\Delta\eta\Delta\phi\ angular correlations in pp collisions at the LHC registered by the ALICE experiment

TL;DR

This paper analyzes two-particle angular correlations in proton-proton collisions at various energies using ALICE data, revealing structures linked to different physics mechanisms and emphasizing the importance of minijet contributions in femtoscopic analyses.

Contribution

It provides detailed measurements of eltataelta correlations at multiple energies and explores their dependence on event properties, highlighting the role of minijets in correlation structures.

Findings

Correlation structures vary with energy, multiplicity, and charge.

Minijet effects are significant in femtoscopic correlation analyses.

Results improve understanding of underlying physics mechanisms in pp collisions.

Abstract

We report on studies of two-particle \Delta\eta\Delta\phi\ angular correlations measured in proton-proton collisions at center of mass energies sqrt{s} = 0.9 TeV, sqrt{s} = 2.76 TeV and sqrt{s} = 7 TeV registered by the ALICE experiment at LHC. We present the dependence of the correlation function on the pair transverse momentum, the multiplicity of the event and the charge combination of particles in the pair. \Delta\eta\Delta\phi correlations are expected to exhibit several structures which arise from different physics mechanisms. The results are also related to the correlations obtained by femtoscopic analysis. We show that the minijet hypothesis for the non-femtoscopic underlying correlation should be taken into account while performing the femtoscopy analysis.