Long-range and short-range dihadron angular correlations in central PbPb collisions at $ \sqrt {{{s_{\text{NN}}}}} $ = 2.76 TeV

S Chatrchyan,P Tan,F Meijers,D Hartley,H B Newman,D Demir,F Würthwein,N J Hadley,G Boudoul,L Lista,J Merz,A Nappi,F Stöckli,G Anagnostou,S Folgueras,F Moortgat,P Lobelle Pardo,Z K Liu,J Alcaraz Maestre,T Rodrigo,D Pedrini,D J Kong,M Lethuillier,D Sabes,M Mulders,N Varelas,S Nuzzo,E Casimiro Linares,V Monaco,N Schul,M Wayne,R Hirosky,M Ata,A Ruiz-Jimeno,B Mura,J Lange,M Chertok,D Sprenger,G Kukartsev,J W Gary,V Khotilovich,S Lowette,M Merschmeyer,P Siegrist,A Benaglia,D Montanino,M Tytgat,N Marinelli,D Favart,L Gutay,Y Ban,M J Kortelainen,R Khurana,A Sakharov,I Vorobiev,K Gunthoti,I Mikulec,G Roselli,A York,M De Gruttola,O Militaru,E Auffray,S Hänsel,N Amapane,S M Etesami,M Zakaria,O Oberst,L Benhabib,C Willmott,M Schröder,A Drozdetskiy,H El Mamouni,D Loukas,S Qazi,C Campagnari,W Luo,G Bencze,N Leonardo,S Padhi,S De Visscher,Y Zheng,D Contardo,R R Betts,S Elgammal,B Clerbaux,V M Ghete,R Breedon,D Petyt,A Montanari,S Gonzi,V Khachatryan,S Won,M Krammer,P Luukka,L Perrozzi,A Pin,A Kalinowski,M Barrett,A Uzunian,R Vidal,L Rebane,A Perrotta,I Iashvili,D Mesa,A Kraan,D Benedetti,L Wehrli,M Zeinali,A Sparrow,S P Shipkowski,V Cuplov,M Titov,A Belyaev,I A Cali,P Capiluppi,S Sengupta,P Avery,H Park,G Nicolas Kaufman,F Beaudette,E A Albayrak,O Koybasi,E Di Marco,M Tadel,A F Garfinkel,Y Ma,D Toback,J M Vizan Garcia,J Ziegler,K F Chen,G Wrochna,A Avetisyan,J A Bakken,J Conway,Y Assran,W Zou,J Seixas,T Y Ling,G Grégoire,J Rodrigues Antunes,A Guneratne Bryer,V Chetluru,J Ellison,M Z Mehta,D Barge,L Lusito,R.-S Lu,A Barker,I Kravchenko,T Hebbeker,L Agostino,P Kalavase,Y Kuessel,K Ranjan,Y Kim,D M Morse,D Menasce,L Demortier,J Tomaszewska,A Pozdnyakov,D Tornier,R Cavanaugh,M Hildreth,A Pashenkov,I Belotelov,J Caudron,M Johnson,M Dittmar,F M Stober,A Savin,G Giurgiu,E Petrakou,N Redaelli,A M Guler,J.-P Merlo,A Branca,J.-C Fontaine,T Kuhr,D Ralph,U Gebbert,N Pietsch,D Ungaro,A Zhokin,E M Da Costa,R Ruchti,N Shumeiko,V Valuev,J Chen,V D Elvira,Y Ivanov,V Halyo,I Volobouev,J Thompson,S Mersi,Z Hatherell,J Ott,S Esen,J Cuevas,A Dimitrov,M I Josa,L M Lebolo,M Makouski,J Marco,B P Padley,M Konecki,M Feindt,D Liko,L Kramer,M Pernicka,I M Anghel,A Korablev,E Twedt,T Schum,K Gill,B Roland,Y Iiyama,S W Lee,C Jorda,E Olaiya,T Lindén,R Gupta,R Kelley,M Vergili,U Baur,N Eggert,A Flossdorf,R Schmidt,R Gokieli,A J Bell,A Kropivnitskaya,R Arcidiacono,P C Bhat,D Stickland,J Bauer,C Urscheler,E Vlasov,M Arneodo,A Whitbeck,G Kozlov,S Vavilov,D Green,A Toropin,S Park,C A Bernardes,M Chan,S Tuo,D Reeder,S Fonseca De Souza,T Miceli,J A Coughlan,C Newman-Holmes,J Butt,L Sarycheva,S Costantini,F Rebassoo,J P Fernández Ramos,W Waltenberger,M Issah,E Halkiadakis,S Slabospitsky,C Calabria,E Sudano,D Piccolo,N Pozzobon,V Kumar,N Cavallo,J Lellouch,G Sguazzoni,B A Barnett,L M Villasenor-Cendejas,L Gouskos,M Azarkin,J L Faure,N Chanon,P Goldenzweig,S Simon,J Olzem,P G Ferreira Parracho,A Massironi,S Ovyn,F De Guio,D Heydhausen,S Albergo,K Goulianos,P Martinez Ruiz Del Arbol,C Tully,M Mooney,R Wallny,M Passaseo,J Zabel,D Domínguez Vázquez,V Popov,Y Sirois,N Ratnikova,M Cardaci,P Katsas,S Paktinat Mehdiabadi,K Kaschube,D C Miner,P Lecomte,M Gallinaro,M Malek,A Heister,R Frühwirth,E Torassa,N Sen,R D Field,M Mannelli,J Veverka,L Mirabito,D Lopes Pegna,S Gollapinni,C Hackstein,P Schleper,E Migliore,W D Teo,L Tourtchanovitch,M Müntel,O Bondu,C R Newsom,P Juillot,U Heintz,M Pelliccioni,M Wang,S Dugad,J Velkovska,N Odell,E B Ziebarth,M Chen,E Meschi,V Grishin,A Bornheim,G Bruno,T Orimoto,T Kress,M Chasco,V Stolin,W Van Doninck,J Mousa,M Bontenackels,T Geralis,Y J Lei,A Baden,S Cittolin,Y F Liu,Y Onel,W Ko,J Alexander,I Svintradze,L Guiducci,I Puljak,J N Butler,I Lokhtin,A Korpela,E Karavakis,L Zhang,P Bloch,D Wright,E Calvo,C Liu,Yu Andreev,M Pimiä,S Guragain,V Karimäki,S Dasu,R Cousins,R Montalvo,S Ochesanu,R Dell’Orso,A Moeller,D M Newbold,S Bose,M Dragicevic,D Engh,B Klima,A De Cosa,A Gurtu,R Kinnunen,M Bergholz,S I Cooper,P E Karchin,B Pollack,M A Mahmoud,L 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doi:10.1007/jhep07(2011)076

Abstract

First measurements of dihadron correlations for charged particles are presented for central PbPb collisions at a nucleon-nucleon center-of-mass energy of 2.76 TeV over a broad range in relative pseudorapidity, Delta(eta), and the full range of relative azimuthal angle, Delta(phi). The data were collected with the CMS detector, at the LHC. A broadening of the away-side (Delta(phi) approximately pi) azimuthal correlation is observed at all Delta(eta), as compared to the measurements in pp collisions. Furthermore, long-range dihadron correlations in Delta(eta) are observed for particles with similar phi values. This phenomenon, also known as the "ridge", persists up to at least |Delta(eta)| = 4. For particles with transverse momenta (pt) of 2-4 GeV/c, the ridge is found to be most prominent when these particles are correlated with particles of pt = 2-6 GeV/c, and to be much reduced when paired with particles of pt = 10-12 GeV/c.

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