Search for Pair Production of Light Scalar Top Quarks 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

7-2-2004

Comments

Published by American Physical Society. Phys. Rev. Lett. VOLUME 93, NUMBER 1 (2004). http://prl.aps.org. Copyright © 2004 American Physical Society. Used by permission.

Abstract

Using 85.2 ± 3.6 pb¹ of pp̅ collisions collected at √s = 1.8 TeV with the D0 detector at Fermilab’s Tevatron Collider, we present the results of a search for direct pair production of scalar top quarks (t̃), the supersymmetric partners of the top quark. We examined events containing two or more jets and missing transverse energy, the signature of light scalar top quark decays to charm quarks and neutralinos. After selections, we observe 27 events while expecting 31.1 ± 6.4 events from known standard model processes. Comparing these results to next-to-leading-order production cross sections, we exclude a significant region of t̃ and neutralino phase space. In particular, we exclude the t̃ mass m_t̃ < 122 GeV/c² for a neutralino mass of 45 GeV/c².