2008/05/31 by Zhun Lu, Zhun Lü, Iván Schmidt +1
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1103/physrevd.78.034041
published as Phys.Rev.D78:034041,2008 · 10 pages, 7 figures, version accepted by Physical Review D
openalex publication_date 2008/08/29 · arxiv created 2008/09/08 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We study the azimuthal angular dependence of back-to-back dijet production in unpolarized hadron scattering HA+HB\ensuremath→J1+J2+X, arising from the product of two Boer-Mulders functions, which describe the transverse spin distribution of quarks inside an unpolarized hadron. We find that when the dijet is of two identical quarks (Jq+Jq) or a quark-antiquark pair (Jq+J_q), there is a cos\ensuremathδ\ensuremathφ angular dependence of the dijet, with \ensuremathδ\ensuremathφ=\ensuremathφ1\ensuremath-\ensuremathφ2, and \ensuremathφ1 and \ensuremathφ2 are the azimuthal angles of the two individual jets. In the case of Jq+Jq production, we find that there is a color factor enhancement in the gluonic cross section, compared with the result from the standard generalized parton model. We estimate the cos\ensuremathδ\ensuremathφ asymmetry of dijet production at RHIC, showing that the color factor enhancement in the angular dependence of Jq+Jq production will reverse the sign of the asymmetry.