A measurement of the underlying activity in scattering processes with p (T) scale in the GeV region is performed in proton-proton collisions at root s = 0.9 TeV, using data collected by the CMS experiment at the LHC. Charged particle production is studied with reference to the direction of a leading object, either a charged particle or a set of charged particles forming a jet. Predictions of several QCD-inspired models as implemented in PYTHIA are compared, after full detector simulation, to the data. The models generally predict too little production of charged particles with pseudorapidity |eta|< 2, p (T) > 0.5 GeV/c, and azimuthal direction transverse to that of the leading object.
First measurement of the underlying event activity at the LHC with root s=0.9 TeV / Khachatryan, V., Sirunyan, A.m., Tumasyan, A., Adam, W., Bergauer, T., Dragicevic, M., Ero, J., Fabjan, C., Friedl, M., Fruhwirth, R., Ghete, V.m., Hammer, J., Hansel, S., Hoch, M., Hormann, N., Hrubec, J., Jeitler, M., Kasieczka, G., Kiesenhofer, W., Krammer, M., et al.. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - 70:(2010), pp. 555-572. [10.1140/epjc/s10052-010-1453-9]
First measurement of the underlying event activity at the LHC with root s=0.9 TeV
KHACHATRYAN V; SIRUNYAN AM; TUMASYAN A; ADAM W; BERGAUER T; DRAGICEVIC M; ERO J; FABJAN C; FRIEDL M; FRUHWIRTH R; GHETE VM; HAMMER J; HANSEL S; HOCH M; HORMANN N; HRUBEC J; JEITLER M; KASIECZKA G; KIESENHOFER W; KRAMMER M; LIKO D; MIKULEC I; PERNICKA M; ROHRINGER H; SCHOFBECK R; STRAUSS J; TAUROK A; TEISCHINGER F; WALTENBERGER W; WALZEL G; WIDL E; WULZ CE; MOSSOLOV V; SHUMEIKO N; GONZALEZ JS; BENUCCI L; CEARD L; DE WOLF EA; HASHEMI M; JANSSEN X; MAES T; MUCIBELLO L; OCHESANU S; ROLAND B; ROUGNY R; SELVAGGI M; VAN HAEVERMAET H; VAN MECHELEN P; VAN REMORTEL N; ADLER V; BEAUCERON S; BLYWEERT S; D'HONDT J; DEVROEDE O; KALOGEROPOULOS A; MAES J; MAES M; 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; COSTANTINI S; GRUNEWALD M; KLEIN B; MARINOV A; RYCKBOSCH D; THYSSEN F; TYTGAT M; VANELDEREN L; VERWILLIGEN P; WALSH S; ZAGANIDIS N; BASEGMEZ S; BRUNO G; CAUDRON J; 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2010
Abstract
A measurement of the underlying activity in scattering processes with p (T) scale in the GeV region is performed in proton-proton collisions at root s = 0.9 TeV, using data collected by the CMS experiment at the LHC. Charged particle production is studied with reference to the direction of a leading object, either a charged particle or a set of charged particles forming a jet. Predictions of several QCD-inspired models as implemented in PYTHIA are compared, after full detector simulation, to the data. The models generally predict too little production of charged particles with pseudorapidity |eta|< 2, p (T) > 0.5 GeV/c, and azimuthal direction transverse to that of the leading object.
Citazione
First measurement of the underlying event activity at the LHC with root s=0.9 TeV / Khachatryan, V., Sirunyan, A.m., Tumasyan, A., Adam, W., Bergauer, T., Dragicevic, M., Ero, J., Fabjan, C., Friedl, M., Fruhwirth, R., Ghete, V.m., Hammer, J., Hansel, S., Hoch, M., Hormann, N., Hrubec, J., Jeitler, M., Kasieczka, G., Kiesenhofer, W., Krammer, M., et al.. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - 70:(2010), pp. 555-572. [10.1140/epjc/s10052-010-1453-9]
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