Speaker
Description
Global observables such as the pseudorapidity distributions of particle multiplicities in the final state are crucial to shed light into the physics processes involved in hadronic collisions. In proton-lead (p-Pb) collisions at LHC energies, such measurements provide an important baseline to understand lead-lead (Pb-Pb) results by disentangling hot nuclear matter effects from cold nuclear matter effects. Multiplicity measurements can also put constraints on theoretical models describing the initial stages of the collision, e.g., to what degree the nucleon and the nuclei interact as dilute (partons) or dense (CGC-like) fields. The study of inclusive photon multiplicity aims to provide complementary measurements to those obtained with charged particles.
In this contribution, the multiplicity and pseudorapidity distributions of inclusive photons at forward rapidity (2.3 $<\eta<$ 3.9) in pp and p-Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV will be presented. The data samples have been collected using the Photon Multiplicity Detector (PMD) of ALICE. The dependence of photon production on centrality will be presented and compared both with charged-particle distributions measured at midrapidity and with predictions from Monte Carlo event generators.
| Session | Heavy Ions and QCD |
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