@article{3152203,
    title = "Forward energy flow, central charged-particle multiplicities, and
pseudorapidity gaps in W and Z boson events from pp 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 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 Rahbaran, B. and Rohringer, H. and and Schoefbeck, R. and Strauss, J. and Taurok, A. and Teischinger, F. and and Trauner, C. and Wagner, P. and Waltenberger, W. and Walzel, G. and Widl, and E. and Wulz, C. -E. and Mossolov, V. and Shumeiko, N. and Gonzalez, J. and Suarez and Bansal, S. and Benucci, L. and De Wolf, E. A. and Janssen, X. and and Maes, T. and Mucibello, L. and Ochesanu, S. and Roland, B. and and Rougny, R. and Selvaggi, M. and Van Haevermaet, H. and Van Mechelen, P. and and Van Remortel, N. and Blekman, F. and Blyweert, S. and D'Hondt, J. and and Devroede, O. and Suarez, R. Gonzalez and Kalogeropoulos, A. and and Maes, M. 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 and Marage, P. E. and Raval, A. and Thomas, L. and Vander Marcken, G. and and Vander Velde, C. and Vanlaer, P. and Adler, V. and Cimmino, A. and and Costantini, S. and Grunewald, M. and Klein, B. and Lellouch, J. and and Marinov, A. and Mccartin, J. and Ryckbosch, D. and Thyssen, F. and and Tytgat, M. and Vanelderen, L. and Verwilligen, P. and Walsh, S. and and Zaganidis, N. and Basegmez, S. and Bruno, G. and Caudron, J. and Ceard, and L. and Gil, E. 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S. and Grothe, M. and and Hall-Wilton, R. and Herndon, M. and Herve, A. and Klabbers, P. and and Klukas, J. and Lanaro, A. and Lazaridis, C. and Leonard, J. and and Loveless, R. and Mohapatra, A. and Ojalvo, I. and Parker, W. and Reeder, and D. and Ross, I. and Savin, A. and Smith, W. H. and Swanson, J. and and Weinberg, M. and CMS Collaboration",
    journal = "The European Physical Journal C - Particles and Fields",
    year = "2012",
    volume = "72",
    number = "1",
    publisher = "Springer-Verlag",
    issn = "1434-6044, 1434-6052",
    doi = "10.1140/epjc/s10052-011-1839-3",
    abstract = "A study of forward energy flow and central charged-particle multiplicity
in events with W and Z bosons decaying into leptons is presented. The
analysis uses a sample of 7 TeV pp collisions, corresponding to an
integrated luminosity of 36 pb(-1), recorded by the CMS experiment at
the LHC. The observed forward energy depositions, their correlations,
and the central charged-particle multiplicities are not well described
by the available non-diffractive soft-hadron production models. A study
of about 300 events with no significant energy deposited in one of the
forward calorimeters, corresponding to a pseudorapidity gap of at least
1.9 units, is also presented. An indication for a diffractive component
in these events comes from the observation that the majority of the
charged leptons from the W(Z) decays are found in the hemisphere
opposite to the gap. When fitting the signed lepton pseudorapidity
distribution of these events with predicted distributions from an
admixture of diffractive (POMPYT) and non-diffractive (PYTHIA) Monte
Carlo simulations, the diffractive component is determined to be (50.0
+/- 9.3 (stat.) +/- 5.2 (syst.))%."
}