Measurement of the Underlying Event Activity for p-p collisions with √s = 7 TeV and 0.9 TeV at CMS

Details Measurement of the Underlying Event Activity for p-p collisions with √s = 7 TeV and 0.9 TeV at CMS Measurement of the Underlying Event Activity for p-p collisions with √s = 7 TeV and 0.9 TeV at CMS

Mar 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aps..aprr10004z&link_type=abstract

American Physical Society, APS April Meeting 2012, March 31-Apr 3, 2012, abstract #R10.004

Physics

Scientific paper

A measurement of the underlying activity in scattering processes with a pT scale of several GeV/c is performed on proton-proton collisions at √s = 7 TeV and 0.9 TeV using corrected data collected by the CMS experiment at the LHC. The production of charged particles is studied with reference to the azimuthal direction of the leading track with |η| < 0.8 and pT> 0.5 GeV/c. A significant increase of the average number of charged particles and of the average scalar σpT is observed followed by a saturation at large values of the pT scale. A significant growth of the activity in the transverse region is observed when increasing the energy from √s = 0.9 TeV to √s = 7 TeV. Various PYTHIA based QCD-inspired models are compared with the data after full detector simulation.

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