Dihadron Azimuthal Correlation from Collins Effect in Unpolarized Hadron Collisions

Understand

We study the dihadron azimuthal correlation produced nearly back-to-back in unpolarized hadron collisions, arising from the product of two Collins fragmentation functions.

• Using the latest Collins fragmentation functions extracted from the global analysis of available experimental data, we make predictions for the azimuthal correlation of two-pion production in $pp$ collisions at RHIC energies.
• We find that the correlation is sizable in the mid-rapidity region for moderate jet transverse momentum.