First measurement of the underlying event activity at the LHC with root s=0.9 TeV


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Khachatryan V., Sirunyan A. M. , Tumasyan A., Adam W., Bergauer T., Dragicevic M., ...Daha Fazla

EUROPEAN PHYSICAL JOURNAL C, cilt.70, ss.555-572, 2010 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 70 Konu: 3
  • Basım Tarihi: 2010
  • Doi Numarası: 10.1140/epjc/s10052-010-1453-9
  • Dergi Adı: EUROPEAN PHYSICAL JOURNAL C
  • Sayfa Sayıları: ss.555-572

Özet

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.