev,C Battilana,G Bencze,F Glege,N Colino,A Volodko,R Kinnunen,S Belforte,W Haj Ahmad ,P Bunin,S Bose,B Bylsma,J S Wood,S Xie,S Çerçi ,P Baillon,E Clément ,J J Brooke,P Moisenz,A Knutsson,W Adam,M Chertok,Y Kuessel,P Elmer,B Mangano,T Orimoto,C Maguire,D Contardo,N Redaelli,A Perrotta,M Dittmar,R Lipton,L Teodorescu,V E Barnes,N Cripps,F Meier,A Sznajder,K Kousouris,M Shoaib,R Rusack,L Sarycheva,X Wang,M Górski,D A Belknap ,L Moroni,A Avetisyan,A Biselli,K Burkett,J Velkovska,E Yazgan,G Barbagli,R D’Alessandro,S Khalil,B Stieger,Benjamin R Safdi ,M Maes,A A Ocampo Rios ,A Gozzelino,P Vitulo,D Stickland,A Tsirou,C Diez Pardos ,N Pastika,P Vanlaer,Y Ivanov,M Calderón De La Barca Sánchez ,M Jarvis,M Pierini,R Ciesielski,S Simon,P T Cox,A Panagiotou,C Biino,D Lomidze,D Bourilkov,P Silva,D Barge,K Stenson,A López ,D Summers,C Prescott,I Suarez,W Funk,Y Gershtein,V Gavrilov,S Paramesvaran,F Palla,P Giacomelli,M D’Alfonso,S Mersi,A Bocci,C Sander,M Dželalija ,D Kovalskyi,N Valls,M Ivova Rikova ,C Amsler,L Sulak,K Sung,M Kazana,C Fantasia,C Lin,N Tyurin,L Benucci,G R Snow,V Stolin,F Siklér ,H Liu,C Schäfer,E Tuovinen,C Fernandez Bedoya ,E Boos,N Varelas,A Pfeiffer,B Millán Mejías ,E Dietz-Laursonn,A Vartak,M B Tonjes,J L Faure,L Uvarov,K Buńkowski ,S Linn,T Ma,J.-P Merlo,I Bayshev,Y Tu,H Jensen,L Scodellaro,E A Wenger,J R Patterson,D Green,F Fabozzi,R Ruchti,L Perrozzi,M Zakaria,S Czellár ,S Kang,Hans Hoffmann ,N Adam,A T Meneguzzo,R Paramatti,R Y Zhu,C Riccardi,N Pietsch,K A Hahn,G Selvaggi,F Hoehle,L Orsini,Y J Lee ,T Dahms,R Gupta,Sandra S Padula ,T Rodrigo,N Manthos,E Kuznetsova,A F Osório Oliveros ,J Yelton,M Grothe,A Montanari,M E Pol,H Snoek,M Chasco,A Mohammadi,N Rompotis,G Sultanov,S Choudhury,G Petrillo,J Olson,A Sanchez ,J M Vizan Garcia ,D Majumder,R Bellan,B C Radburn-Smith,P Azzurri,E Cortina Gil ,K Maeshima,S Cittolin,K Theofilatos,A Kraan,S Gonzi,I Kravchenko,A Lanaro,A Benaglia,D D’Enterria,F Moortgat,A Brinkerhoff,S Chauhan,A Martelli,R Rossin,S Colafranceschi,C Roland,R Schöfbeck,M H Zoeller,A Massironi,P Tan,A Gude,O Grachov,S Kesisoglou,T Aliev,K M Ecklund,B Snook,N Heracleous,F Ligabue,D Giordano,P Lamichhane,E Petrakou,B Işıldak ,S Fonseca De Souza ,G Benelli,L Barone,M Tadel,K Klein,C Mariotti,R Magaña Villalba ,I Katkov,G Organtini,I Shipsey,M Rodozov,G Flügge,E Casimiro Linares ,K Hatakeyama,M Chiorboli,F Cossutti,A M Sirunyan,A Toropin,S K Nam,I Volobouev,K Kotov,V Krychkine,A Venturi,G Flucke,E Alagöz ,S Gninenko,L Mundim,D Petyt,G M Chen,O Kodolova,P Levchenko,S Harper,P Wagner,P Martinez Ruiz Del Arbol ,C A Carrillo Montoya ,J Berryhill,V J Smith,G P Heath,J Eugster,S Stoykova,S W Li,C Hajdú ,R Hadjiiska,V Hagopian,P Raics,P Baringer,S H Chang ,N Amapane,M Jo,S Elgammal,J Butt,P D Luckey,D Sunar Cerci ,J Incandela,A Lopez Virto ,J Lange,R Hall-Wilton,J Wang,M Makouski,M Krammer,S Shmatov,J Luetic,R Erbacher,C H Jiang,A Romero,S B Beri,A Sánchez-Hernández,J St John ,A Uzunian,J Marco,S Sekmen,M Bóna ,S Song,F Giordano,W Gabella,M Malek,J Wood,E Berry,D Sperka,O Boeriu,M Kasemann,T Khurshid,G Majumder,S Naumann-Emme,D Baumgartel,J.