2005/09/30 by Stefano Moretti, S. Moretti, M. R. Nolten +3
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1016/j.physletb.2006.06.084
published as Phys.Lett.B643:86-92,2006 · 12 pages, 4 figures, 2 tables, minor modifications, version to appear in PLB
arxiv created 2006/06/20 · openalex publication_date 2006/11/03 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/31
We report on a calculation of the full one-loop weak corrections through the order αS2αW to parton–parton scattering in all possible channels at the Relativistic Heavy Ion Collider (RHIC) running with polarised pp beams (RHIC-Spin). This study extends the analysis previously carried out for the case of 2→2 subprocesses with two external gluons, by including all possible four-quark modes with and without an external gluon. The additional contributions due to the new four-quarks processes are extremely large, of order 50 to 100% (of either sign), not only in the case of parity-violating beam asymmetries but also for the parity-conserving ones and (although to a more limited extent) the total cross section. Such O(αS2αW) effects on the CP-violating observables would be an astounding 5 times larger for the case of the LHC with polarised beams—which has been discussed as one of the possible upgrades of the CERN machine—whereas they would be much reduced for the case of the CP-conserving ones as well as the cross section.