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Browsing Journal Articles by Subject "0206 Quantum Physics"

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    Transverse-momentum and pseudorapidity distributions of charged hadrons in pp collisions at √s = 0.9 and 2.36TeV
    (SPRINGER, 1/01/2010) Khachatryan V; Sirunyan AM; Tumasyan A; Adam W; Bergauer T; Dragicevic M; Erö J; Friedl M; Frühwirth R; Ghete VM; Hammer J; Hänsel S; Hoch M; Hörmann N; Hrubec J; Jeitler M; Kasieczka G; Krammer M; Liko D; Mikulec I; Pernicka M; Rohringer H; Schöfbeck R; Strauss J; Taurok A; Teischinger F; Waltenberger W; Walzel G; Widl E; Wulz CE; Mossolov V; Shumeiko N; Suarez Gonzalez J; Benucci L; De Wolf EA; Hashemi M; Janssen X; Maes T; Mucibello L; Ochesanu S; Rougny R; Selvaggi M; Van Haevermaet H; Van Mechelen P; Van Remortel N; Adler V; Beauceron S; D’Hondt J; Devroede O; Kalogeropoulos A; Maes J; Mozer MU; Tavernier S; Van Doninck W; Van Mulders P; Villella I; Chabert EC; Charaf O; Clerbaux B; De Lentdecker G; Dero V; Gay APR; Hammad GH; Marage PE; Vander Velde C; Vanlaer P; Wickens J; Grunewald M; Klein B; Marinov A; Ryckbosch D; Thyssen F; Tytgat M; Vanelderen L; Verwilligen P; Walsh S; Basegmez S; Bruno G; Caudron J; Cortina Gil E; De Favereau De Jeneret J; Delaere C; Demin P; Favart D; Giammanco A; Grégoire G; Hollar J; Lemaitre V; Maltoni F; Militaru O; Ovyn S; Piotrzkowski K; Quertenmont L; Schul N; Beliy N; Caebergs T; Daubie E; Herquet P; Alves GA; Pol ME
    Measurements of inclusive charged-hadron transverse-momentum and pseudorapidity distributions are presented for proton-proton collisions at √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, dNch/dη| |η|>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 con- firm the expectation of near equal hadron production in pp̄ and pp collisions. The results at 2.36 TeV represent the highest-energy measurements at a particle collider to date.