Measurement of the underlying event activity at the LHC with root s=7 TeV and comparison with root s=0.9 TeV

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Abstract

A measurement of the underlying activity in events with a jet of transverse momentum in the several GeV region is performed in proton-proton collisions at root s = 0.9 and 7 TeV, using data collected by the CMS experiment at the LHC. The production of charged particles with pseudorapidity vertical bar eta vertical bar < 2 and transverse momentum p(T) > 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-p(T) sum of the particles in the transverse region is observed with increasing p(T) of the leading track-jet, followed by a much slower rise above a few GeV/c. For track-jet p(T) 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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  • Chatrchyan S , Khachatryan V , Sirunyan AM , Tumasyan A , Adam W , Bergauer T , Dragicevic M , Ero J , Fabjan C , Friedl M , Fruhwirth R , Ghete VM , Hammer J , Hansel S , Hoch M , Hormann N , Hrubec J , Jeitler M , Kiesenhofer W , Krammer M , Liko D , Mikulec I , Pernicka M , Rohringer H , Schofbeck R , Strauss J , Taurok A , Teischinger F , Wagner P , Waltenberger W , Walzel G , Widl E , Wulz CE , Mossolov V , Shumeiko N , Gonzalez JS , Bansal S , Benucci L , De Wolf EA , Janssen X , Maes J , Maes T , Mucibello L , Ochesanu S , Roland B , Rougny R , Selvaggi M , Van Haevermaet H , Van Mechelen P , Van Remortel N , Blekman F , Blyweert S , D'Hondt J , Devroede O , Suarez RG , Kalogeropoulos A , Maes M , Van Doninck W , Van Mulders P , Van Onsem GP , Villella I , Charaf O , Clerbaux B , De Lentdecker G , Dero V , Gay APR , Hammad GH , Hreus T , Marage PE , Thomas L , Vander Velde C , Vanlaer P , Adler V , Cimmino A , Costantini S , Grunewald M , Klein B , Lellouch J , Marinov A , Mccartin J , Ryckbosch D , Thyssen F , Tytgat M , Vanelderen L , Verwilligen P , Walsh S , Zaganidis N , Basegmez S , Bruno G , Caudron J , Ceard L , Gil EC , De Jeneret JD , Delaere C , Favart D , Giammanco A , Gregoire G , Hollar J , Lemaitre V , Liao J , Militaru O , Ovyn S , Pagano D , Pin A , Piotrzkowski K , Schul N , Beliy N , Caebergs T , Daubie E , Alves GA , Damiao DDJ , Pol ME , Souza MHG , Carvalho W , Da Costa EM , Martins CD , De Souza SF , Mundim L , Nogima H , Oguri V , Da Silva WLP , Santoro A , Do Amaral SMS , Sznajder A , Bernardes CA , Dias FA , Tomei TRFP , Gregores EM , Lagana C , Marinho F , Mercadante PG , Novaes SF , Padula SS , Darmenov N , Genchev V , Iaydjiev P , Piperov S , Rodozov M , Stoykova S , Sultanov G , Tcholakov V , Trayanov R , Dimitrov A , Hadjiiska R , Karadzhinova A , Kozhuharov V , Litov L , Mateev M , Pavlov B , Petkov P , Bian JG , Chen GM , Chen HS , Jiang CH , Liang D , Liang S , Meng X , Tao J , Wang J , Wang J , Wang X , Wang Z , Xiao H , Xu M , Zang J , Zhang Z , Ban Y , Guo S , Guo Y , Li W , Mao Y , Qian SJ , Teng H , Zhu B , Zou W , Cabrera A , Moreno BG , Rios AAO , Oliveros AFO , Sanabria JC , Godinovic N , Lelas D , Lelas K , Plestina R , Polic D , Puljak I , Antunovic Z , Dzelalija M , Brigljevic V , Duric S , Kadija K , Morovic S , Attikis A , Galanti M , Mousa J , Nicolaou C , Ptochos F , Razis PA , Finger M , Finger M , Assran Y , Khalil S , Mahmoud MA , Hektor A , Kadastik M , Muntel M , Raidal M , Rebane L , Azzolini V , Eerola P , Fedi G , Czellar S , Harkonen J , Heikkinen A , Karimaki V , Kinnunen R , Kortelainen MJ , Lampen T , Lassila-Perini K , Lehti S , Linden T , Luukka P , Maenpaa T , Tuominen E , Tuominiemi J , Tuovinen E , Ungaro D , Wendland L , Banzuzi K , Korpela A , Tuuva T , Sillou D , Besancon M , Choudhury S , Dejardin M , Denegri D , Fabbro B , Faure JL , Ferri F , Ganjour S , Gentit FX , Givernaud A , Gras P , de Monchenault GH , Jarry P , Locci E , Malcles J , Marionneau M , Millischer L , Rander J , Rosowsky A , Shreyber I , Titov M , Verrecchia P , Baffioni S , Beaudette F , Benhabib L , Bianchini L , Bluj M , Broutin C , Busson P , Charlot C , Dahms T , Dobrzynski L , Elgammal S , de Cassagnac RG , Haguenauer M , Mine P , Mironov C , Ochando C , Paganini P , Sabes D , Salerno R , Sirois Y , Thiebaux C , Wyslouch B , Zabi A , Agram JL , Andrea J , Bloch D , Bodin D , Brom JM , Cardaci M , Chabert EC , Collard C , Conte E , Drouhin F , Ferro C , Fontaine JC , Gele D , Goerlach U , Greder S , Juillot P , Karim M , Le Bihan AC , Mikami Y , Van Hove P , Fassi F , Mercier D , Baty C , Beauceron S , Beaupere N , Bedjidian M , Bondu O , Boudoul G , Boumediene D , Brun H , Chasserat J , Chierici R , Contardo D , Depasse P , El Mamouni H , Fay J , Gascon S , Ille B , Kurca T , Le Grand T , Lethuillier M , Mirabito L , Perries S , Sordini V , Tosi S , Tschudi Y , Verdier P , Lomidze D , Anagnostou G , Edelhoff M , Feld L , Heracleous N , Hindrichs O , Jussen R , Klein K , Merz J , Mohr N , Ostapchuk A , Perieanu A , Raupach F , Sammet J , Schael S , Sprenger D , Weber H , Weber M , Wittmer B , Ata M , Bender W , Dietz-Laursonn E , Erdmann M , Frangenheim J , Hebbeker T , Hinzmann A , Hoepfner K , Klimkovich T , Klingebiel D , Kreuzer P , Lanske D , Magass C , Merschmeyer M , Meyer A , Papacz P , Pieta H , Reithler H , Schmitz SA , S

Titolo volume/Rivista

JOURNAL OF HIGH ENERGY PHYSICS

Anno di pubblicazione

2011

ISSN

1126-6708

ISBN

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Numero di citazioni Wos

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Settori ERC

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