Soft and hard components of two-particle distributions on ( y t ,η,ϕ ) from p-p collisions at s √ =200 GeV
Abstract
We report measurements of large-scale two-particle correlations for 200 GeV p-p collisions on momentum components transverse rapidity
y
t
(pion mass assigned), pseudorapidity
η
and azimuth angle
ϕ
. In both transverse
y
t
⊗
y
t
and axial
(η⊗η,ϕ⊗ϕ)
two-particle subspaces we observe two components of correlation structure (soft and hard) which we interpret respectively in terms of longitudinal string fragmentation and transverse minimum-bias parton fragmentation (minijets). This combination is also represented by Lund-model-based Monte Carlo simulations such as Pythia.