Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-06-18
Phys.Rev.Lett. 89 (2002) 161802
Physics
High Energy Physics
High Energy Physics - Phenomenology
Asymmetry and sin^2 theta_eff statistical uncertainties corrected in this version. 10 pages, 2 ps figures, revtex
Scientific paper
10.1103/PhysRevLett.89.161802
We discuss forward-backward charge asymmetries for lepton pair production in association with a large transverse momentum jet at hadron colliders. The measurement of the lepton charge asymmetry relative to the jet direction A_{FB}^j gives a new determination of the effective weak mixing angle sin^2{\theta_{eff}^{lept}(M_Z^2)} with in principle a statistical precision after cuts of \sim 10^{-3} (8 x 10^{-3}) at LHC (Tevatron), due to the large cross section of the process with initial gluons. The identification of b jets also allows for the measurement of the bottom quark Z asymmetry A_{FB}^b at hadron colliders although with a lower precision than at LEP, the resulting statistical precision for sin^2{\theta_{eff}^{lept}(M_Z^2)} being \sim 9 x 10^{-4} (2 x 10^{-2} at Tevatron).
Aguila Del F.
Ametller Ll.
Talavera Pedro
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