@article{3148229, title = "Charged particle multiplicities in pp interactions at root s=0:9, 2:36, and 7 TeV", author = "Khachatryan, V. and Sirunyan, A. M. and Tumasyan, A. and Adam, W. and and Bergauer, T. and Dragicevic, M. and Eroe, J. and Fabjan, C. and Friedl, and M. and Fruehwirth, R. and Ghete, V. M. and Hammer, J. and Haensel, S. and and Hartl, C. and Hoch, M. and Hoermann, N. and Hrubec, J. and Jeitler, and M. and Kasieczka, G. 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 Waltenberger, W. and and Walzel, G. and Widl, E. and Wulz, C. -E. and Mossolov, V. and and Shumeiko, N. and Gonzalez, J. Suarez and Benucci, L. and Ceard, L. and and Cerny, K. and De Wolf, E. 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Y. and Rodenburg, M. and Williams, G. and Adam, N. and and Berry, E. and Elmer, P. and Gerbaudo, D. and Halyo, V. and Hebda, P. and and Hunt, A. and Jones, J. and Laird, E. and Pegna, D. Lopes and Marlow, D. and and Medvedeva, T. and Mooney, M. and Olsen, J. and Piroue, P. and Quan, and X. and Saka, H. and Stickland, D. and Tully, C. and Werner, J. S. and and Zuranski, A. and Acosta, J. G. and Huang, X. T. and Lopez, A. and and Mendez, H. and Oliveros, S. and Vargas, J. E. Ramirez and Zatserklyaniy, and A. and Alagoz, E. and Barnes, V. E. and Bolla, G. and Borrello, L. and and Bortoletto, D. and Everett, A. and Garfinkel, A. F. and Gecse, Z. and and Gutay, L. and Jones, M. and Koybasi, O. and Laasanen, A. T. and and Leonardo, N. and Liu, C. and Maroussov, V. and Merkel, P. and Miller, D. and H. and Neumeister, N. and Potamianos, K. and Shipsey, I. and Silvers, D. and and Svyatkovskiy, A. and Yoo, H. 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C. and and Orbaker, D. and Petrillo, G. and Vishnevskiy, D. and Zielinski, M. and and Bhatti, A. and Demortier, L. and Goulianos, K. and Lungu, G. and and Mesropian, C. and Yan, M. and Atramentov, O. and Barker, A. and Duggan, and D. and Gershtein, Y. and Gray, R. and Halkiadakis, E. and Hidas, D. and and Hits, D. and Lath, A. and Panwalkar, S. and Patel, R. and Richards, A. and and Rose, K. and Schnetzer, S. and Somalwar, S. and Stone, R. and and Thomas, S. and Cerizza, G. and Hollingsworth, M. and Spanier, S. and and Yang, Z. C. and York, A. and Asaadi, J. and Eusebi, R. and Gilmore, J. and and Gurrola, A. and Kamon, T. and Khotilovich, V. and Montalvo, R. and and Nguyen, C. N. and Pivarski, J. and Safonov, A. and Sengupta, S. and and Tatarinov, A. and Toback, D. and Weinberger, M. and Akchurin, N. and and Bardak, C. and Damgov, J. and Jeong, C. and Kovitanggoon, K. and Lee, S. and W. and Mane, P. and Roh, Y. and Sill, A. and Volobouev, I. and Wigmans, and R. and Yazgan, E. and Appelt, E. and Brownson, E. and Engh, D. and and Florez, C. and Gabella, W. and Johns, W. and Kurt, P. and Maguire, C. and and Melo, A. and Sheldon, P. and Velkovska, J. and Arenton, M. W. and and Balazs, M. and Boutle, S. and Buehler, M. and Conetti, S. and Cox, B. and and Francis, B. and Hirosky, R. and Ledovskoy, A. and Lin, C. and Neu, and C. and Yohay, R. and Gollapinni, S. and Harr, R. and Karchin, P. E. and and Mattson, M. and Milstene, C. and Sakharov, A. and Anderson, M. and and Bachtis, M. and Bellinger, J. N. and Carlsmith, D. and Dasu, S. and and Efron, J. and Gray, L. and Grogg, K. S. and Grothe, M. and Hall-Wilton, and R. and Herndon, M. and Klabbers, P. and Klukas, J. and Lanaro, A. and and Lazaridis, C. and Leonard, J. and Lomidze, D. and Loveless, R. and and Mohapatra, A. and Parker, W. and Reeder, D. and Ross, I. and Savin, A. and and Smith, W. H. and Swanson, J. and Weinberg, M. and CMS Collaboration", journal = "Journal of High Energy Physics", year = "2011", number = "1", publisher = "Springer-Verlag", issn = "1126-6708, 1029-8479", doi = "10.1007/JHEP01(2011)079", keywords = "Hadron-Hadron Scattering", abstract = "Measurements of primary charged hadron multiplicity distributions are presented for non-single-diffractive events in proton-proton collisions at centre-of-mass energies of root s = 0.9, 2.36, and 7 TeV, in five pseudorapidity ranges from vertical bar eta vertical bar < 0.5 to vertical bar eta vertical bar < 2.4. The data were collected with the minimum-bias trigger of the CMS experiment during the LHC commissioning runs in 2009 and the 7 TeV run in 2010. The multiplicity distribution at root s - 0.9 TeV is in agreement with previous measurements. At higher energies the increase of the mean multiplicity with root s is underestimated by most event generators. The average transverse momentum as a function of the multiplicity is also presented. The measurement of higher-order moments of the multiplicity distribution con firms the violation of Koba-Nielsen-Olesen scaling that has been observed at lower energies." }