-L Agram,C Dozen,D Blöch ,M Konecki,I A Cali,A Graziano,G Hall,P Lawson,G Nicolas Kaufman ,D Mekterović ,B Dorney,C Tully,S K Park,G Kaußen ,A Pompili,B Ille,A Zarubin,K Ranjan,P Bortignon,G Önengüt ,G I Veres,A Luthra,J Chen,E Calvo,M Rovere,M M Baarmand,A Skuja,J Russ,J Hrubec,Ž Antunović ,M Hildreth,P Juillot,M Mohammadi Najafabadi ,Sa Jain ,V O’Dell,D Velicanu,G Sguazzoni,P Markowitz,N Beliy,M S Soares,T Kurča ,M Bachtis,M Costa,S Dasu,A Dimitrov,P Hebda,C Charlot,L Guiducci,I Osipenkov,V Veszprémi ,D Favart,K Öcalan ,N Wickramage,J Goldstein,G A Pierro,S V Gleyzer,M Besançon ,F Beaudette,H Castilla‐Valdez ,P Harris,R Eusebi,H Malbouisson,P Zalewski,H C Kaestli,H Sakulin,D Loukas,C Botta,O Hindrichs,S Erhan,A P Singh,C Henderson,M Dragicevic,D De Jesus Damiao ,G Davies,M Bluj,E Appelt,M Murray,M U Mozer,Wolfram Dietrich Zeuner ,A Rýd ,M Giffels,M Gouzevitch,M Grünewald ,M Cerrada,A Dermenev,K Doroba,D.d Reeder ,F Ratnikov,V Brigljević ,Z L Trocsanyi,M I Josa,N Demaria,R Travaglini,P H Butler,Р Тенчини ,N V Tran,L Gray,E Ntomari,Y Onel,J Zhang,V Epshteyn,T Rovelli,M Hohlmann,S Nourbakhsh,C Liu,R Sever,E Olaiya,A Mohapatra,F Vazquez Valencia ,G Karapostoli,W Wu,S P Singh,A Pashenkov,A Ostapchuk,B Lee,J Letts,M Takahashi,R Ryutin,C Newman-Holmes,I Heredia-De La Cruz ,D Nguyen,A C Benvenuti,N Mccoll,T Tuuva,E Eşkut ,M Cepeda,Z Hu,В Сулимов ,C Civinini,P Geffert,G Martı́nez ,R Wigmans,P Meridiani,W J Spalding,L Levchuk,V Valuev,D Wright,D Klingebiel,Jinfei Wu ,F Würthwein,L Foà,S Maruyama,A Ghezzi,F Santanastasio,D Puigh,W K Sakumoto ,M Herndon,J Tucker,A Savin,H J Simonis,M Johnson,F Fabbri,J Yoo,J Fay,M Abbrescia,J Piedra Gomez ,E Stiliaris,H Kim,J Lingemann,A Chatterjee,D Demir,M Nespolo,T Sinthuprasith,D Ralph,Arun Kumar ,B De La Cruz ,W Hopkins,N Marinelli,N Lychkovskaya,X Meng,A Campbell,S A Tupputi ,C Laganá ,R Walsh,K Lannon,M Ćwiok ,J Cuevas,A Rácz ,H R Hoorani,D Strom,K Ozdemir,М Фингер ,M Mannelli,M Erdmann,S Boutle,A Beretvas,V Ciulli,V Oreshkin,D Acosta,U Goerlach,M Velasco,G Iles,Y Assran,M Zieliński ,R Carlin,S Sumowidagdo,M E Mattson ,A Sill,M Schröder,D Sabes,A Staiano,I Lokhtin,N Chanon,J Malclès ,H D Yoo,Y M Tzeng,W Johns,K Mazumdar,J H Kim,M Lebourgeois,L Martini,J Wetzel,M Schmitt,L A T Bauerdick,S Arora,K Petridis,A Tapper,L Lloret Iglesias ,L Caminada,A Mestvirishvili,J S Keller ,T Rohe,G Mitselmakher,H Saka,Z Szillási ,K Deiters,V Chiochia,L Vanelderen,M Fisher,G Mesyats,L Antonelli,S Bitioukov,D Pellett,J F Low,I Puljak,Y Musienko,B Bilki,H Bakhshiansohi,D Bortoletto,U Heintz,J Ott,J Bellinger ,C Brew,A H Ball,G Auzinger,V Bhatnagar,M Lethuillier,P Janot,L Muñiz ,M Marone,A Stahl,T