Measurement of the underlying event activity in pp collisions at and 7 TeV with the novel jet-area/median approach

S. Chatrchyan,V. Khachatryan,A. M. Sirunyan, A. Tumasyan, W. Adam, T. Bergauer, M. Dragicevic, J. Erö, C. Fabjan, M. Friedl, R. Frühwirth,V. M. Ghete,J. Hammer, N. Hörmann, J. Hrubec, M. Jeitler, W. Kiesenhofer, V. Knünz, M. Krammer, D. Liko, I. Mikulec, M. Pernicka, B. Rahbaran, C. Rohringer, H. Rohringer, R. Schöfbeck,J. Strauss, A. Taurok, F. Teischinger,P. Wagner,W. Waltenberger, G. Walzel, E. Widl, C. E. Wulz,V. Mossolov, N. Shumeiko,J. Suarez Gonzalez, S. Bansal,K. Cerny,T. Cornelis,E. A. De Wolf, X. Janssen, S. Luyckx, T. Maes, L. Mucibello, S. Ochesanu,B. Roland, R. Rougny, M. Selvaggi,H. Van Haevermaet,P. Van Mechelen,N. Van Remortel,A. Van Spilbeeck, F. Blekman,S. Blyweert, J. D'Hondt,R. Gonzalez Suarez, A. Kalogeropoulos,M. Maes, A. Olbrechts,W. Van Doninck,P. Van Mulders,G. P. Van Onsem, I. Villella, O. Charaf,B. Clerbaux,G. De Lentdecker, V. Dero,T. Hreus, A. Léonard,P. E. Marage, L. Thomas,C. Vander Velde, P. Vanlaer,V. Adler, K. Beernaert,A. Cimmino, S. Costantini,G. Garcia, M. Grunewald,B. Klein,J. Lellouch, A. Marinov, J. McCartin,A. A. Ocampo Rios,D. Ryckbosch, N. Strobbe, F. Thyssen, M. Tytgat, L. Vanelderen,P. Verwilligen,S. Walsh, E. Yazgan, N. Zaganidis,S. Basegmez,G. Bruno, A. Caudron, L. Ceard, C. Delaere,T. Du Pree, D. Favart, L. Forthomme, A. Giammanco, J. Hollar,V. Lemaitre,J. Liao, O. Militaru,C. Nuttens, D. Pagano, L. Perrini,A. Pin,K. Piotrzkowski, N. Schul, N. Beliy,T. Caebergs, E. Daubie, G. H. Hammad,G. A. Alves,M. Correa Martins Junior,D. De Jesus Damiao, T. Martins,M. E. Pol, M. H.G. Souza,W. L. Aldá Juńior,W. Carvalho, A. Custódio,E. M. Da Costa,C. De Oliveira Martins,S. Fonseca De Souza,D. Matos Figueiredo, L. Mundim, H. Nogima, V. Oguri,W. L. Prado Da Silva,A. Santoro,S. M. Silva Do Amaral,L. Soares Jorge,A. Sznajder, T. S. Anjos,C. A. Bernardes, F. A. Dias,T. R. Fernandez Perez Tomei,E. M. Gregores, C. Lagana,F. Marinho, P. G. Mercadante, S. F. Novaes,Sandra S. Padula,V. Genchev, P. Iaydjiev, S. Piperov, M. Rodozov, S. Stoykova, G. Sultanov, V. Tcholakov, R. Trayanov,M. Vutova,A. Dimitrov, R. Hadjiiska, A. Karadzhinova,V. Kozhuharov,L. Litov, B. Pavlov,P. Petkov, J. G. Bian, G. M. Chen, H. S. Chen, C. H. Jiang,D. Liang, S. Liang,X. Meng, J. Tao, J. Wang, X. Wang,Z. Wang, H. Xiao, M. Xu,J. Zang,Z. Zhang,C. Asawatangtrakuldee, Y. Ban,S. Guo, Y. Guo, W. Li, S. Liu,Y. Mao,S. J. Qian, H. Teng, S. Wang,B. Zhu,W. Zou, C. Avila,B. Gomez Moreno,A. F. Osorio Oliveros, J. C. Sanabria, N. Godinovic, D. Lelas, R. Plestina, D. Polic, I. Puljak,Z. Antunovic, M. Dzelalija,M. Kovac, V. Brigljevic,S. Duric, K. Kadija,J. Luetic,S. Morovic,A. Attikis, M. Galanti, G. Mavromanolakis,J. Mousa,C. Nicolaou, F. Ptochos,P. A. Razis, M. Finger,Y. Assran,S. Elgammal,A. Ellithi Kamel,S. Khalil,M. A. Mahmoud,A. Radi, M. Kadastik,M. Müntel,M. Raidal, L. Rebane, A. Tiko,V. Azzolini,P. Eerola, G. Fedi, M. Voutilainen, S. Czellar, J. Härkönen,A. Heikkinen, V. Karimäki, R. Kinnunen, M. J. Kortelainen, T. Lampén, K. Lassila-Perini, S. Lehti,T. Lindén,P. Luukka, T. Mäenpää, T. Peltola, E. Tuominen, J. Tuominiemi, E. Tuovinen, D. Ungaro,L. Wendland, K. Banzuzi, A. Korpela, T. Tuuva, M. Besancon,S. Choudhury, M. Dejardin,D. Denegri, B. Fabbro,J. L. Faure,F. Ferri, S. Ganjour, A. Givernaud, P. Gras,G. Hamel De