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October 20, 2025Open Access

Charged-particle production in pp collisions at 13.6 TeV and Pb-Pb collisions at 5.36 TeV with ALICE

Key Points

The first measurements of charged-particle pseudorapidity density were conducted in pp collisions at 13.6 TeV.
In Pb-Pb collisions, data were collected across centrality classes, highlighting various collision dynamics.
Using the upgraded ALICE detector, measurements were obtained at both midrapidity and forward pseudorapidity.
These findings provide insights into particle production mechanisms in high-energy collisions.

Abstract

The first measurements of the charged-particle pseudorapidity density, dN₂₇/ dη, in proton-proton (pp) collisions at s = 13. 6 TeV and in lead-lead (Pb-Pb) collisions at s₍₍ = 5. 36 TeV are presented. The analysis is based on Run 3 data recorded in 2022 and 2023, using the upgraded ALICE detector at the LHC. The average charged-particle pseudorapidity density dN₂₇/ dη in pp collisions was measured at midrapidity (|η|<0. 5) with the upgraded central barrel detectors, such as the Inner Tracking System and the Time Projection Chamber and, at forward pseudorapidity (-3. 6 <|η|<- 2. 4), using the newly installed Muon Forward Tracker (MFT). For Pb-Pb collisions, the measurement was performed in different centrality classes, ranging from the most central 0-5\%) to the peripheral (70-80\%) collisions.

Charged-particle production in pp collisions at 13.6 TeV and Pb-Pb collisions at 5.36 TeV with ALICE

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