@article{3153704,
    title = "Measurement of the underlying event in the Drell-Yan process in
proton-proton collisions at root s=7 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 Hoch, M. and Hoermann, N. and Hrubec, J. and Jeitler, M. and and Kiesenhofer, W. and Krammer, M. and Liko, D. and Mikulec, I. and and Pernicka, M. and Rahbaran, B. and Rohringer, C. and Rohringer, H. and and Schoefbeck, R. and Strauss, J. and Taurok, A. and Teischinger, F. and and Wagner, P. and Waltenberger, W. and Walzel, G. and Widl, E. and Wulz, and C-E. and Mossolov, V. and Shumeiko, N. and Gonzalez, J. Suarez and and Bansal, S. and Benucci, L. and Cornelis, T. and De Wolf, E. A. and and Janssen, X. and Luyckx, S. and Maes, T. and Mucibello, L. and Ochesanu, and S. and Roland, B. and Rougny, R. and Selvaggi, M. and Van Haevermaet, H. and and Van Mechelen, P. and Van Remortel, N. and Van Spilbeeck, A. and and Blekman, F. and Blyweert, S. and D'Hondt, J. and Suarez, R. Gonzalez and and Kalogeropoulos, A. and Maes, M. and Olbrechts, A. and Van Doninck, W. and and Van Mulders, P. and Van Onsem, G. P. and Villella, I. and Charaf, O. and and Clerbaux, B. and De Lentdecker, G. and Dero, V. and Gay, A. P. R. and and Hammad, G. H. and Hreus, T. and Leonard, A. and Marage, P. E. and and Thomas, L. and Vander Velde, C. and Vanlaer, P. and Wickens, J. and and Adler, V. and Beernaert, K. and Cimmino, A. and Costantini, S. and and Garcia, G. and Grunewald, M. and Klein, B. and Lellouch, J. and Marinov, and A. and Mccartin, J. and Rios, A. A. Ocampo and Ryckbosch, D. and and Strobbe, N. and Thyssen, F. and Tytgat, M. and Vanelderen, L. and and Verwilligen, P. and Walsh, S. and Yazgan, E. and Zaganidis, N. and and Basegmez, S. and Bruno, G. and Ceard, L. and De Jeneret, J. De Favereau and and Delaere, C. and du Pree, T. and Favart, D. and Forthomme, L. and and Giammanco, A. and Gregoire, G. and Hollar, J. and Lemaitre, V. and Liao, and J. and Militaru, O. and Nuttens, C. and Pagano, D. and Pin, A. and and Piotrzkowski, K. and Schul, N. and Beliy, N. and Caebergs, T. and and Daubie, E. and Alves, G. A. and De Jesus Damiao, D. and Martins, T. and and Pol, M. E. and Souza, M. H. G. and Alda Junior, W. L. and Carvalho, W. and and Custodio, A. and Da Costa, E. M. and De Oliveira Martins, C. and and Fonseca De Souza, S. and Matos Figueiredo, D. and Mundim, L. and Nogima, and H. and Oguri, V. and Prado Da Silva, W. L. and Santoro, A. and Silva Do and Amaral, S. M. and Soares Jorge, L. and Sznajder, A. and Anjos, T. 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    journal = "The European Physical Journal C - Particles and Fields",
    year = "2012",
    volume = "72",
    number = "9",
    publisher = "Springer-Verlag",
    issn = "1434-6044, 1434-6052",
    doi = "10.1140/epjc/s10052-012-2080-4",
    abstract = "A measurement of the underlying event (UE) activity in proton-proton
collisions at a center-of-mass energy of 7 TeV is performed using
Drell-Yan events in a data sample corresponding to an integrated
luminosity of 2.2 fb(-1), collected by the CMS experiment at the LHC.
The activity measured in the muonic final state (q (q) over bar -> mu(+)
mu(-)) is corrected to the particle level and compared with the
predictions of various Monte Carlo generators and hadronization models.
The dependence of the UE activity on the dimuon invariant mass is well
described by PYTHIA and HERWIG++ tunes derived from the leading
jet/track approach, illustrating the universality of the UE activity.
The UE activity is observed to be independent of the dimuon invariant
mass in the region above 40 GeV/c(2), while a slow increase is observed
with increasing transverse momentum of the dimuon system. The dependence
of the UE activity on the transverse momentum of the dimuon system is
accurately described by MADGRAPH, which simulates multiple hard
emissions."
}