Monchenault, P. Jarry,E. Locci, J. Malcles, L. Millischer, J. Rander,A. Rosowsky,I. Shreyber,M. Titov, S. Baffioni, F. Beaudette, L. Benhabib,L. Bianchini, M. Bluj, C. Broutin,P. Busson, C. Charlot, N. Daci, T. Dahms, L. Dobrzynski,R. Granier De Cassagnac, M. Haguenauer, P. Miné, C. Mironov, C. Ochando, P. Paganini,D. Sabes, R. Salerno, Y. Sirois, C. Veelken, A. Zabi,J. L. Agram, J. Andrea,D. Bloch, D. Bodin, J. M. Brom,M. Cardaci,E. C. Chabert, C. Collard,E. Conte, F. Drouhin,C. Ferro, J. C. Fontaine, D. Gelé, U. Goerlach, P. Juillot,M. Karim,A. C. Le Bihan,P. Van Hove,F. Fassi, D. Mercier, C. Baty,S. Beauceron, N. Beaupere, M. Bedjidian, O. Bondu, G. Boudoul, D. Boumediene, H. Brun, J. Chasserat,R. Chierici,D. Contardo, P. Depasse,H. El Mamouni, A. Falkiewicz,J. Fay,S. Gascon, M. Gouzevitch, B. Ille, T. Kurca,T. Le Grand, M. Lethuillier, L. Mirabito,S. Perries,V. Sordini, S. Tosi, Y. Tschudi, P. Verdier, S. Viret,Z. Tsamalaidze,G. Anagnostou,S. Beranek, M. Edelhoff, L. Feld, N. Heracleous, O. Hindrichs, R. Jussen,K. Klein, J. Merz, A. Ostapchuk,A. Perieanu, F. Raupach, J. Sammet,S. Schael, D. Sprenger,H. Weber, B. Wittmer,V. Zhukov,M. Ata, J. Caudron, E. Dietz-Laursonn, D. Duchardt,M. Erdmann,R. Fischer,A. Güth, T. Hebbeker, C. Heidemann, K. Hoepfner, T. Klimkovich, D. Klingebiel,P. Kreuzer, D. Lanske,J. Lingemann, C. Magass, M. Merschmeyer,A. Meyer, M. Olschewski, P. Pa-Pacz, H. Pieta, H. Reithler, S. A. Schmitz,L. Sonnenschein, J. Steggemann, D. Teyssier,M. Weber, M. Bontenackels, V. Cherepanov, M. Davids, G. Flügge, H. Geenen, M. Geisler,W. Haj Ahmad, F. Hoehle, B. Kargoll, T. Kress,Y. Kuessel, A. Linn,A. Nowack, L. Perchalla, O. Pooth, J. Rennefeld, P. Sauerland,A. Stahl,M. Aldaya Martin,J. Behr, W. Behrenhoff, U. Behrens, M. Bergholz,A. Bethani, K. Borras,A. Burgmeier,A. Cakir, L. Calligaris, A. Campbell,E. Castro, F. Costanza, D. Dammann, G. Eckerlin,D. Eckstein, G. Flucke, A. Geiser, I. Glushkov, P. Gunnellini, S. Habib, J. Hauk, G. Hellwig, H. Jung, M. Kasemann, P. Katsas, C. Kleinwort, H. Kluge,A. Knutsson, M. Krämer, D. Krücker, E. Kuznetsova,W. Lange,W. Lohmann,B. Lutz, R. Mankel,I. Marfin, M. Marienfeld, I. A. Melzer-Pellmann,A. B. Meyer, J. Mnich,A. Mussgiller,S. Naumann-Emme, J. Olzem,H. Perrey,A. Petrukhin, D. Pitzl, A. Raspereza,P. M. Ribeiro Cipriano,C. Riedl,M. Rosin,J. Salfeld-Nebgen,R. Schmidt, T. Schoerner-Sadenius,N. Sen,A. Spiridonov, M. Stein,R. Walsh, C. Wissing, C. Autermann,V. Blobel, S. Bobrovskyi, J. Draeger, H. Enderle, J. Erfle, U. Gebbert, M. Görner, T. Hermanns,R. S. Höing, K. Kaschube, G. Kaussen, H. Kirschenmann, R. Klanner,J. Lange, B. Mura

user-614d54c3e55422cecdb064d4(2012)

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摘要
The first measurement of the charged component of the underlying event using the novel "jet-area/median" approach is presented for proton-proton collisions at centre-of-mass energies of 0.9 and 7 TeV. The data were recorded in 2010 with the CMS experiment at the LHC. A new observable, sensitive to soft particle production, is introduced and investigated inclusively and as a function of the event scale defined by the transverse momentum of the leading jet. Various phenomenological models are compared to data, with and without corrections for detector effects. None of the examined models describe the data satisfactorily.
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关键词
Large Hadron Collider,Jet (fluid),Observable,Particle physics,Nuclear physics,Detector,Function (mathematics),Physics,Median approach,Transverse momentum,Underlying event
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