Soft QCD Results from CMS

Abstract

Studies of hadron production in proton-proton collisions, including charged particle transverse momentum, pseudo-rapidity and event-by-event multiplicity distributions at \sqrt{s} = 0.9, 2.36 and 7 TeV are shown. Measured spectra of identified strange hadrons, reconstructed based on their decay topology, are also presented. Comparisons to several QCD Monte Carlo models and tunes are discussed. Results on two-particle angular correlations over a broad range of pseudo-rapidity and azimuthal angle in p-p collisions are presented at both \sqrt{s} = 0.9 and 7 TeV. In high multiplicity events, a pronounced structure emerges in the two-dimensional correlation function for particle pairs with intermediate transverse momentum of 1-3 GeV/c. Furthermore, Bose-Einstein correlations between identical particles are measured in samples of proton-proton collisions at \sqrt{s} =0.9 and 7 TeV. Finally, a measurement of the underlying activity in scattering processes with a p_T scale in the several GeV region is also presented.

4 pages, Contribution to the proceedings of EPS-HEP 2011 Conference, Grenoble, Rhône-Alpes, France, July 21-27, 2011

References in corpus (7)

• PYTHIA 6.4 Physics and Manual
• Observation of Long-Range Near-Side Angular Correlations in Proton-Proton Collisions at the LHC
• Strange Particle Production in pp Collisions at sqrt(s) = 0.9 and 7 TeV
• Charged particle transverse momentum spectra in pp collisions at sqrt(s) = 0.9 and 7 TeV
• Transverse nucleon structure and diagnostics of hard parton-parton processes at LHC
• Measurement of the Underlying Event Activity in Proton-Proton Collisions at 0.9 TeV
• Measurement of Bose-Einstein Correlations in pp Collisions at sqrt(s)=0.9 and 7 TeV