2002/06/30 by F. del Águila, F. del Aguila, Ll. Ametller +2 · 1 citation
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle Detector Development and Performance #Particle physics theoretical and experimental studies #hep-ex #hep-ph
paper · pdf · doi:10.1103/physrevlett.89.161802
published as Phys.Rev.Lett. 89 (2002) 161802 · Asymmetry and sin^2 theta_eff statistical uncertainties corrected in this version. 10 pages, 2 ps figures, revtex
arxiv created 2002/07/30 · openalex publication_date 2002/10/01 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/02
We discuss forward-backward charge asymmetries for lepton-pair production in association with a large-transverse-momentum jet at hadron colliders. The lepton charge asymmetry relative to the jet direction AFBj gives a new determination of the effective weak mixing angle sin2\ensuremathθefflept(MZ2) with a statistical precision after cuts of \ensuremath∼10^\ensuremath-3 (8\ifmmode×\else\texttimes\fi10^\ensuremath-3) at LHC (Tevatron). This is to be compared with the current uncertainty at LEP and SLD from the asymmetries alone, 2\ifmmode×\else\texttimes\fi10^\ensuremath-4. The identification of b jets also allows for the measurement of the bottom-quark--Z asymmetry AFBb at hadron colliders, the resulting statistical precision for sin2\ensuremathθefflept(MZ2) being \ensuremath∼9\ifmmode×\else\texttimes\fi10^\ensuremath-4 (2\ifmmode×\else\texttimes\fi10^\ensuremath-2 at Tevatron), also lower than the reported precision at e+e^\ensuremath- colliders, 3\ifmmode×\else\texttimes\fi10^\ensuremath-4.