# EPS-HEP2021 conference

26-30 July 2021
Zoom
Europe/Berlin timezone

## Particle production at midrapidity in correlation with the very forward energy in pp and p-Pb collisions with ALICE ZDC

28 Jul 2021, 10:30
15m
Zoom

#### Zoom

Parallel session talk QCD and Hadronic Physics

### Speaker

Chiara Oppedisano

### Description

The very forward energy detected by the ALICE Zero Degree Calorimeters (ZDC) measures the beam remnants, whose energy decreases as the activity at midrapidity increases. A pseudorapidity gap of nearly 9 units between the ZDC ensures that any correlation between the very forward energy and the midrapidity production originates in the initial scatterings. The measurement of these correlations, done for the first time at LHC energies, provides direct insights into particle production and the initial stages of the collisions. The energy detected in the zero-degree hadronic calorimeters in pp collisions at $\sqrt{s}$ = 13 TeV and in p-Pb collisions at $\sqrt{s_{NN}}$ = 8.16 TeV will be presented and compared with the expectations of several hadronic interaction models. Underlying event (UE) measurements give insight into models implementing impact-parameter dependent multiparton interaction (MPI) production. The novel measurement of the relation between very forward energy and production of large transverse momentum particles at midrapidity provides complementary information to UE analysis.

Collaboration / Activity ALICE