2012/01/31 by Mathias Butenschoen, Bernd A. Kniehl · 221 citations
Physics and Astronomy · #Algorithm #Computer science #Factorization #Fermilab #High-Energy Particle Collisions Research #Large Hadron Collider #Octet #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quark #Tevatron #hep-ex #hep-ph
paper · pdf · doi:10.1103/physrevlett.108.172002
published in Physical Review Letters 108(17), 172002 (American Physical Society) · 8 pages, 2 figures; minor changes to the text, 3 references added; accepted for publication in Physical Review Letters
arxiv created 2012/03/09 · openalex publication_date 2012/04/24 · arxiv updated 2015/06/03 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We study the polarization observables of J/ψ hadroproduction at next-to-leading order within the factorization formalism of nonrelativistic quantum chromodynamics. We complete the present knowledge of the relativistic corrections by also providing the contribution due to the intermediate (3)P(J)([8]) color-octet states at this order, which turns out to be quite significant. Exploiting the color-octet long-distance matrix elements previously extracted through a global fit to experimental data of unpolarized J/ψ production, we provide theoretical predictions in the helicity and Collins-Soper frames and compare them with data taken by CDF at Fermilab Tevatron I and II and by ALICE at CERN LHC. The notorious CDF J/ψ polarization anomaly familiar from leading-order analyses persists at the quantum level, while the situation looks promising for the LHC, which is bound to bring final clarification.