Speaker
Description
At high energy collisions, such as those achieved at the LHC, particle production is dominated by soft-QCD processes. The soft production is described by non-perturbative QCD and challenges existing phenomenological models. Global observables such as multiplicity and rapidity dependence of particle production are some of the most fundamental measurements for improving and constraining these models.
In this talk, we will present the multiplicity and pseudorapidity distributions of inclusive photons and charged particles at forward rapidities in p-Pb collisions at $\sqrt{s\rm_{NN}}$ = 5.02 TeV. The Photon Multiplicity Detector measures photon production within 2.3 < $\eta$ < 3.9. The Silicon Pixel Detector and the Forward Multiplicity Detector together measure charged particles over a wide range of -3.4 < $\eta$ < 5.0. Results on centrality evolution of particle production in p-Pb collisions will be presented both for photons and charged particles in comparison with phenomenological models (such as HIJING, DPMJET) based on different initial conditions and particle production mechanisms.
