Igor Katkov (DESY)
The forward (HF) and very-forward (CASTOR) calorimeters of CMS are used to measure the density of energy per unit of pseudorapiditdy up to eta of 6.6 at 13TeV. The measurements are compared to model predictions. Furthermore, the corresponding data of transverse energy are compared to CMS measurements at lower center-of-mass energies, where all data are shifted by the beam rapidity. The result is a demonstration of limiting fragmentation in pp collisions over a wide range of energies.
Prof. COllaboration CMS (CINCO)