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Paper
IPM / Particles And Accelerator / 11485 |
School of Particles and Accelerator
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Title: |
Measurement of the Underlying Event Activity in Proton-Proton Collisions at 0.9 TeV
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Author(s): |
| 1 . |
Hessamaddin Arfaei
| | 2 . |
Hamed Bakhshiansohi
| | 3 . |
Ali Fahim
| | 4 . |
Abideh Jafari
| | 5 . |
Mojtaba Mohammadi Najafabadi
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Saeid Paktinat
| | 7 . |
Batool Safarzadeh
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Maryam Zeinali
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Status: |
Published
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Journal: |
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Year: |
2010
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Supported by: |
IPM
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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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