Emerging picture of hard scattering phenomena in p + p collisions at image in ALICE

In the first LHC 2009 and 2010 runs the ALICE experiment collected about 10 image at image and more than 20 image at image bench for the pQCD description of hard scattering phenomena at the highest center of mass energy p + p collisions ever recorded. These data are used to study the universality of the charged hadron invariant yields measured by the ALICE experiment in terms of image scaling. Leading particle associated yield is used to study the angular correlations. A comparison of per-trigger yield in image and image data samples is presented. An increasing role of the soft QCD radiation is deduced from the slope of the associated particle yield in the region perpendicular to the leading particle.