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Paper   IPM / Particles / 11485
School of Particles and Accelerator
  Title:   Measurement of the Underlying Event Activity in Proton-Proton Collisions at 0.9 TeV
  Author(s): 
1.  Hessamaddin Arfaei
2.  Hamed Bakhshiansohi
3.  Ali Fahim
4.  Abideh Jafari
5.  Mojtaba Mohammadi Najafabadi
6.  Saeid Paktinat
7.  Batool Safarzadeh
8.  Maryam Zeinali
  Status:   Published
  Journal:
  Year:  2010
  Supported by:  IPM
  Abstract:
A measurement of the underlying activity in scattering processes with transverse momentum scale in the GeV region is performed in proton-proton collisions at sqrt(s) = 0.9 TeV, using data collected by the CMS experiment at the LHC. Charged hadron 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 hadrons with pseudorapidity eta < 2, p_T > 0.5 GeV/c, and azimuthal direction transverse to that of the leading object.

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