Scaling properties of jet structures

We studied the structure of jets in proton-proton collisions at LHC energies using Monte Carlo simulations. We demonstrate that the radial jet profiles exhibit scaling properties with charged- hadron event multiplicity over a broad transverse-momentum range. Based on statistically motivated parametrizations of the jet profiles, we proposed that the scaling behavior stems from fundamental statistical properties of jet fragmentation [9]. We also observed that the charged-hadron multiplicity distributions scale with jet momentum (Fig. 1). This suggests that the Koba–Nielsen–Olesen (KNO) scaling holds within a jet. The in-jet scaling is fulfilled without MPI, but breaks down in case MPI is present without color reconnection. Our findings imply that KNO scaling is violated by parton shower or multiple-parton interactions in higher-energy collisions [10].