@article{3150679,
    title = "Measurement of the underlying event activity at the LHC with root s=7
TeV and comparison with root s=0.9 TeV",
    author = "Chatrchyan, S. and Khachatryan, V. and Sirunyan, A. M. and Tumasyan, A. and and Adam, W. and Bergauer, T. and Dragicevic, M. and Eroe, J. and and Fabjan, C. and Friedl, M. and Fruehwirth, R. and Ghete, V. M. and and Hammer, J. and Haensel, S. and Hoch, M. and Hoermann, N. and Hrubec, J. and and Jeitler, M. and Kiesenhofer, W. and Krammer, M. and Liko, D. and and Mikulec, I. and Pernicka, M. and Rohringer, H. and Schoefbeck, R. and and Strauss, J. and Taurok, A. and Teischinger, F. and Wagner, P. and and Waltenberger, W. and Walzel, G. and Widl, E. and Wulz, C. -E. and and Mossolov, V. and Shumeiko, N. and Gonzalez, J. Suarez and Bansal, S. and and Benucci, L. and De Wolf, E. A. and Janssen, X. and Maes, J. and Maes, T. and and Mucibello, L. and Ochesanu, S. and Roland, B. and Rougny, R. and and Selvaggi, M. and Van Haevermaet, H. and Van Mechelen, P. and Van and Remortel, N. and Blekman, F. and Blyweert, S. and D'Hondt, J. and and Devroede, O. and Suarez, R. Gonzalez and Kalogeropoulos, A. and Maes, M. and and Van Doninck, W. and Van Mulders, P. and Van Onsem, G. P. and and Villella, I. and Charaf, O. and Clerbaux, B. and De Lentdecker, G. and and Dero, V. and Gay, A. P. R. and Hammad, G. H. and Hreus, T. and Marage, and P. E. and Thomas, L. and Vander Velde, C. and Vanlaer, P. and Adler, V. and and Cimmino, A. and Costantini, S. and Grunewald, M. and Klein, B. and and Lellouch, J. and Marinov, A. and Mccartin, J. and Ryckbosch, D. and and Thyssen, F. and Tytgat, M. and Vanelderen, L. and Verwilligen, P. and and Walsh, S. and Zaganidis, N. and Basegmez, S. and Bruno, G. and Caudron, and J. and Ceard, L. and Gil, E. Cortina and De Jeneret, J. De Favereau and and Delaere, C. and Favart, D. and Giammanco, A. and Gregoire, G. and and Hollar, J. and Lemaitre, V. and Liao, J. and Militaru, O. and Ovyn, S. and and Pagano, D. and Pin, A. and Piotrzkowski, K. and Schul, N. and Beliy, and N. and Caebergs, T. and Daubie, E. and Alves, G. 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S. and Grothe, M. and Hall-Wilton, R. and and Herndon, M. and Herve, A. and Klabbers, P. and Klukas, J. and Lanaro, A. and and Lazaridis, C. and Leonard, J. and Loveless, R. and Mohapatra, A. and and Palmonari, F. and Reeder, D. and Ross, I. and Savin, A. and Smith, W. H. and and Swanson, J. and Weinberg, M. and CMS Collaboration",
    journal = "Journal of High Energy Physics",
    year = "2011",
    number = "9",
    publisher = "Springer-Verlag",
    issn = "1126-6708, 1029-8479",
    doi = "10.1007/JHEP09(2011)109",
    keywords = "Hadron-Hadron Scattering",
    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."
}