Investigating RT using two-particle angular correlations in proton-proton collisions

Sammanfattning: The observable, RT , is investigated using two-dimensional (∆η, ∆φ) angular correlations, where ∆η and ∆φ are the differences in pseudorapidity and azimuthal angle respectively, between the trigger and associated tracks. The analysed data consists of reconstructed tracks, from proton-proton collisions at collision energy ps = 13 TeV, taken from the ALICE detector at the LHC. Correlations are constructed in three configurations, where the selection of trigger and associated tracks is changed. Analysis of the correlations imply that RT has high sensitivity to the underlying event, as well as a tendency to select event shapes with dominating back-toback jet fragmentation for low RT. A disappearance of the away-side peak in ∆φ-projections is observed in high RT events. We also see significant near-side correlations in all configurations, even within the transverse region.