First measurement of the underlying event activity at the LHC with \sqrt{s} = 0.9 TeV

Abstract

A measurement of the underlying activity in scattering processes with p T scale in the GeV region is performed in proton–proton collisions at root s = 0.9 TeV, using data collected by the CMS experiment at the LHC. Charged particle production is studied with reference to the direction of a leading object, either a charged parti

Keywords

• CMS
• p p: interaction
• Hadron hadroproduction
• Jet hadroproduction
• Transverse momentum
• Momentum spectrum teleskope.