Abstract
Minijets provide useful information on parton interactions in the low transverse-momentum (low-pT) region. Because minijets produce clusters, we study the clustering properties of produced particles in high-energy pp collisions as a first step to identify minijets. We develop an algorithm to find clusters by using the k-means clustering method, in conjunction with a k-number (cluster number) selection principle in the space of pseudorapidity and azimuthal angles. We test the clustering algorithm using events generated by pythia8.1 for pp collision at √s=200 GeV. We find that clustering of low-pT hadrons occurs in high multiplicity events. However, similar clustering properties are also present for particles produced randomly in a finite pseudorapidity and azimuthal angle space. To distinguish the dynamics from random generations of events, it is necessary to examine the correlation between particles and between clusters. We find that the correlations between clusters may provide a useful tool to distinguish the underlying dynamics of the reaction mechanism.
