Search for Narrow tt̅ Resonances in pp̅ Collisions at √s = 1.8 TeV

Authors

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

Date of this Version

6-4-2004

Comments

Published by American Physical Society. Phys. Rev. Lett. VOLUME 92, NUMBER 22(2004). http://prl.aps.org. Copyright © 2004 American Physical Society. Used by permission.

Abstract

A search for narrow resonances that decay into tt̅ pairs has been performed using 130 pb^-1 of data in the lepton + jets channel collected by the DØ detector in pp̅ collisions at √s = 1.8 TeV. There is no significant deviation observed from the standard-model predictions at a top-quark mass of 175 GeV/c². We therefore present upper limits at the 95% confidence level on the product of the production cross section and branching fraction to tt̅ for narrow resonances as a function of the resonance mass M_x. These limits are used to exclude the existence of a leptophobic top-color particle with mass M_x < 560 GeV/c², using a theoretical cross section for a width Γ_x = 0.012M_x.