Shedding light on pp and p--Pb collisions through forward energy detection

17 Nov 2022, 15:20
WG3: High Multiplicities (small systems) W3 + W5 Common Session


Chiara Oppedisano (INFN Torino)


The very forward energy, measured at large rapidities, is a powerful tool for characterising proton fragmentation in pp and p–Pb collisions. The correlation of forward energy with particle production at midrapidity gives direct insights into the initial stages of high-energy hadronic collisions.
The forward energy can also be studied in relation with the large transverse momentum particles produced at midrapidity. Such studies complement the measurements of the underlying event, usually interpreted in the framework of models implementing centrality-dependent multiple parton interaction.

Results about the correlation between the very forward energy and particle production at midrapidity in pp collisions at $\sqrt{s}$ = 13 TeV and in p-Pb collisions at $\sqrt{s_{\rm NN}}$ = 8.16 TeV, measured with the ALICE detector, will be discussed.

Finally, these results will be compared with expectations of hadronic interaction event generators, such as PYTHIA and EPOS, to test the models capability in describing both the multi-parton-interaction-dependent UE and the forward fragmentation, observables mainly driven by non-perturbative QCD physics.

Primary author

Chiara Oppedisano (INFN Torino)

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