Measurement of the Forward-Backward Charge Asymmetry and Extraction of sin²Ө_W^eff in pp → Z/γ* +X → e⁺e^- + X Events Produced at √s = 1.96 TeV

Authors

V. M. Abazov, Joint Institute for Nuclear Research, Dubna, Russia
Kenneth A. Bloom, University of Nebraska-LincolnFollow
Gregory Snow, University of Nebraska-LincolnFollow
D0 Collaboration

Document Type

Article

Date of this Version

11-7-2008

Comments

Published in PHYSICAL REVIEW LETTERS 101, 191801 (2008). Copyright © 2008 The American Physical Society. Used by permission.

Abstract

We present a measurement of the forward-backward charge asymmetry (A_FB) in pp → Z/γ* +X → e⁺e^- + X events at a center-of-mass energy of 1.96 TeV using 1.1 fb^-1 of data collected with the D0 detector at the Fermilab Tevatron collider. AFB is measured as a function of the invariant mass of the electron-positron pair, and found to be consistent with the standard model prediction. We use the AFB measurement to extract the effective weak mixing angle sin²Ө_W^eff = 0.2326 ± 0.0018 (stat) ± 0.0006 (syst).