@article{3145070, title = "Transverse-momentum and pseudorapidity distributions of charged hadrons in pp collisions at root s=0.9 and 2.36 TeV", author = "Khachatryan, V. and Sirunyan, A. M. and Tumasyan, A. and Adam, W. and and Bergauer, T. and Dragicevic, M. and Ero, J. and Friedl, M. and and Fruehwirth, R. and Ghete, V. M. and Hammer, J. and Haensel, S. and Hoch, and M. and Hoermann, N. and Hrubec, J. and Jeitler, M. and Kasieczka, G. and and Krammer, M. and Liko, D. and Mikulec, I. and Pernicka, M. and Rohringer, and H. and Schoefbeck, R. and Strauss, J. and Taurok, A. and Teischinger, F. 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 Benucci, L. and and De Wolf, E. 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H. and Swanson, J. and Weinberg, M. and CMS Collaboration", journal = "Journal of High Energy Physics", year = "2010", number = "2", publisher = "Springer-Verlag", issn = "1126-6708, 1029-8479", doi = "10.1007/JHEP02(2010)041", keywords = "Hadron-Hadron Scattering", abstract = "Measurements of inclusive charged-hadron transverse-momentum and pseudorapidity distributions are presented for proton-proton collisions at root s = 0.9 and 2.36 TeV. The data were collected with the CMS detector during the LHC commissioning in December 2009. For non-single-diffractive interactions, the average charged-hadron transverse momentum is measured to be 0.46 +/- 0.01 (stat.) +/- 0.01 (syst.) GeV/c at 0.9 TeV and 0.50 +/- 0.01 (stat.) +/- 0.01 (syst.) GeV/c at 2.36 TeV, for pseudorapidities between -2.4 and +2.4. At these energies, the measured pseudorapidity densities in the central region, dN(ch)/d eta vertical bar(vertical bar eta vertical bar<0.5), are 3.48 +/- 0.02 (stat.) +/- 0.13 (syst.) and 4.47 +/- 0.04 (stat.) +/- 0.16 (syst.), respectively. The results at 0.9 TeV are in agreement with previous measurements and confirm the expectation of near equal hadron production in p<(p)over bar> and pp collisions. The results at 2.36 TeV represent the highest-energy measurements at a particle collider to date." }