Research Papers in Physics and Astronomy


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Published by American Physical Society. Phys. Rev. Lett. VOLUME 93, NUMBER 1 (2004). Copyright © 2004 American Physical Society. Used by permission.


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 (), 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 and neutralino phase space. In particular, we exclude the mass m < 122 GeV/c2 for a neutralino mass of 45 GeV/c2.

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