Direct measurement of the top quark mass by the DØ Collaboration

B. Abbott et al. (DØ Collaboration)
Phys. Rev. D 58, 052001 – Published 23 July 1998
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Abstract

We determine the top quark mass mt using tt¯ pairs produced in the DØ detector by s=1.8TeV pp¯ collisions in a 125pb1 exposure at the Fermilab Tevatron. We make a two constraint fit to mt in tt¯bW+b¯W final states with one W boson decaying to qq¯ and the other to eν or μν. Likelihood fits to the data yield mt(l+jets)=173.3±5.6(stat)±5.5(syst)GeV/c2. When this result is combined with an analysis of events in which both W bosons decay into leptons, we obtain mt=172.1±5.2(stat)±4.9(syst)GeV/c2. An alternate analysis, using three constraint fits to fixed top quark masses, gives mt(l+jets)=176.0±7.9(stat)±4.8(syst)GeV/c2, consistent with the above result. Studies of kinematic distributions of the top quark candidates are also presented. 14.65.Ha, 13.85.Ni, 13.85.Qk

  • Received 27 January 1998

DOI:https://doi.org/10.1103/PhysRevD.58.052001

©1998 American Physical Society

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Vol. 58, Iss. 5 — 1 September 1998

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