Medvedeva,H Kirschenmann,G E Bruno ,J Rodrigues Antunes ,A Elliott-Peisert,J Molnár ,P Lobelle Pardo ,P Capiluppi,S Lowette,R Gonzalez Suarez ,P Adžić ,I J Cabrillo,A Kharchilava,C H Shepherd-Themistocleous,C Schwick,C Martínez Rivero ,L Basso,A Mussgiller,J Bunn,H Nguyen,J Hegeman,C Kleinwort,I Hoş ,R Marco,A Fanfani,T J Kim,J Richman,P G Ferreira Parracho ,J G Acosta,S Lehti,M Cardaci,J Thompson,N Cartiglia,T Camporesi,V Palichik,J Tuominiemi,J De Favereau De Jeneret ,T Dorigo,K Yi,M Kaya,G Landsberg,J B Singh ,R Wolf,J A Coarasa Perez ,B Pavlov,A Taurok,A Gilbert,Y Chào ,S Malvezzi,S Bianco,R Bainbridge,D Wang,J Pálinkás ,P Azzi,A Kropivnitskaya,C Autermann,I Ahmed,A Bean,K Lassila-Perini,Y Eshaq,V Sharma,L Fiore,S Schnetzer,J Y Kim,E De La Cruz-Burelo ,A Holzner,G P Siroli ,T Aziz,V Krutelyov,R M Harris,H F Heath,S Ahuja,A Belyaev,H Schettler,J E Cole,A Petrilli,J Nash,A Adair,M Sobron Sañudo ,L Bäni,M Zeyrek,A Branca,A Messineo,F J M Geurts,M Weinberg,M Chen,P Eerola,M Margoni,T Adams,N Eggert,Yang Yu ,A Vinogradov,A Bethani,J L Rodriguez,N Dhingra,M Kadastik,S Maselli,J Hauk,L K Saini,M Simon,D Colling,R 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Kottachchi Kankanamge Don ,S Spanier,M Raidal,J Y C Tam ,M C Sawley ,P Lenzi,C De Oliveira Martins ,P Paolucci,R Patel,J Jackson,E M Gregores,R Harr,C Vander Velde ,C E Gerber,I González Caballero ,S Rappoccio,V Lemaı̂tre ,G Vander Marcken ,M Arneodo,P Garcı́a-Abia ,P Rumerio,A Pozdnyakov,C Paus,A Çakır ,M Rodenburg,A T Serban,G Pugliese,A Tatarinov,L Sonnenschein,N Nishu,A Sharma,R Covarelli,R Rougny,T Kamon,A Ferapontov,P Kurt,P Depasse

doi:10.1140/epjc/s10052-011-1839-3

Abstract

A study of forward energy flow and central charged-particle multiplicity in events with W and Z bosons decaying into leptons is presented. The analysis uses a sample of 7 TeV pp collisions, corresponding to an integrated luminosity of 36 inverse picobarns, recorded by the CMS experiment at the LHC. The observed forward energy depositions, their correlations, and the central charged-particle multiplicities are not well described by the available non-diffractive soft-hadron production models. A study of about 300 events with no significant energy deposited in one of the forward calorimeters, corresponding to a pseudorapidity gap of at least 1.9 units, is also presented. An indication for a diffractive component in these events comes from the observation that the majority of the charged leptons from the (W/Z) decays are found in the hemisphere opposite to the gap. When fitting the signed lepton pseudorapidity distribution of these events with predicted distributions from an admixture of diffractive (POMPYT) and non-diffractive (PYTHIA) Monte Carlo simulations, the diffractive component is determined to be (50.0 +/- 9.3 (stat.) +/- 5.2 (syst.))%.

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