Underlying Event Studies at LHC with CMS Detector(Soft Interaction and Multiparticle Correlations,Multiparticle Dynamics)

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概要

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• A measurement of the underlying activity in scattering processes with a p_T scale in the several GeV/c region is performed in proton-proton collisions at √<S>=7 TeV, using data collected by the CMS experiment at the LHC. The production of charged particles with pseudo-rapidity |η| < 2 and p_T > 0.5 GeV/c is studied in the azimuthal region transverse to that of the leading set of charged particles forming a "track-jet". A significant growth of the average multiplicity and scalar p_T sum of those particles is observed with increasing p_T of the leading track-jet, followed by saturation above a few GeV/c. A hardening of the multiplicity distribution, of the scalar p_T sum distribution, and of the charged particle p_T spectrum is also observed. For track-jet p_T larger than a few GeV/c, the activity in the transverse region is approximately doubled with a centre-of-mass energy increase from 0.9 to 7 TeV. Predictions of several QCD-inspired models as implemented in PYTHIA are compared to the unfolded data.

• 2012-04-27

著者

• Chao Yuan

  Physics Department National Taiwan University

• CHAO Yuan

  Physics Department, National Taiwan University

関連論文

• Underlying Event Studies at LHC with CMS Detector(Soft Interaction and Multiparticle Correlations,Multiparticle Dynamics)

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